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1. Cygnus X-3 revealed as a Galactic ultraluminous X-ray source by IXPE

Author

Veledina, Alexandra, Muleri, Fabio, Poutanen, Juri, Podgorný, Jakub, Dovčiak, Michal, Capitanio, Fiamma, Churazov, Eugene, De Rosa, Alessandra, Di Marco, Alessandro, Forsblom, Sofia V., Kaaret, Philip, Krawczynski, Henric, La Monaca, Fabio, Loktev, Vladislav, Lutovinov, Alexander A., Molkov, Sergey V., Mushtukov, Alexander A., Ratheesh, Ajay, Rodriguez Cavero, Nicole, Steiner, James F., Sunyaev, Rashid A., Tsygankov, Sergey S., Weisskopf, Martin C., Zdziarski, Andrzej A., Bianchi, Stefano, Bright, Joe S., Bursov, Nikolaj, Costa, Enrico, Egron, Elise, Garcia, Javier A., Green, David A., Gurwell, Mark, Ingram, Adam, Kajava, Jari J. E., Kale, Ruta, Kraus, Alex, Malyshev, Denys, Marin, Frédéric, Matt, Giorgio, McCollough, Michael, Mereminskiy, Ilya A., Nizhelsky, Nikolaj, Piano, Giovanni, Pilia, Maura, Pittori, Carlotta, Rao, Ramprasad, Righini, Simona, Soffitta, Paolo, Shevchenko, Anton, Svoboda, Jiri, Tombesi, Francesco, Trushkin, Sergei A., Tsybulev, Peter, Ursini, Francesco, Wu, Kinwah, Agudo, Iván, Antonelli, Lucio A., Bachetti, Matteo, Baldini, Luca, Baumgartner, Wayne H., Bellazzini, Ronaldo, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Bucciantini, Niccolò, Castellano, Simone, Cavazzuti, Elisabetta, Chen, Chien-Ting, Ciprini, Stefano, Del Monte, Ettore, Di Gesu, Laura, Di Lalla, Niccolò, Donnarumma, Immacolata, Doroshenko, Victor, Ehlert, Steven R., Enoto, Teruaki, Evangelista, Yuri, Fabiani, Sergio, Ferrazzoli, Riccardo, Gunji, Shuichi, Hayashida, Kiyoshi, Heyl, Jeremy, Iwakiri, Wataru, Jorstad, Svetlana G., Karas, Vladimir, Kislat, Fabian, Kitaguchi, Takao, Kolodziejczak, Jeffery J., Latronico, Luca, Liodakis, Ioannis, Maldera, Simone, Manfreda, Alberto, Marinucci, Andrea, Marscher, Alan P., Marshall, Herman L., Massaro, Francesco, Mitsuishi, Ikuyuki, Mizuno, Tsunefumi, Negro, Michela, Ng, Chi-Yung, O’Dell, Stephen L., Omodei, Nicola, Oppedisano, Chiara, Papitto, Alessandro, Pavlov, George G., Peirson, Abel L., Perri, Matteo, Pesce-Rollins, Melissa, Petrucci, Pierre-Olivier, Possenti, Andrea, Puccetti, Simonetta, Ramsey, Brian D., Rankin, John, Roberts, Oliver, Romani, Roger W., Sgrò, Carmelo, Slane, Patrick, Spandre, Gloria, Swartz, Doug, Tamagawa, Toru, Tavecchio, Fabrizio, Taverna, Roberto, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicholas E., Trois, Alessio, Turolla, Roberto, Vink, Jacco, Xie, Fei, and Zane, Silvia

Published
2024
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2. Magnetic Field Properties inside the Jet of Mrk 421: Multiwavelength Polarimetry Including the Imaging X-ray Polarimetry Explorer

Author

Kim, Dawoon E., Di Gesu, Laura, Liodakis, Ioannis, Marscher, Alan P., Jorstad, Svetlana G., Midde, Riccardo, Marshall, Herman L., Pacciani, Luigi, Agudo, Iván, Tavecchio, Fabrizio, Cibrario, Nicolò, Tugliani, Stefano, Bonino, Raffaella, Negro, Michela, Puccetti, Simonetta, Tombesi, Francesco, Costa, Enrico, Donnarumma, Immacolata, Soffitta, Paolo, Mizuno, Tsunefumi, Fukazawa, Yasushi, Kawabata, Koji S., Nakaoka, Tatsuya, Uemura, Makoto, Imazawa, Ryo, Sasada, Mahito, Akitaya, Hiroshi, Aceituno, Francisco Josè, Bonnoli, Giacomo, Casanova, Vìctor, Myserlis, Ioannis, Sievers, Albrecht, Angelakis, Emmanouil, Kraus, Alexander, Cheong, Whee Yeon, Jeong, Hyeon-Woo, Kang, Sincheol, Kim, Sang-Hyun, Lee, Sang-Sung, Agìs-Gonzàlez, Beatriz, Sota, Alfredo, Escudero, Juan, Gurwell, Mark, Keating, Garrett K., Rao, Ramprasad, Kouch, Pouya M., Lindfors, Elina, Bourbah, Ioakeim G., Kiehlmann, Sebastian, Kontopodis, Evangelos, Mandarakas, Nikos, Romanopoulos, Stylianos, Skalidis, Raphael, Vervelaki, Anna, Savchenko, Sergey S., Antonelli, Lucio A., Bachetti, Matteo, Baldini, Luca, Baumgartner, Wayne H., Bellazzini, Ronaldo, Bianchi, Stefano, Bongiorno, Stephen D., Brez, Alessandro, Bucciantini, Niccolò, Capitanio, Fiamma, Castellano, Simone, Cavazzuti, Elisabetta, Chen, Chien-Ting, Ciprini, Stefano, De Rosa, Alessandra, Del Monte, Ettore, Di Lalla, Niccolò, Di Marco, Alessandro, Doroshenko, Victor, Dovčiak, Michal, Ehlert, Steven R., Enoto, Teruaki, Evangelista, Yuri, Fabiani, Sergio, Ferrazzoli, Riccardo, Garcia, Javier A., Gunji, Shuichi, Hayashida, Kiyoshi, Heyl, Jeremy, Iwakiri, Wataru, Kaaret, Philip, Karas, Vladimir, Kislat, Fabian, Kitaguchi, Takao, Kolodziejczak, Jeffery J., Krawczynski, Henric, La Monaca, Fabio, Latronico, Luca, Maldera, Simone, Manfreda, Alberto, Marin, Frédéric, Marinucci, Andrea, Massaro, Francesco, Matt, Giorgio, Mitsuishi, Ikuyuki, Muleri, Fabio, Ng, C. -Y., O'Dell, Stephen L., Omodei, Nicola, Oppedisano, Chiara, Papitto, Alessandro, Pavlov, George G., Peirson, Abel L., Perri, Matteo, Pesce-Rollins, Melissa, Petrucci, Pierre-Olivier, Pilia, Maura, Possenti, Andrea, Poutanen, Juri, Ramsey, Brian D., Rankin, John, Ratheesh, Ajay, Roberts, Oliver, Romani, Roger W., Sgrò, Carmelo, Slane, Patrick, Spandre, Gloria, Swartz, Doug, Tamagawa, Toru, Taverna, Roberto, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicholas E., Trois, Alessio, Tsygankov, Sergey S., Turolla, Roberto, Vink, Jacco, Weisskopf, Martin C., Wu, Kinwah, Xie, Fei, and Zane, Silvia

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We conducted a polarimetry campaign from radio to X-ray wavelengths of the high-synchrotron-peak (HSP) blazar Mrk 421, including Imaging X-ray Polarimetry Explorer (IXPE) measurements on 2022 December 6-8. We detected X-ray polarization of Mrk 421 with a degree of $\Pi_{\rm X}$=14$\pm$1$\%$ and an electric-vector position angle $\psi_{\rm X}$=107$\pm$3$^{\circ}$ in the 2-8 keV band. From the time variability analysis, we find a significant episodic variation in $\psi_{\rm X}$. During 7 months from the first IXPE pointing of Mrk 421 in 2022 May, $\psi_{\rm X}$ varied across the range of 0$^{\circ}$ to 180$^{\circ}$, while $\Pi_{\rm X}$ maintained similar values within $\sim$10-15$\%$. Furthermore, a swing in $\psi_{\rm X}$ in 2022 June was accompanied by simultaneous spectral variations. The results of the multiwavelength polarimetry show that the X-ray polarization degree was generally $\sim$2-3 times greater than that at longer wavelengths, while the polarization angle fluctuated. Additionally, based on radio, infrared, and optical polarimetry, we find that rotation of $\psi$ occurred in the opposite direction with respect to the rotation of $\psi_{\rm X}$ over longer timescales at similar epochs. The polarization behavior observed across multiple wavelengths is consistent with previous IXPE findings for HSP blazars. This result favors the energy-stratified shock model developed to explain variable emission in relativistic jets. The accompanying spectral variation during the $\psi_{\rm X}$ rotation can be explained by a fluctuation in the physical conditions, e.g., in the energy distribution of relativistic electrons. The opposite rotation direction of $\psi$ between the X-ray and longer-wavelength polarization accentuates the conclusion that the X-ray emitting region is spatially separated from that at longer wavelengths., Comment: 17 pages, 13 figures, 4 tables; Accepted for publication in A&A

Published
2023
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3. Magnetic structures and turbulence in SN 1006 revealed with imaging X-ray polarimetry

Author

Zhou, Ping, Prokhorov, Dmitry, Ferrazzoli, Riccardo, Yang, Yi-Jung, Slane, Patrick, Vink, Jacco, Silvestri, Stefano, Bucciantini, Niccolò, Reynoso, Estela, Moffett, David, Soffitta, Paolo, Swartz, Doug, Kaaret, Philip, Baldini, Luca, Costa, Enrico, Ng, C. -Y., Kim, Dawoon E., Doroshenko, Victor, Ehlert, Steven R., Heyl, Jeremy, Marin, Frédéric, Mizuno, Tsunefumi, Pesce-Rollins, Melissa, Sgrò, Carmelo, Tamagawa, Toru, Weisskopf, Martin C., Xie, Fei, Agudo, Iván, Antonelli, Lucio A., Bachetti, Matteo, Baumgartner, Wayne H., Bellazzini, Ronaldo, Bianchi, Stefano, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Capitanio, Fiamma, Castellano, Simone, Cavazzuti, Elisabetta, Chen, Chien-Ting, Ciprini, Stefano, De Rosa, Alessandra, Del Monte, Ettore, Di Gesu, Laura, Di Lalla, Niccolò, Di Marco, Alessandro, Donnarumma, Immacolata, Dovčiak, Michal, Enoto, Teruaki, Evangelista, Yuri, Fabiani, Sergio, Garcia, Javier A., Gunji, Shuichi, Hayashida, Kiyoshi, Iwakiri, Wataru, Jorstad, Svetlana G., Kislat, Fabian, Karas, Vladimir, Kitaguchi, Takao, Kolodziejczak, Jeffery J., Krawczynski, Henric, La Monaca, Fabio, Latronico, Luca, Liodakis, Ioannis, Maldera, Simone, Manfreda, Alberto, Marinucci, Andrea, Marscher, Alan P., Marshall, Herman L., Matt, Giorgio, Mitsuishi, Ikuyuki, Muleri, Fabio, Negro, Michela, O'Dell, Stephen L., Omodei, Nicola, Oppedisano, Chiara, Papitto, Alessandro, Pavlov, George G., Peirson, Abel L., Perri, Matteo, Petrucci, Pierre-Olivier, Pilia, Maura, Possenti, Andrea, Poutanen, Juri, Puccetti, Simonetta, Ramsey, Brian D., Rankin, John, Ratheesh, Ajay, Roberts, Oliver, Romani, Roger W., Spandre, Gloria, Tavecchio, Fabrizio, Taverna, Roberto, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicholas E., Tombesi, Francesco, Trois, Alessio, Tsygankov, Sergey S., Turolla, Roberto, Wu, Kinwah, and Zane, Silvia

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Young supernova remnants (SNRs) strongly modify surrounding magnetic fields, which in turn play an essential role in accelerating cosmic rays (CRs). X-ray polarization measurements probe magnetic field morphology and turbulence at the immediate acceleration site. We report the X-ray polarization distribution in the northeastern shell of SN1006 from a 1 Ms observation with the Imaging X-ray Polarimetry Explorer (IXPE). We found an average polarization degree of $22.4\pm 3.5\%$ and an average polarization angle of $-45.4\pm 4.5^\circ$ (measured on the plane of the sky from north to east). The X-ray polarization angle distribution reveals that the magnetic fields immediately behind the shock in the northeastern shell of SN 1006 are nearly parallel to the shock normal or radially distributed, similar to that in the radio observations, and consistent with the quasi-parallel CR acceleration scenario. The X-ray emission is marginally more polarized than that in the radio band. The X-ray polarization degree of SN 1006 is much larger than that in Cas A and Tycho, together with the relatively tenuous and smooth ambient medium of the remnant, favoring that CR-induced instabilities set the turbulence in SN 1006 and CR acceleration is environment-dependent., Comment: 15 pages, 4 Figures, 2 Tables; accepted for publication in The Astrophysical Journal

Published
2023

4. X-ray polarization evidence for a 200 years-old flare of Sgr A$^*$

Author

Marin, Frédéric, Churazov, Eugene, Khabibullin, Ildar, Ferrazzoli, Riccardo, Di Gesu, Laura, Barnouin, Thibault, Di Marco, Alessandro, Middei, Riccardo, Vikhlinin, Alexey, Costa, Enrico, Soffitta, Paolo, Muleri, Fabio, Sunyaev, Rashid, Forman, William, Kraft, Ralph, Bianchi, Stefano, Donnarumma, Immacolata, Petrucci, Pierre-Olivier, Enoto, Teruaki, Agudo, Iván, Antonelli, Lucio A., Bachetti, Matteo, Baldini, Luca, Baumgartner, Wayne H., Bellazzini, Ronaldo, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Bucciantini, Niccolò, Capitanio, Fiamma, Castellano, Simone, Cavazzuti, Elisabetta, Chen, Chien-Ting, Ciprini, Stefano, De Rosa, Alessandra, Del Monte, Ettore, Di Lalla, Niccolò, Doroshenko, Victor, Dovciak, Michal, Ehlert, Steven R., Evangelista, Yuri, Fabiani, Sergio, Garcia, Javier A., Gunji, Shuichi, Hayashida, Kiyoshi, Heyl, Jeremy, Ingram, Adam, Iwakiri, Wataru, Jorstad, Svetlana G., Kaaret, Philip, Karas, Vladimir, Kitaguchi, Takao, Kolodziejczak, Jeffery J., Krawczynski, Henric, La Monaca, Fabio, Latronico, Luca, Liodakis, Ioannis, Maldera, Simone, Manfreda, Alberto, Marinucci, Andrea, Marscher, Alan P., Marshall, Herman L., Massaro, Francesco, Matt, Giorgio, Mitsuishi, Ikuyuki, Mizuno, Tsunefumi, Negro, Michela, Ng, C. -Y., O'Dell, Stephen L., Omodei, Nicola, Oppedisano, Chiara, Papitto, Alessandro, Pavlov, George G., Peirson, Abel L., Perri, Matteo, Pesce-Rollins, Melissa, Pilia, Maura, Possenti, Andrea, Poutanen, Juri, Puccetti, Simonetta, Ramsey, Brian D., Rankin, John, Ratheesh, Ajay, Roberts, Oliver J., Romani, Roger W., Sgrò, Carmelo, Slane, Patrick, Spandre, Gloria, Swartz, Doug, Tamagawa, Toru, Tavecchio, Fabrizio, Taverna, Roberto, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicholas E., Tombesi, Francesco, Trois, Alessio, Tsygankov, Sergey S., Turolla, Roberto, Vink, Jacco, Weisskopf, Martin C., Wu, Kinwah, Xie, Fei, and Zane, Silvia

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Astrophysics of Galaxies, J.2.3, J.2.9
Abstract

The center of the Milky Way Galaxy hosts a $\sim$4 million solar mass black hole (Sgr A$^*$) that is currently very quiescent with a luminosity many orders of magnitude below those of active galactic nuclei. Reflection of X-rays from Sgr A$^*$ by dense gas in the Galactic Center region offers a means to study its past flaring activity on times scales of hundreds and thousands of years. The shape of the X-ray continuum and the strong fluorescent iron line observed from giant molecular clouds in the vicinity of Sgr A$^*$ are consistent with the reflection scenario. If this interpretation is correct, the reflected continuum emission should be polarized. Here we report observations of polarized X-ray emission in the direction of the Galactic center molecular clouds using the Imaging X-ray Polarimetry Explorer (IXPE). We measure a polarization degree of 31\% $\pm$ 11\%, and a polarization angle of $-$48$^\circ$ $\pm$ 11$^\circ$. The polarization angle is consistent with Sgr A$^*$ being the primary source of the emission, while the polarization degree implies that some 200 years ago the X-ray luminosity of Sgr A$^*$ was briefly comparable to a Seyfert galaxy., Comment: 24 pages, 5 figures, 4 tables, author's version of the paper accepted for publication in Nature

Published
2023
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5. The first X-ray polarimetric observation of the black hole binary LMC X-1

Author

Podgorny, Jakub, Marra, Lorenzo, Muleri, Fabio, Cavero, Nicole Rodriguez, Ratheesh, Ajay, Dovciak, Michal, Mikusincova, Romana, Brigitte, Maimouna, Steiner, James F., Veledina, Alexandra, Bianchi, Stefano, Krawczynski, Henric, Svoboda, Jiri, Kaaret, Philip, Matt, Giorgio, Garcia, Javier A., Petrucci, Pierre-Olivier, Lutovinov, Alexander A., Semena, Andrey N., Di Marco, Alessandro, Negro, Michela, Weisskopf, Martin C., Ingram, Adam, Poutanen, Juri, Beheshtipour, Banfsheh, Chun, Sohee, Hu, Kun, Mizuno, Tsunefumi, Sixuan, Zhang, Tombesi, Francesco, Zane, Silvia, Agudo, Ivan, Antonelli, Lucio A., Bachetti, Matteo, Baldini, Luca, Baumgartner, Wayne H., Bellazzini, Ronaldo, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Bucciantini, Niccolo, Capitanio, Fiamma, Castellano, Simone, Cavazzuti, Elisabetta, Chen, Chien-Ting, Ciprini, Stefano, Costa, Enrico, De Rosa, Alessandra, Del Monte, Ettore, Di Gesu, Laura, Di Lalla, Niccolo, Donnarumma, Immacolata, Doroshenko, Victor, Ehlert, Steven R., Enoto, Teruaki, Evangelista, Yuri, Fabiani, Sergio, Ferrazzoli, Riccardo, Gunji, Shuichi, Hayashida, Kiyoshi, Heyl, Jeremy, Iwakiri, Wataru, Jorstad, Svetlana G., Karas, Vladimir, Kislat, Fabian, Kitaguchi, Takao, Kolodziejczak, Jeffery J., La Monaca, Fabio, Latronico, Luca, Liodakis, Ioannis, Maldera, Simone, Manfreda, Alberto, Marin, Frederic, Marinucci, Andrea, Marscher, Alan P., Marshall, Herman L., Massaro, Francesco, Mitsuishi, Ikuyuki, Ng, Chi-Yung, O'Dell, Stephen L., Omodei, Nicola, Oppedisano, Chiara, Papitto, Alessandro, Pavlov, George G., Peirson, Abel L., Perri, Matteo, Pesce-Rollins, Melissa, Pilia, Maura, Possenti, Andrea, Puccetti, Simonetta, Ramsey, Brian D., Rankin, John, Roberts, Oliver J., Romani, Roger W., Sgro, Carmelo, Slane, Patrick, Soffitta, Paolo, Spandre, Gloria, Swartz, Doug A., Tamagawa, Toru, Tavecchio, Fabrizio, Taverna, Roberto, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicholas E., Trois, Alessio, Tsygankov, Sergey S., Turolla, Roberto, Vink, Jacco, Wu, Kinwah, and Xie, Fei

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report on an X-ray polarimetric observation of the high-mass X-ray binary LMC X-1 in the high/soft state, obtained by the Imaging X-ray Polarimetry Explorer (IXPE) in October 2022. The measured polarization is below the minimum detectable polarization of 1.1 per cent (at the 99 per cent confidence level). Simultaneously, the source was observed with the NICER, NuSTAR and SRG/ART-XC instruments, which enabled spectral decomposition into a dominant thermal component and a Comptonized one. The low 2-8 keV polarization of the source did not allow for strong constraints on the black-hole spin and inclination of the accretion disc. However, if the orbital inclination of about 36 degrees is assumed, then the upper limit is consistent with predictions for pure thermal emission from geometrically thin and optically thick discs. Assuming the polarization degree of the Comptonization component to be 0, 4, or 10 per cent, and oriented perpendicular to the polarization of the disc emission (in turn assumed to be perpendicular to the large scale ionization cone orientation detected in the optical band), an upper limit to the polarization of the disc emission of 1.0, 0.9 or 0.9 per cent, respectively, is found (at the 99 per cent confidence level)., Comment: 12 pages, 9 figures, 4 tables. Accepted for publication in MNRAS

Published
2023

6. IXPE observations of the quintessential wind-accreting X-ray pulsar Vela X-1

Author

Forsblom, Sofia V., Poutanen, Juri, Tsygankov, Sergey S., Bachetti, Matteo, Di Marco, Alessandro, Doroshenko, Victor, Heyl, Jeremy, La Monaca, Fabio, Malacaria, Christian, Marshall, Herman L., Muleri, Fabio, Mushtukov, Alexander A., Pilia, Maura, Rogantini, Daniele, Suleimanov, Valery F., Taverna, Roberto, Xi, Fei, Agudo, Iván, Antonelli, Lucio A., Baldini, Luca, Baumgartner, Wayne H., Bellazzini, Ronaldo, Bianchi, Stefano, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Bucciantini, Niccolò, Capitanio, Fiamma, Castellano, Simone, Cavazzuti, Elisabetta, Chen, Chien-Ting, Ciprini, Stefano, Costa, Enrico, De Rosa, Alessandra, Del Monte, Ettore, Di Gesu, Laura, Di Lalla, Niccolò, Donnarumma, Immacolata, Dovčiak, Michal, Ehlert, Steven R., Enoto, Teruaki, Evangelista, Yuri, Fabiani, Sergio, Ferrazzoli, Riccardo, Garcia, Javier A., Gunji, Shuichi, Hayashida, Kiyoshi, Iwakiri, Wataru, Jorstad, Svetlana G., Kaaret, Philip, Karas, Vladimir, Kitaguchi, Takao, Kolodziejczak, Jeffery J., Krawczynski, Henric, Latronico, Luca, Liodakis, Ioannis, Maldera, Simone, Manfreda, Alberto, Marin, Frédéric, Marinucci, Andrea, Marscher, Alan P., Matt, Giorgio, Mitsuishi, Ikuyuki, Mizuno, Tsunefumi, Negro, Michela, Ng, Chi-Yung, O'Dell, Stephen L., Omodei, Nicola, Oppedisano, Chiara, Papitto, Alessandro, Pavlov, George G., Peirson, Abel L., Perri, Matteo, Pesce-Rollins, Melissa, Petrucci, Pierre-Olivier, Possenti, Andrea, Puccetti, Simonetta, Ramsey, Brian D., Rankin, John, Ratheesh, Ajay, Roberts, Oliver J., Romani, Roger W., Sgrò, Carmelo, Slane, Patrick, Soffitta, Paolo, Spandre, Gloria, Sunyaev, Rashid A., Swartz, Doug, Tamagawa, Toru, Tavecchio, Fabrizio, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicholas E., Tombesi, Francesco, Trois, Alessio, Turolla, Roberto, Vink, Jacco, Weisskopf, Martin C., Wu, Kinwah, and Zane, Silvia

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The radiation from accreting X-ray pulsars was expected to be highly polarized, with some estimates for the polarization degree of up to 80%. However, phase-resolved and energy-resolved polarimetry of X-ray pulsars is required in order to test different models and to shed light on the emission processes and the geometry of the emission region. Here we present the first results of the observations of the accreting X-ray pulsar Vela X-1 performed with the Imaging X-ray Polarimetry Explorer (IXPE). Vela X-1 is considered to be the archetypal example of a wind-accreting high-mass X-ray binary system, consisting of a highly magnetized neutron star accreting matter from its supergiant stellar companion. The spectro-polarimetric analysis of the phase-averaged data for Vela X-1 reveals a polarization degree (PD) of 2.3$\pm$0.4% at the polarization angle (PA) of -47.3$\pm$5.4 deg. A low PD is consistent with the results obtained for other X-ray pulsars and is likely related to the inverse temperature structure of the neutron star atmosphere. The energy-resolved analysis shows the PD above 5 keV reaching 6-10%, and a 90 deg difference in the PA compared to the data in the 2-3 keV range. The phase-resolved spectro-polarimetric analysis finds a PD in the range 0-9% with the PA varying between -80 and 40 deg., Comment: 12 pages, 7 figures, ApJ Letters, submitted

Published
2023
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7. Cygnus X-3 revealed as a Galactic ultraluminous X-ray source by IXPE

Author

Veledina, Alexandra, Muleri, Fabio, Poutanen, Juri, Podgorný, Jakub, Dovčiak, Michal, Capitanio, Fiamma, Churazov, Eugene, De Rosa, Alessandra, Di Marco, Alessandro, Forsblom, Sofia, Kaaret, Philip, Krawczynski, Henric, La Monaca, Fabio, Loktev, Vladislav, Lutovinov, Alexander A., Molkov, Sergey V., Mushtukov, Alexander A., Ratheesh, Ajay, Cavero, Nicole Rodriguez, Steiner, James F., Sunyaev, Rashid A., Tsygankov, Sergey S., Zdziarski, Andrzej A., Bianchi, Stefano, Bright, Joe S., Bursov, Nikolaj, Costa, Enrico, Egron, Elise, Garcia, Javier A., Green, David A., Gurwell, Mark, Ingram, Adam, Kajava, Jari J. E., Kale, Ruta, Kraus, Alex, Malyshev, Denys, Marin, Frédéric, Matt, Giorgio, McCollough, Michael, Mereminskiy, Ilia A., Nizhelsky, Nikolaj, Piano, Giovanni, Pilia, Maura, Pittori, Carlotta, Rao, Ramprasad, Righini, Simona, Soffitta, Paolo, Shevchenko, Anton, Svoboda, Jiri, Tombesi, Francesco, Trushkin, Sergei, Tsybulev, Peter, Ursini, Francesco, Weisskopf, Martin C., Wu, Kinwah, Agudo, Iván, Antonelli, Lucio A., Bachetti, Matteo, Baldini, Luca, Baumgartner, Wayne H., Bellazzini, Ronaldo, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Bucciantini, Niccolò, Castellano, Simone, Cavazzuti, Elisabetta, Chen, Chien-Ting, Ciprini, Stefano, Del Monte, Ettore, Di Gesu, Laura, Di Lalla, Niccolò, Donnarumma, Immacolata, Doroshenko, Victor, Ehlert, Steven R., Enoto, Teruaki, Evangelista, Yuri, Fabiani, Sergio, Ferrazzoli, Riccardo, Gunji, Shuichi, Hayashida, Kiyoshi, Heyl, Jeremy, Iwakiri, Wataru, Jorstad, Svetlana G., Karas, Vladimir, Kislat, Fabian, Kitaguchi, Takao, Kolodziejczak, Jeffery J., Latronico, Luca, Liodakis, Ioannis, Maldera, Simone, Manfreda, Alberto, Marinucci, Andrea, Marscher, Alan P., Marshall, Herman L., Massaro, Francesco, Mitsuishi, Ikuyuki, Mizuno, Tsunefumi, Negro, Michela, Ng, Chi-Yung, O'Dell, Stephen L., Omodei, Nicola, Oppedisano, Chiara, Papitto, Alessandro, Pavlov, George G., Peirson, Abel L., Perri, Matteo, Pesce-Rollins, Melissa, Petrucci, Pierre-Olivier, Possenti, Andrea, Puccetti, Simonetta, Ramsey, Brian D., Rankin, John, Roberts, Oliver, Romani, Roger W., Sgrò, Carmelo, Slane, Patrick, Spandre, Gloria, Swartz, Doug, Tamagawa, Toru, Tavecchio, Fabrizio, Taverna, Roberto, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicholas E., Trois, Alessio, Turolla, Roberto, Vink, Jacco, Xie, Fei, and Zane, Silvia

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics
Abstract

The accretion of matter by compact objects can be inhibited by radiation pressure if the luminosity exceeds the critical value, known as the Eddington limit. Discovery of ultraluminous X-ray sources has shown that accretion can proceed even when the apparent luminosity significantly exceeds this limit. High apparent luminosity might be produced thanks to geometric beaming of the radiation by an outflow. The outflow half-opening angle, which determines the amplification due to beaming, has never been robustly constrained. Using the Imaging X-ray Polarimetry Explorer, we made the measurement of X-ray polarization in the Galactic X-ray binary Cyg X-3. We find high, over 20%, nearly energy-independent linear polarization, orthogonal to the direction of the radio ejections. These properties unambiguously indicate the presence of a collimating outflow in the X-ray binary Cyg~X-3 and constrain its half-opening angle, <15 degrees. Thus, the source can be used as a laboratory for studying the super-critical accretion regime. This finding underscores the importance of X-ray polarimetry in advancing our understanding of accreting sources., Comment: 52 pages, 14 figures, 3 tables. Author version of the article published in Nature Astronomy

Published
2023
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8. A Probabilistic Method of Background Removal for High Energy Astrophysics Data

Author

Ehlert, Steven, Chen, Chien-Ting, Swartz, Doug A., Hickox, Ryan C., Lutovinov, Alexander A., Semena, Andrey N., Krivonos, Roman, Shtykovsky, Andrey E., and Tkachenko, Alexey

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present a new statistical method for constructing background subtracted measurements from event list data gathered by X-ray and gamma ray observatories. This method was initially developed specifically to construct images that account for the high background fraction and low overall count rates observed in survey data from the Mikhail Pavlinsky ART-XC telescope aboard the Spektrum R\"{o}ntgen Gamma (SRG) mission, although the mathematical underpinnings are valid for data taken with other imaging missions and analysis applications. This method fully accounts for the expected Poisson fluctuations in both the sky photon and non X-ray background count rates in a manner that does not result in unphysical negative counts. We derive the formulae for arbitrary confidence intervals for the source counts and show that our new measurement converges exactly to the standard background subtraction calculation in the high signal limit. Utilizing these results, we discuss several variants of images designed to optimize different science goals for both pointed and slewing telescopes. Using realistic simulated data of a galaxy cluster as observed by ART-XC we show that our method provides a more significant and robust detection of the cluster emission as compared to a standard background subtraction. We also demonstrate its advantages using real observations of a point source from the ART-XC telescope. These calculations may have widespread applications for a number of source classes observed with high energy telescopes., Comment: 15 pages, 9 figures, Accepted for Publication in MNRAS

Published
2022
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9. Simultaneous space and phase resolved X-ray polarimetry of the Crab pulsar and nebula

Author

Bucciantini, Niccolò, Ferrazzoli, Riccardo, Bachetti, Matteo, Rankin, John, Di Lalla, Niccolò, Sgrò, Carmelo, Omodei, Nicola, Kitaguchi, Takao, Mizuno, Tsunefumi, Gunji, Shuichi, Watanabe, Eri, Baldini, Luca, Slane, Patrick, Weisskopf, Martin C., Romani, Roger W., Possenti, Andrea, Marshall, Herman L., Silvestri, Stefano, Pacciani, Luigi, Negro, Michela, Muleri, Fabio, de Oña Wilhelmi, Emma, Xie, Fei, Heyl, Jeremy, Pesce-Rollins, Melissa, Wong, Josephine, Pilia, Maura, Agudo, Iván, Antonelli, Lucio A., Baumgartner, Wayne H., Bellazzini, Ronaldo, Bianchi, Stefano, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Capitanio, Fiamma, Castellano, Simone, Cavazzuti, Elisabetta, Chen, Chien-Ting, Ciprini, Stefano, Costa, Enrico, De Rosa, Alessandra, Del Monte, Ettore, Di Gesu, Laura, Di Marco, Alessandro, Donnarumma, Immacolata, Doroshenko, Victor, Dovčiak, Michal, Ehlert, Steven R., Enoto, Teruaki, Evangelista, Yuri, Fabiani, Sergio, Garcia, Javier A., Hayashida, Kiyoshi, Iwakiri, Wataru, Jorstad, Svetlana G., Kaaret, Philip, Karas, Vladimir, Kislat, Fabian, Kolodziejczak, Jeffery J., Krawczynski, Henric, La Monaca, Fabio, Latronico, Luca, Liodakis, Ioannis, Maldera, Simone, Manfreda, Alberto, Marin, Frédéric, Marinucci, Andrea, Marscher, Alan P., Massaro, Francesco, Matt, Giorgio, Mitsuishi, Ikuyuki, Ng, C.-Y., O’Dell, Stephen L., Oppedisano, Chiara, Papitto, Alessandro, Pavlov, George G., Peirson, Abel L., Perri, Matteo, Petrucci, Pierre-Olivier, Poutanen, Juri, Puccetti, Simonetta, Ramsey, Brian D., Ratheesh, Ajay, Roberts, Oliver J., Soffitta, Paolo, Spandre, Gloria, Swartz, Doug, Tamagawa, Toru, Tavecchio, Fabrizio, Taverna, Roberto, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicolas E., Tombesi, Francesco, Trois, Alessio, Tsygankov, Sergey, Turolla, Roberto, Vink, Jacco, Wu, Kinwah, and Zane, Silvia

Published
2023
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10. Magnetic field properties inside the jet of Mrk 421

Author

Kim, Dawoon E., primary, Di Gesu, Laura, additional, Liodakis, Ioannis, additional, Marscher, Alan P., additional, Jorstad, Svetlana G., additional, Middei, Riccardo, additional, Marshall, Herman L., additional, Pacciani, Luigi, additional, Agudo, Iván, additional, Tavecchio, Fabrizio, additional, Cibrario, Nicoló, additional, Tugliani, Stefano, additional, Bonino, Raffaella, additional, Negro, Michela, additional, Puccetti, Simonetta, additional, Tombesi, Francesco, additional, Costa, Enrico, additional, Donnarumma, Immacolata, additional, Soffitta, Paolo, additional, Mizuno, Tsunefumi, additional, Fukazawa, Yasushi, additional, Kawabata, Koji S., additional, Nakaoka, Tatsuya, additional, Uemura, Makoto, additional, Imazawa, Ryo, additional, Sasada, Mahito, additional, Akitaya, Hiroshi, additional, Josè Aceituno, Francisco, additional, Bonnoli, Giacomo, additional, Casanova, Vìctor, additional, Myserlis, Ioannis, additional, Sievers, Albrecht, additional, Angelakis, Emmanouil, additional, Kraus, Alexander, additional, Yeon Cheong, Whee, additional, Jeong, Hyeon-Woo, additional, Kang, Sincheol, additional, Kim, Sang-Hyun, additional, Lee, Sang-Sung, additional, Agìs-Gonzàlez, Beatriz, additional, Sota, Alfredo, additional, Escudero, Juan, additional, Gurwell, Mark, additional, Keating, Garrett K., additional, Rao, Ramprasad, additional, Kouch, Pouya M., additional, Lindfors, Elina, additional, Bourbah, Ioakeim G., additional, Kiehlmann, Sebastian, additional, Kontopodis, Evangelos, additional, Mandarakas, Nikos, additional, Romanopoulos, Stylianos, additional, Skalidis, Raphael, additional, Vervelaki, Anna, additional, Savchenko, Sergey S., additional, Antonelli, Lucio A., additional, Bachetti, Matteo, additional, Baldini, Luca, additional, Baumgartner, Wayne H., additional, Bellazzini, Ronaldo, additional, Bianchi, Stefano, additional, Bongiorno, Stephen D., additional, Brez, Alessandro, additional, Bucciantini, Niccoló, additional, Capitanio, Fiamma, additional, Castellano, Simone, additional, Cavazzuti, Elisabetta, additional, Chen, Chien-Ting, additional, Ciprini, Stefano, additional, De Rosa, Alessandra, additional, Del Monte, Ettore, additional, Di Lalla, Niccoló, additional, Di Marco, Alessandro, additional, Doroshenko, Victor, additional, Dovčiak, Michal, additional, Ehlert, Steven R., additional, Enoto, Teruaki, additional, Evangelista, Yuri, additional, Fabiani, Sergio, additional, Ferrazzoli, Riccardo, additional, Garcia, Javier A., additional, Gunji, Shuichi, additional, Hayashida, Kiyoshi, additional, Heyl, Jeremy, additional, Iwakiri, Wataru, additional, Kaaret, Philip, additional, Karas, Vladimir, additional, Kislat, Fabian, additional, Kitaguchi, Takao, additional, Kolodziejczak, Jeffery J., additional, Krawczynski, Henric, additional, La Monaca, Fabio, additional, Latronico, Luca, additional, Maldera, Simone, additional, Manfreda, Alberto, additional, Marin, Frédéric, additional, Marinucci, Andrea, additional, Massaro, Francesco, additional, Matt, Giorgio, additional, Mitsuishi, Ikuyuki, additional, Muleri, Fabio, additional, Ng, C.-Y., additional, O’Dell, Stephen L., additional, Omodei, Nicola, additional, Oppedisano, Chiara, additional, Papitto, Alessandro, additional, Pavlov, George G., additional, Peirson, Abel L., additional, Perri, Matteo, additional, Pesce-Rollins, Melissa, additional, Petrucci, Pierre-Olivier, additional, Pilia, Maura, additional, Possenti, Andrea, additional, Poutanen, Juri, additional, Ramsey, Brian D., additional, Rankin, John, additional, Ratheesh, Ajay, additional, Roberts, Oliver, additional, Romani, Roger W., additional, Sgró, Carmelo, additional, Slane, Patrick, additional, Spandre, Gloria, additional, Swartz, Doug, additional, Tamagawa, Toru, additional, Taverna, Roberto, additional, Tawara, Yuzuru, additional, Tennant, Allyn F., additional, Thomas, Nicholas E., additional, Trois, Alessio, additional, Tsygankov, Sergey S., additional, Turolla, Roberto, additional, Vink, Jacco, additional, Weisskopf, Martin C., additional, Wu, Kinwah, additional, Xie, Fei, additional, and Zane, Silvia, additional

Published
2024
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11. Magnetic Structures and Turbulence in SN 1006 Revealed with Imaging X-Ray Polarimetry

Author

Zhou, Ping, primary, Prokhorov, Dmitry, additional, Ferrazzoli, Riccardo, additional, Yang, Yi-Jung, additional, Slane, Patrick, additional, Vink, Jacco, additional, Silvestri, Stefano, additional, Bucciantini, Niccolò, additional, Reynoso, Estela, additional, Moffett, David, additional, Soffitta, Paolo, additional, Swartz, Doug, additional, Kaaret, Philip, additional, Baldini, Luca, additional, Costa, Enrico, additional, Ng, C.-Y., additional, Kim, Dawoon E., additional, Doroshenko, Victor, additional, Ehlert, Steven R., additional, Heyl, Jeremy, additional, Marin, Frédéric, additional, Mizuno, Tsunefumi, additional, Pesce-Rollins, Melissa, additional, Sgrò, Carmelo, additional, Tamagawa, Toru, additional, Weisskopf, Martin C., additional, Xie, Fei, additional, Agudo, Iván, additional, Antonelli, Lucio A., additional, Bachetti, Matteo, additional, Baumgartner, Wayne H., additional, Bellazzini, Ronaldo, additional, Bianchi, Stefano, additional, Bongiorno, Stephen D., additional, Bonino, Raffaella, additional, Brez, Alessandro, additional, Capitanio, Fiamma, additional, Castellano, Simone, additional, Cavazzuti, Elisabetta, additional, Chen, Chien-Ting, additional, Ciprini, Stefano, additional, De Rosa, Alessandra, additional, Del Monte, Ettore, additional, Di Gesu, Laura, additional, Di Lalla, Niccolò, additional, Di Marco, Alessandro, additional, Donnarumma, Immacolata, additional, Dovčiak, Michal, additional, Enoto, Teruaki, additional, Evangelista, Yuri, additional, Fabiani, Sergio, additional, Garcia, Javier A., additional, Gunji, Shuichi, additional, Hayashida, Kiyoshi, additional, Iwakiri, Wataru, additional, Jorstad, Svetlana G., additional, Kislat, Fabian, additional, Karas, Vladimir, additional, Kitaguchi, Takao, additional, Kolodziejczak, Jeffery J., additional, Krawczynski, Henric, additional, La Monaca, Fabio, additional, Latronico, Luca, additional, Liodakis, Ioannis, additional, Maldera, Simone, additional, Manfreda, Alberto, additional, Marinucci, Andrea, additional, Marscher, Alan P., additional, Marshall, Herman L., additional, Matt, Giorgio, additional, Mitsuishi, Ikuyuki, additional, Muleri, Fabio, additional, Negro, Michela, additional, O’Dell, Stephen L., additional, Omodei, Nicola, additional, Oppedisano, Chiara, additional, Papitto, Alessandro, additional, Pavlov, George G., additional, Peirson, Abel L., additional, Perri, Matteo, additional, Petrucci, Pierre-Olivier, additional, Pilia, Maura, additional, Possenti, Andrea, additional, Poutanen, Juri, additional, Puccetti, Simonetta, additional, Ramsey, Brian D., additional, Rankin, John, additional, Ratheesh, Ajay, additional, Roberts, Oliver, additional, Romani, Roger W., additional, Spandre, Gloria, additional, Tavecchio, Fabrizio, additional, Taverna, Roberto, additional, Tawara, Yuzuru, additional, Tennant, Allyn F., additional, Thomas, Nicholas E., additional, Tombesi, Francesco, additional, Trois, Alessio, additional, Tsygankov, Sergey S., additional, Turolla, Roberto, additional, Wu, Kinwah, additional, and Zane, Silvia, additional

Published
2023
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12. X-ray polarization evidence for a 200-year-old flare of Sgr A*

Author

Marin, Frédéric, primary, Churazov, Eugene, additional, Khabibullin, Ildar, additional, Ferrazzoli, Riccardo, additional, Di Gesu, Laura, additional, Barnouin, Thibault, additional, Di Marco, Alessandro, additional, Middei, Riccardo, additional, Vikhlinin, Alexey, additional, Costa, Enrico, additional, Soffitta, Paolo, additional, Muleri, Fabio, additional, Sunyaev, Rashid, additional, Forman, William, additional, Kraft, Ralph, additional, Bianchi, Stefano, additional, Donnarumma, Immacolata, additional, Petrucci, Pierre-Olivier, additional, Enoto, Teruaki, additional, Agudo, Iván, additional, Antonelli, Lucio A., additional, Bachetti, Matteo, additional, Baldini, Luca, additional, Baumgartner, Wayne H., additional, Bellazzini, Ronaldo, additional, Bongiorno, Stephen D., additional, Bonino, Raffaella, additional, Brez, Alessandro, additional, Bucciantini, Niccolò, additional, Capitanio, Fiamma, additional, Castellano, Simone, additional, Cavazzuti, Elisabetta, additional, Chen, Chien-Ting, additional, Ciprini, Stefano, additional, De Rosa, Alessandra, additional, Del Monte, Ettore, additional, Di Lalla, Niccolò, additional, Doroshenko, Victor, additional, Dovčiak, Michal, additional, Ehlert, Steven R., additional, Evangelista, Yuri, additional, Fabiani, Sergio, additional, Garcia, Javier A., additional, Gunji, Shuichi, additional, Hayashida, Kiyoshi, additional, Heyl, Jeremy, additional, Ingram, Adam, additional, Iwakiri, Wataru, additional, Jorstad, Svetlana G., additional, Kaaret, Philip, additional, Karas, Vladimir, additional, Kitaguchi, Takao, additional, Kolodziejczak, Jeffery J., additional, Krawczynski, Henric, additional, La Monaca, Fabio, additional, Latronico, Luca, additional, Liodakis, Ioannis, additional, Maldera, Simone, additional, Manfreda, Alberto, additional, Marinucci, Andrea, additional, Marscher, Alan P., additional, Marshall, Herman L., additional, Massaro, Francesco, additional, Matt, Giorgio, additional, Mitsuishi, Ikuyuki, additional, Mizuno, Tsunefumi, additional, Negro, Michela, additional, Ng, C.-Y., additional, O’Dell, Stephen L., additional, Omodei, Nicola, additional, Oppedisano, Chiara, additional, Papitto, Alessandro, additional, Pavlov, George G., additional, Peirson, Abel L., additional, Perri, Matteo, additional, Pesce-Rollins, Melissa, additional, Pilia, Maura, additional, Possenti, Andrea, additional, Poutanen, Juri, additional, Puccetti, Simonetta, additional, Ramsey, Brian D., additional, Rankin, John, additional, Ratheesh, Ajay, additional, Roberts, Oliver J., additional, Romani, Roger W., additional, Sgrò, Carmelo, additional, Slane, Patrick, additional, Spandre, Gloria, additional, Swartz, Doug, additional, Tamagawa, Toru, additional, Tavecchio, Fabrizio, additional, Taverna, Roberto, additional, Tawara, Yuzuru, additional, Tennant, Allyn F., additional, Thomas, Nicholas E., additional, Tombesi, Francesco, additional, Trois, Alessio, additional, Tsygankov, Sergey S., additional, Turolla, Roberto, additional, Vink, Jacco, additional, Weisskopf, Martin C., additional, Wu, Kinwah, additional, Xie, Fei, additional, and Zane, Silvia, additional

Published
2023
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13. X-ray Polarization Reveals the Precessions of the Neutron Star in Hercules X-1

Author

Heyl, Jeremy, primary, Doroshenko, Victor, additional, González-Caniulef, Denis, additional, Caiazzo, Ilaria, additional, Poutanen, Juri, additional, Mushtukov, Alexander, additional, Tsygankov, Sergey, additional, Kirmizibayrak, Demet, additional, Bachetti, Matteo, additional, Pavlov, George, additional, Agudo, Iván, additional, Antonelli, Lucio, additional, Baldini, Luca, additional, Baumgartner, Wayne, additional, Bellazzini, Ronaldo, additional, Bianchi, Stefano, additional, Bongiorno, Stephen, additional, Bonino, Raffaella, additional, Brez, Alessandro, additional, Bucciantini, Niccolò, additional, Capitanio, Fiamma, additional, Castellano, Simone, additional, Cavazzuti, Elisabetta, additional, Chen, Chien-Ting, additional, Ciprini, Stefano, additional, Costa, Enrico, additional, De Rosa, Alessandra, additional, Monte, Ettore Del, additional, Gesu, Laura Di, additional, Lalla, Niccolo Di, additional, Marco, Alessandro Di, additional, Donnarumma, Immacolata, additional, Dovciak, Michal, additional, Ehlert, Steven, additional, Enoto, Teruaki, additional, Evangelista, Yuri, additional, Fabiani, Sergio, additional, Ferrazzoli, Riccardo, additional, Garcia, Javier, additional, Gunji, Shuichi, additional, Iwakiri, Wataru, additional, Jorstad, Svetlana, additional, Kaaret, Philip, additional, Karas, Vladimir, additional, Kislat, Fabian, additional, Kitaguchi, Takao, additional, Kolodziejczak, Jeffery, additional, Krawczynski, Henric, additional, Monaca, Fabio La, additional, Latronico, Luca, additional, Liodakis, Ioannis, additional, Maldera, Simone, additional, Manfreda, Alberto, additional, Marin, Frederic, additional, Marinucci, Andrea, additional, Marscher, Alan, additional, Marshall, Herman, additional, Massaro, Francesco, additional, Matt, Giorgio, additional, Mitsuishi, Ikuyuki, additional, Mizuno, Tsunefumi, additional, Muleri, Fabio, additional, Negro, Michela, additional, Ng, C.-Y., additional, O'Dell, Stephen, additional, Omodei, Nicola, additional, Oppedisano, Chiara, additional, Papitto, Alessandro, additional, Peirson, Abel, additional, Perri, Matteo, additional, Pesce-Rollins, Melissa, additional, Petrucci, Pierre-Olivier, additional, Pilia, Maura, additional, Possenti, Andrea, additional, Puccetti, Simonetta, additional, Ramsey, Brian, additional, Rankin, John, additional, Ratheesh, Ajay, additional, Roberts, Oliver, additional, Romani, Roger, additional, Sgro, Carmelo, additional, Slane, Patrick, additional, Soffitta, Paolo, additional, Spandre, Gloria, additional, Swartz, Doug, additional, Tamagawa, Toru, additional, Tavecchio, Fabrizio, additional, Taverna, Roberto, additional, Tawara, Yuzuru, additional, Tennant, Allyn, additional, Thomas, Nicholas, additional, Tombesi, Francesco, additional, Trois, Alessio, additional, Turolla, Roberto, additional, Vink, Jacco, additional, Weisskopf, Martin, additional, Wu, Kinwah, additional, Xie, Fei, additional, and Zane, Silvia, additional

Published
2023
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14. Astronomical puzzle Cyg X-3 is a hidden Galactic ultraluminous X-ray source

Author

Veledina, Alexandra, Muleri, Fabio, Poutanen, Juri, Podgorný, Jakub, Dovčiak, Michal, Capitanio, Fiamma, Churazov, Eugene, De Rosa, Alessandra, Di Marco, Alessandro, Forsblom, Sofia, Kaaret, Philip, Krawczynski, Henric, La Monaca, Fabio, Loktev, Vladislav, Lutovinov, Alexander A., Molkov, Sergey V., Mushtukov, Alexander A., Ratheesh, Ajay, Cavero, Nicole Rodriguez, Steiner, James F., Sunyaev, Rashid A., Tsygankov, Sergey S., Zdziarski, Andrzej A., Bianchi, Stefano, Bright, Joe S., Bursov, Nikolaj, Costa, Enrico, Egron, Elise, Garcia, Javier A., Green, David A., Gurwell, Mark, Ingram, Adam, Kajava, Jari J. E., Kale, Ruta, Kraus, Alex, Malyshev, Denys, Marin, Frédéric, Matt, Giorgio, McCollough, Michael, Mereminskiy, Ilia A., Nizhelsky, Nikolaj, Piano, Giovanni, Pilia, Maura, Pittori, Carlotta, Rao, Ramprasad, Righini, Simona, Soffitta, Paolo, Shevchenko, Anton, Svoboda, Jiri, Tombesi, Francesco, Trushkin, Sergei, Tsybulev, Peter, Ursini, Francesco, Weisskopf, Martin C., Wu, Kinwah, Agudo, Iván, Antonelli, Lucio A., Bachetti, Matteo, Baldini, Luca, Baumgartner, Wayne H., Bellazzini, Ronaldo, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Bucciantini, Niccolò, Castellano, Simone, Cavazzuti, Elisabetta, Chen, Chien-Ting, Ciprini, Stefano, Del Monte, Ettore, Di Gesu, Laura, Di Lalla, Niccolò, Donnarumma, Immacolata, Doroshenko, Victor, Ehlert, Steven R., Enoto, Teruaki, Evangelista, Yuri, Fabiani, Sergio, Ferrazzoli, Riccardo, Gunji, Shuichi, Hayashida, Kiyoshi, Heyl, Jeremy, Iwakiri, Wataru, Jorstad, Svetlana G., Karas, Vladimir, Kislat, Fabian, Kitaguchi, Takao, Kolodziejczak, Jeffery J., Latronico, Luca, Liodakis, Ioannis, Maldera, Simone, Manfreda, Alberto, Marinucci, Andrea, Marscher, Alan P., Marshall, Herman L., Massaro, Francesco, Mitsuishi, Ikuyuki, Mizuno, Tsunefumi, Negro, Michela, Ng, Chi-Yung, O'Dell, Stephen L., Omodei, Nicola, Oppedisano, Chiara, Papitto, Alessandro, Pavlov, George G., Peirson, Abel L., Perri, Matteo, Pesce-Rollins, Melissa, Petrucci, Pierre-Olivier, Possenti, Andrea, Puccetti, Simonetta, Ramsey, Brian D., Rankin, John, Roberts, Oliver, Romani, Roger W., Sgrò, Carmelo, Slane, Patrick, Spandre, Gloria, Swartz, Doug, Tamagawa, Toru, Tavecchio, Fabrizio, Taverna, Roberto, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicholas E., Trois, Alessio, Turolla, Roberto, Vink, Jacco, Xie, Fei, Zane, Silvia, Veledina, Alexandra, Muleri, Fabio, Poutanen, Juri, Podgorný, Jakub, Dovčiak, Michal, Capitanio, Fiamma, Churazov, Eugene, De Rosa, Alessandra, Di Marco, Alessandro, Forsblom, Sofia, Kaaret, Philip, Krawczynski, Henric, La Monaca, Fabio, Loktev, Vladislav, Lutovinov, Alexander A., Molkov, Sergey V., Mushtukov, Alexander A., Ratheesh, Ajay, Cavero, Nicole Rodriguez, Steiner, James F., Sunyaev, Rashid A., Tsygankov, Sergey S., Zdziarski, Andrzej A., Bianchi, Stefano, Bright, Joe S., Bursov, Nikolaj, Costa, Enrico, Egron, Elise, Garcia, Javier A., Green, David A., Gurwell, Mark, Ingram, Adam, Kajava, Jari J. E., Kale, Ruta, Kraus, Alex, Malyshev, Denys, Marin, Frédéric, Matt, Giorgio, McCollough, Michael, Mereminskiy, Ilia A., Nizhelsky, Nikolaj, Piano, Giovanni, Pilia, Maura, Pittori, Carlotta, Rao, Ramprasad, Righini, Simona, Soffitta, Paolo, Shevchenko, Anton, Svoboda, Jiri, Tombesi, Francesco, Trushkin, Sergei, Tsybulev, Peter, Ursini, Francesco, Weisskopf, Martin C., Wu, Kinwah, Agudo, Iván, Antonelli, Lucio A., Bachetti, Matteo, Baldini, Luca, Baumgartner, Wayne H., Bellazzini, Ronaldo, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Bucciantini, Niccolò, Castellano, Simone, Cavazzuti, Elisabetta, Chen, Chien-Ting, Ciprini, Stefano, Del Monte, Ettore, Di Gesu, Laura, Di Lalla, Niccolò, Donnarumma, Immacolata, Doroshenko, Victor, Ehlert, Steven R., Enoto, Teruaki, Evangelista, Yuri, Fabiani, Sergio, Ferrazzoli, Riccardo, Gunji, Shuichi, Hayashida, Kiyoshi, Heyl, Jeremy, Iwakiri, Wataru, Jorstad, Svetlana G., Karas, Vladimir, Kislat, Fabian, Kitaguchi, Takao, Kolodziejczak, Jeffery J., Latronico, Luca, Liodakis, Ioannis, Maldera, Simone, Manfreda, Alberto, Marinucci, Andrea, Marscher, Alan P., Marshall, Herman L., Massaro, Francesco, Mitsuishi, Ikuyuki, Mizuno, Tsunefumi, Negro, Michela, Ng, Chi-Yung, O'Dell, Stephen L., Omodei, Nicola, Oppedisano, Chiara, Papitto, Alessandro, Pavlov, George G., Peirson, Abel L., Perri, Matteo, Pesce-Rollins, Melissa, Petrucci, Pierre-Olivier, Possenti, Andrea, Puccetti, Simonetta, Ramsey, Brian D., Rankin, John, Roberts, Oliver, Romani, Roger W., Sgrò, Carmelo, Slane, Patrick, Spandre, Gloria, Swartz, Doug, Tamagawa, Toru, Tavecchio, Fabrizio, Taverna, Roberto, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicholas E., Trois, Alessio, Turolla, Roberto, Vink, Jacco, Xie, Fei, and Zane, Silvia

Abstract

How black holes consume and eject matter has been the subject of intense studies for more than 60 years. The luminosity of these systems are often compared to the Eddington limit, the border at which the spherical accretion is inhibited by the radiation pressure of photons it produces. The discovery of ultraluminous X-ray sources (ULXs) showed that accretion can proceed even when the apparent luminosity exceeds the Eddington limit (Kaaret et al. 2017). High apparent luminosity might be produced by the beaming of the incident radiation by a thick collimated outflow or by a truly super-Eddington accretion flow. However, possibilities to study these outflows in detail are limited, as ULXs are typically found in distant galaxies. Using the Imaging X-ray Polarimetry Explorer (IXPE, Weisskopf et al. 2022), we made the first measurement of X-ray polarization in Galactic X-ray binary Cyg X-3. The detection of high, $\approx$25\%, nearly energy-independent linear polarization, orthogonal to the direction of the radio ejections, unambiguously indicates the primary source is obscured and the observer on Earth only sees reflected and scattered light. Modelling shows there is an optically thick envelope with a narrow funnel around the primary X-ray source in the system. We derive an upper limit on the opening angle of the funnel that implies a lower limit on the beamed luminosity exceeding the Eddington value. We show that Cyg X-3 is viewed as a ULX to an extragalactic observer located along the axis of the funnel. Our findings reveal this unique persistent source as an ideal laboratory for the study of the inner workings of ULX central engines., Comment: 52 pages, 18 figures, 4 tables

Published
2023

15. When the Milky Way hosted a quasar

Author

Marin, Frederic, primary, Churazov, Eugene, additional, Khabibullin, Ildar, additional, Ferrazzoli, Riccardo, additional, Gesu, Laura Di, additional, Barnouin, Thibault, additional, Marco, Alessandro Di, additional, Middei, Riccardo, additional, Vikhlinin, Alexey, additional, Costa, Enrico, additional, Soffitta, Paolo, additional, Muleri, Fabio, additional, Sunyaev, Rashid, additional, Forman, William, additional, Kraft, Ralph, additional, Bianchi, Stefano, additional, Donnarumma, Immacolata, additional, Petrucci, Pierre-Olivier, additional, Enoto, Teruaki, additional, Agudo, Iván, additional, Antonelli, Lucio, additional, Bachetti, Matteo, additional, Baldini, Luca, additional, Baumgartner, Wayne, additional, Bellazzini, Ronaldo, additional, Bongiorno, Stephen, additional, Bonino, Raffaella, additional, Brez, Alessandro, additional, Bucciantini, Niccolo, additional, Capitanio, Fiamma, additional, Castellano, Simone, additional, Cavazzuti, Elisabetta, additional, Chen, Chien-Ting, additional, Ciprini, Stefano, additional, De Rosa, Alessandra, additional, Monte, Ettore Del, additional, Lalla, Niccolo Di, additional, Doroshenko, Victor, additional, Dovciak, Michal, additional, Ehlert, Steven, additional, Evangelista, Yuri, additional, Fabiani, Sergio, additional, Garcia, Javier, additional, Gunji, Shuichi, additional, Hayashida, Kiyoshi, additional, Heyl, Jeremy, additional, Ingram, Adam, additional, Iwakiri, Wataru, additional, Jorstad, Svetlana, additional, Kaaret, Philip, additional, Karas, Vladimir, additional, Kitaguchi, Takao, additional, Kolodziejczak, Jeffery, additional, Krawczynski, Henric, additional, Monaca, Fabio La, additional, Latronico, Luca, additional, Liodakis, Ioannis, additional, Maldera, Simone, additional, Manfreda, Alberto, additional, Marinucci, Andrea, additional, Marscher, Alan, additional, Marshall, Herman, additional, Massaro, Francesco, additional, Matt, Giorgio, additional, Mitsuishi, Ikuyuki, additional, Mizuno, Tsunefumi, additional, Negro, Michela, additional, Ng, C.-Y., additional, O'Dell, Stephen, additional, Omodei, Nicola, additional, Oppedisano, Chiara, additional, Papitto, Alessandro, additional, Pavlov, George, additional, Peirson, Abel, additional, Perri, Matteo, additional, Pesce-Rollins, Melissa, additional, Pilia, Maura, additional, Possenti, Andrea, additional, Poutanen, Juri, additional, Puccetti, Simonetta, additional, Ramsey, Brian, additional, Rankin, John, additional, Ratheesh, Ajay, additional, Roberts, Oliver, additional, Romani, Roger, additional, Sgro, Carmelo, additional, Slane, Patrick, additional, Spandre, Gloria, additional, Swartz, Doug, additional, Tamagawa, Toru, additional, Tavecchio, Fabrizio, additional, Taverna, Roberto, additional, Tawara, Yuzuru, additional, Tennant, Allyn, additional, Thomas, Nicholas, additional, Tombesi, Francesco, additional, Trois, Alessio, additional, Tsygankov, Sergey, additional, Turolla, Roberto, additional, Vink, Jacco, additional, Weisskopf, Martin, additional, Wu, Kinwah, additional, Xie, Fei, additional, and Zane, Silvia, additional

Published
2022
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16. In-flight monitoring and calibration of the x-ray polarimeters on board IXPE: year two

Author

Siegmund, Oswald H., Hoadley, Keri, Rankin, John, Muleri, Fabio, Ferrazzoli, Riccardo, Baldini, Luca, Baumgartner, Wayne, Costa, Enrico, Del Monte, Ettore, Di Marco, Alessandro, Dietz, Kurt, Ehlert, Steven R., Fabiani, Sergio, Kaaret, Philip, Kim, Dawoon, Kolodziejczak, Jeffery, La Monaca, Fabio, Latronico, Luca, Lefevre, Carlo, Manfreda, Alberto, O'Dell, Stephen L., Perri, Matteo, Puccetti, Simonetta, Ramsey, Brian D., Ratheesh, Ajay, Rubini, Alda, Sgrò, Carmelo, Soffitta, Paolo, Swartz, Doug, Tennant, Allyn F., Trois, Alessio, and Weisskopf, Martin C.

Published
2023
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17. MAIL ENTRIES.

Author

Hansson, Terren, Deeds, Nathan, Grosner, Tim, and Swartz, Doug

Abstract

Orange wasn't the first choice, but Jody had Troy Lee paint blue, red, green, chrome and orange helmets (all with the MXA design on them). THREE DECADES OF ORANGE Dear MXA, Has any helmet company ever approached you about selling an exact replica of MXA's orange helmet design? They were amazing works of art, but in June of 1994, MXA editor Jody Weisel wanted a stand-alone test rider helmet and decided that instead of a unique and different paint job on every MXA helmet, he wanted a single, branded MXA paint scheme for every bike test. [Extracted from the article]

Published
2022

18. Simultaneous space and phase resolved X-ray polarimetry of the Crab pulsar and nebula

Author

Niccolò Bucciantini, Riccardo Ferrazzoli, Matteo Bachetti, John Rankin, Niccolò Di Lalla, Carmelo Sgrò, Nicola Omodei, Takao Kitaguchi, Tsunefumi Mizuno, Shuichi Gunji, Eri Watanabe, Luca Baldini, Patrick Slane, Martin C. Weisskopf, Roger W. Romani, Andrea Possenti, Herman L. Marshall, Stefano Silvestri, Luigi Pacciani, Michela Negro, Fabio Muleri, Emma de Oña Wilhelmi, Fei Xie, Jeremy Heyl, Melissa Pesce-Rollins, Josephine Wong, Maura Pilia, Iván Agudo, Lucio A. Antonelli, Wayne H. Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Fiamma Capitanio, Simone Castellano, Elisabetta Cavazzuti, Chien-Ting Chen, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Alessandro Di Marco, Immacolata Donnarumma, Victor Doroshenko, Michal Dovčiak, Steven R. Ehlert, Teruaki Enoto, Yuri Evangelista, Sergio Fabiani, Javier A. Garcia, Kiyoshi Hayashida, Wataru Iwakiri, Svetlana G. Jorstad, Philip Kaaret, Vladimir Karas, Fabian Kislat, Jeffery J. Kolodziejczak, Henric Krawczynski, Fabio La Monaca, Luca Latronico, Ioannis Liodakis, Simone Maldera, Alberto Manfreda, Frédéric Marin, Andrea Marinucci, Alan P. Marscher, Francesco Massaro, Giorgio Matt, Ikuyuki Mitsuishi, C.-Y. Ng, Stephen L. O’Dell, Chiara Oppedisano, Alessandro Papitto, George G. Pavlov, Abel L. Peirson, Matteo Perri, Pierre-Olivier Petrucci, Juri Poutanen, Simonetta Puccetti, Brian D. Ramsey, Ajay Ratheesh, Oliver J. Roberts, Paolo Soffitta, Gloria Spandre, Doug Swartz, Toru Tamagawa, Fabrizio Tavecchio, Roberto Taverna, Yuzuru Tawara, Allyn F. Tennant, Nicolas E. Thomas, Francesco Tombesi, Alessio Trois, Sergey Tsygankov, Roberto Turolla, Jacco Vink, Kinwah Wu, Silvia Zane, Bucciantini, Niccol??, Ferrazzoli, Riccardo, Bachetti, Matteo, Rankin, John, Di Lalla, Niccol??, Sgr??, Carmelo, Omodei, Nicola, Kitaguchi, Takao, Mizuno, Tsunefumi, Gunji, Shuichi, Watanabe, Eri, Baldini, Luca, Slane, Patrick, Weisskopf, Martin C., Romani, Roger W., Possenti, Andrea, Marshall, Herman L., Silvestri, Stefano, Pacciani, Luigi, Negro, Michela, Muleri, Fabio, de O??a Wilhelmi, Emma, Xie, Fei, Heyl, Jeremy, Pesce-Rollins, Melissa, Wong, Josephine, Pilia, Maura, Agudo, Iv??n, Antonelli, Lucio A., Baumgartner, Wayne H., Bellazzini, Ronaldo, Bianchi, Stefano, Bongiorno, Stephen D., Bonino, Raffaella, Brez, Alessandro, Capitanio, Fiamma, Castellano, Simone, Cavazzuti, Elisabetta, Chen, Chien-Ting, Ciprini, Stefano, Costa, Enrico, DE ROSA, Alessandra, Del Monte, Ettore, Di Gesu, Laura, Di Marco, Alessandro, Donnarumma, Immacolata, Doroshenko, Victor, Dov??iak, Michal, Ehlert, Steven R., Enoto, Teruaki, Evangelista, Yuri, Fabiani, Sergio, Garcia, Javier A., Hayashida, Kiyoshi, Iwakiri, Wataru, Jorstad, Svetlana G., Kaaret, Philip, Karas, Vladimir, Kislat, Fabian, Kolodziejczak, Jeffery J., Krawczynski, Henric, La Monaca, Fabio, Latronico, Luca, Liodakis, Ioanni, Maldera, Simone, Manfreda, Alberto, Marin, Fr??d??ric, Marinucci, Andrea, Marscher, Alan P., Massaro, Francesco, Matt, Giorgio, Mitsuishi, Ikuyuki, Ng, C. -Y., O???dell, Stephen L., Oppedisano, Chiara, Papitto, Alessandro, Pavlov, George G., Peirson, Abel L., Perri, Matteo, Petrucci, PIERRE-OLIVIER, Poutanen, Juri, Puccetti, Simonetta, Ramsey, Brian D., Ratheesh, Ajay, Roberts, Oliver J., Soffitta, Paolo, Spandre, Gloria, Swartz, Doug, Tamagawa, Toru, Tavecchio, Fabrizio, Taverna, Roberto, Tawara, Yuzuru, Tennant, Allyn F., Thomas, Nicolas E., Tombesi, Francesco, Trois, Alessio, Tsygankov, Sergey, Turolla, Roberto, Vink, Jacco, Wu, Kinwah, and Zane, Silvia

Subjects
Astronomy and Astrophysics
Published
2023

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