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6,192 results on '"Galactic plane"'

1. SRG/ART-XC Galactic Plane Survey near Galactic Longitude : Catalog of Sources.

Author

Karasev, D. I., Semena, A. N., Mereminskiy, I. A., Lutovinov, A. A., Burenin, R. A., Krivonos, R. A., Sazonov, S. Yu., Arefiev, V. A., Buntov, M. V., Lapshov, I. Yu., Levin, V. V., Pavlinsky, M. N., Tkachenko, A. Yu., and Shtykovsky, A. E.

Subjects
*LONGITUDE, *GALAXY clusters, *CATALOGS, *CATALOGING, *GALACTIC redshift, *RADIO galaxies
Abstract

We present a catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope onboard the SRG space observatory during the observations of the Galactic plane region near a longitude (L20 field) in October 2019. The L20 field was observed four times in the scanning mode, which provided a uniform coverage of the sky region with a total area of with a median sensitivity of erg s cm (at 50 detection completeness) in the 4–12 keV energy band. As a result, we have detected 29 X-ray sources at a statistically significant level, 11 of which have not been detected previously by other X-ray observatories. Preliminary estimates show that four of them can presumably be extragalactic in nature. We also show that the source SRGA J183220.1 103508 (CXOGSG J183220.8 103510) is most likely a galaxy cluster containing a bright radio galaxy at redshift . [ABSTRACT FROM AUTHOR]

Published
2023
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2. Prospects for detection of a galactic diffuse neutrino flux

Author

P. De La Torre Luque, D. Gaggero, D. Grasso, and A. Marinelli

Subjects
galactic cosmic rays, cosmic-ray transport, diffuse gamma rays, high energy gamma rays, diffuse neutrinos, galactic plane, Astronomy, QB1-991, Geophysics. Cosmic physics, QC801-809
Abstract

A Galactic cosmic-ray transport model featuring non-homogeneous transport has been developed over the latest years. This setup is aimed at reproducing γ-ray observations in different regions of the Galaxy (with particular focus on the progressive hardening of the hadronic spectrum in the inner Galaxy) and was shown to be compatible with the very-high-energy γ-ray diffuse emission recently detected up to PeV energies. In this work, we extend the results previously presented to test the reliability of that model throughout the whole sky. To this aim, we compare our predictions with detailed longitude and latitude profiles of the diffuse γ-ray emission measured by Fermi-LAT for different energies and compute the expected Galactic ν diffuse emission, comparing it with current limits from the ANTARES collaboration. We emphasize that the possible detection of a Galactic ν component will allow us to break the degeneracy between our model and other scenarios featuring prominent contributions from unresolved sources and TeV halos.

Published
2022
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7. Distances

Author

Magnani, Loris, Shore, Steven N., Burton, W.B., Series editor, Magnani, Loris, and Shore, Steven N.

Published
2017
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9. The Galactic Center and Activity

Author

Sofue, Yoshiaki, Hänggi, Peter, Series editor, Hjorth-Jensen, Morten, Series editor, Jones, Richard A L, Series editor, Lewenstein, Maciej, Series editor, von Löhneysen, H., Series editor, Rubio, Angel, Series editor, Theisen, Stefan, Series editor, Vollhardt, Dieter, Series editor, Wells, J. D., Series editor, Schleich, Wolfgang, Series editor, and Sofue, Yoshiaki

Published
2017
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10. Interstellar Matter

Author

Sofue, Yoshiaki, Hänggi, Peter, Series editor, Hjorth-Jensen, Morten, Series editor, Jones, Richard A L, Series editor, Lewenstein, Maciej, Series editor, von Löhneysen, H., Series editor, Rubio, Angel, Series editor, Theisen, Stefan, Series editor, Vollhardt, Dieter, Series editor, Wells, J. D., Series editor, Schleich, Wolfgang, Series editor, and Sofue, Yoshiaki

Published
2017
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11. Star Formation and Death

Author

Sofue, Yoshiaki, Hänggi, Peter, Series editor, Hjorth-Jensen, Morten, Series editor, Jones, Richard A L, Series editor, Lewenstein, Maciej, Series editor, von Löhneysen, H., Series editor, Rubio, Angel, Series editor, Theisen, Stefan, Series editor, Vollhardt, Dieter, Series editor, Wells, J. D., Series editor, Schleich, Wolfgang, Series editor, and Sofue, Yoshiaki

Published
2017
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12. The Interstellar Medium

Author

Karttunen, Hannu, Kröger, Pekka, Oja, Heikki, Poutanen, Markku, Donner, Karl Johan, Karttunen, Hannu, editor, Kröger, Pekka, editor, Oja, Heikki, editor, Poutanen, Markku, editor, and Donner, Karl Johan, editor

Published
2017
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13. Spheres and Coordinates

Author

Gallaway, Mark, Ashby, Neil, Series editor, Brantley, William, Series editor, Deady, Matthew, Series editor, Fowler, Michael, Series editor, Hjorth-Jensen, Morten, Series editor, Inglis, Michael, Series editor, Klose, Heinz, Series editor, Sherif, Helmy, Series editor, and Gallaway, Mark

Published
2016
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24. Understanding the Universe: Cosmology, Astrophysics, Particles, and Their Interactions

Author

De Angelis, Alessandro, Pimenta, Mário João Martins, Ashby, Neil, Series editor, Brantley, William, Series editor, Deady, Matthew, Series editor, Fowler, Michael, Series editor, Hjorth-Jensen, Morten, Series editor, Inglis, Michael, Series editor, Klose, Heinz, Series editor, Sherif, Helmy, Series editor, De Angelis, Alessandro, and Pimenta, Mário João Martins

Published
2015
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28. Astrometry Projects

Author

Hubbell, Gerald R., Williams, Richard J., Billard, Linda M., Watson, John, Series editor, Hubbell, Gerald R., Williams, Richard J., and Billard, Linda M.

Published
2015
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30. The TeV Sky and Multiwavelength Astrophysics

Author

Spurio, Maurizio, Börner, Gerhard, Series editor, Burkert, Andreas, Series editor, Burton, W.B., Series editor, Coustenis, Athena, Series editor, Dopita, Michael A., Series editor, Leibundgut, Bruno, Series editor, Meynet, Georges, Series editor, Schneider, Peter, Series editor, Trimble, Virginia, Series editor, Ward-Thompson, Derek, Series editor, Robson, E. Ian, Series editor, and Spurio, Maurizio

Published
2015
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31. The Cosmic Rays and Our Galaxy

Author

Spurio, Maurizio, Börner, Gerhard, Series editor, Burkert, Andreas, Series editor, Burton, W.B., Series editor, Coustenis, Athena, Series editor, Dopita, Michael A., Series editor, Leibundgut, Bruno, Series editor, Meynet, Georges, Series editor, Schneider, Peter, Series editor, Trimble, Virginia, Series editor, Ward-Thompson, Derek, Series editor, Robson, E. Ian, Series editor, and Spurio, Maurizio

Published
2015
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32. Gould’s Belt

Author

Palouš, Jan, Ehlerová, Soňa, Freeman, Kenneth, editor, Elmegreen, Bruce, editor, Block, David, editor, and Woolway, Matthew, editor

Published
2015
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34. The Galactic Bar

Author

Gerhard, Ortwin, Wegg, Christopher, Freeman, Kenneth, editor, Elmegreen, Bruce, editor, Block, David, editor, and Woolway, Matthew, editor

Published
2015
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38. The 6.7 keV thermal emission lines in the stellar flare spectra of two chromospherically active Binaries: Algol and GT Mus

Author

Ambrose Chukwudi Eze, Chikwem Obinna Goodwill, Sudum Esaenwi, and Fidelis Okey Madu

Subjects
Physics, Atmospheric Science, Astrophysics::High Energy Astrophysical Phenomena, Galactic ridge, Starspot, Aerospace Engineering, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Galactic plane, Galaxy, law.invention, Luminosity, Geophysics, Space and Planetary Science, law, Physics::Space Physics, Astrophysics::Solar and Stellar Astrophysics, General Earth and Planetary Sciences, Emission spectrum, Equivalent width, Astrophysics::Galaxy Astrophysics, Flare
Abstract

Chromospherically active binaries’ (CABs) are late-type evolved stars with strong chromosphere/coronae and high flare activity levels. Starspot evolution in these CABs and binaries reveals strong stellar and chromospheric activities. In binaries, the tidal interaction via the internal dynamo motion, during rapid rotation of the component stars generates magnetic fields. The magnetic activity heats the tenuous coronal plasma, and the reconnection of energetic particles leads to stellar flare formation. Cyclic-variation signatures in brightness and emission lines are indicators of coronal/chromospheric activities. The spatial population densities of CABs are large, and their hard energy spectral characteristics are prominent in our galaxy. Photo-ionization/collisional excitation processes in the coronae of CABs generate a strong thermal emission line at 6.7 keV. In the present work, we re-analyzed stellar flare data of two CABs (Algol & GT Muscae) observed with Suzaku. We resolved the 6.7 keV emission spectrum and equivalent width (EW) in each source’s stellar flare data. The resolved energy spectra are remarkably similar to that of the hard energy spectra at 6.7 keV of X-ray point sources observed in different Galactic regions. The EW of the 6.7 keV emission line obtained in this work compares favorably with the EW range (260 eV – 980 eV) of the 6.7 keV energy spectra of Galactic point sources. Hence, cumulative X-ray emission lines of coronal plasma (and their EWs) emitted by numerous point sources in different Galactic plane positions give clues on the Galactic Ridge X-ray Emission (GRXE) mechanism. We are of the view that CABs could account for a large number of fast-transient X-ray sources that emit thermal emission line at 6.7 keV during their quiescent and flared phases, and these underlying population sources could contribute significantly to the total luminosity of 6.7 keV GRXE.

Published
2022

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