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Your search keyword '"Proga, D"' showing total 9 results
Start Over Author "Proga, D" Journal astronomy & astrophysics
9 results on '"Proga, D"'

1. Coordinated X-ray and UV absorption within the accretion disk wind of the active galactic nucleus PG 1126-041

Author

Giustini, M., primary, Rodríguez Hidalgo, P., additional, Reeves, J. N., additional, Matzeu, G., additional, Braito, V., additional, Eracleous, M., additional, Chartas, G., additional, Schartel, N., additional, Vignali, C., additional, Hall, P. B., additional, Waters, T., additional, Ponti, G., additional, Proga, D., additional, Dadina, M., additional, Cappi, M., additional, Miniutti, G., additional, and de Vries, L., additional

Published
2023
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2. Supermassive Black Hole Winds in X-rays: SUBWAYS

Author

Matzeu, G. A., primary, Brusa, M., additional, Lanzuisi, G., additional, Dadina, M., additional, Bianchi, S., additional, Kriss, G., additional, Mehdipour, M., additional, Nardini, E., additional, Chartas, G., additional, Middei, R., additional, Piconcelli, E., additional, Gianolli, V., additional, Comastri, A., additional, Longinotti, A. L., additional, Krongold, Y., additional, Ricci, F., additional, Petrucci, P. O., additional, Tombesi, F., additional, Luminari, A., additional, Zappacosta, L., additional, Miniutti, G., additional, Gaspari, M., additional, Behar, E., additional, Bischetti, M., additional, Mathur, S., additional, Perna, M., additional, Giustini, M., additional, Grandi, P., additional, Torresi, E., additional, Vignali, C., additional, Bruni, G., additional, Cappi, M., additional, Costantini, E., additional, Cresci, G., additional, De Marco, B., additional, De Rosa, A., additional, Gilli, R., additional, Guainazzi, M., additional, Kaastra, J., additional, Kraemer, S., additional, La Franca, F., additional, Marconi, A., additional, Panessa, F., additional, Ponti, G., additional, Proga, D., additional, Ursini, F., additional, Baldini, P., additional, Fiore, F., additional, King, A. R., additional, Maiolino, R., additional, Matt, G., additional, and Merloni, A., additional

Published
2023
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3. Direct probe of the inner accretion flow around the supermassive black hole in NGC 2617

Author

Giustini, M., primary, Costantini, E., additional, De Marco, B., additional, Svoboda, J., additional, Motta, S. E., additional, Proga, D., additional, Saxton, R., additional, Ferrigno, C., additional, Longinotti, A. L., additional, Miniutti, G., additional, Grupe, D., additional, Mathur, S., additional, Shappee, B. J., additional, Prieto, J. L., additional, and Stanek, K., additional

Published
2017
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7. X-ray/ultraviolet observing campaign of the Markarian 279 active galactic nucleus outflow: a close look at the absorbing/emitting gas with Chandra-LETGS

Author

Costantini, E., primary, Kaastra, J. S., additional, Arav, N., additional, Kriss, G. A., additional, Steenbrugge, K. C., additional, Gabel, J. R., additional, Verbunt, F., additional, Behar, E., additional, Gaskell, C. M., additional, Korista, K. T., additional, Proga, D., additional, Kim Quijano, J., additional, Scott, J. E., additional, Klimek, E. S., additional, and Hedrick, C. H., additional

Published
2006
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9. Variable X-ray absorption in the mini-BAL QSO PG 1126-041

Author

George Chartas, Margherita Giustini, Mauro Dadina, Gabriele Ponti, Cristian Vignali, Daniel Proga, Francesco Tombesi, Michael Eracleous, Giorgio G. C. Palumbo, Massimo Cappi, Giustini M., Cappi M., Chartas G., Dadina M., Eracleous M., Ponti G., Proga D., Tombesi F., Vignali C., and Palumbo G.G.C.

Subjects
QSOS, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Active galactic nucleus, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, METHODS: DATA ANALYSIS, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Spectral line, X-rays: individuals: PG 1126-041, techniques: photometric, Settore FIS/05 - Astronomia e Astrofisica, 0103 physical sciences, ACCRETION, accretion disk, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Supermassive black hole, Spectral index, quasars: individual: PG 1126-041, Line-of-sight, 010308 nuclear & particles physics, Astronomy and Astrophysics, Quasar, Accretion (astrophysics), 13. Climate action, Space and Planetary Science, Astrophysics - High Energy Astrophysical Phenomena, techniques: spectroscopic, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

X-ray studies of active galactic nuclei (AGN) with powerful nuclear winds are important for constraining the physics of the inner accretion/ejection flow around supermassive black holes (SMBHs) and for understanding the impact of such winds on the AGN environment. Our main scientific goal is to constrain the properties of the circum-nuclear matter close to the SMBH in the mini-broad absorption line quasar (mini-BAL QSO) PG 1126-041 using a multi-epoch observational campaign with XMM-Newton. We performed temporally resolved X-ray spectroscopy and simultaneous UV and X-ray photometry on the most complete set of observations and on the deepest X-ray exposure of a mini-BAL QSO ever. We found complex X-ray spectral variability on time scales of both months and hours, which is best reproduced by means of variable massive ionized absorbers along the line of sight. As a consequence, the observed optical-to-X-ray spectral index is found to be variable with time. In the highest signal-to-noise observation we detected highly ionized X-ray absorbing material outflowing much faster (v ~ 16500 km/s) than the UV absorbing one (v ~ 5000 km/s). This highly ionized absorber is found to be variable on very short (a few kiloseconds) time scales. Our findings are qualitatively consistent with line-driven accretion disk winds scenarios. Our observations have opened the time-resolved X-ray spectral analysis field for mini-BAL QSOs. Only with future deep studies will we be able to map the dynamics of the inner flow and understand the physics of AGN winds and their impact on the environment., Replaced to match the published version

Published
2011
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