Search Results - "PONTI, G"

Detection of large-scale X-ray bubbles in the Milky Way halo by Predehl, P., Sunyaev, R. A., Becker, W., Brunner, H., Burenin, R., Bykov, A., Cherepashchuk, A., Chugai, N., Churazov, E., Doroshenko, V., Eismont, N., Freyberg, M., Gilfanov, M., Haberl, F., Khabibullin, I., Krivonos, R., Maitra, C., Medvedev, P., Merloni, A., Nandra, K., Nazarov, V., Pavlinsky, M., Ponti, G., Sanders, J. S., Sasaki, M., Sazonov, S., Strong, A. W., Wilms, J.

“…The halo of the Milky Way provides a laboratory to study the properties of the shocked hot gas that is predicted by models of galaxy formation. There is…”
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Discovery of a relation between black hole mass and soft X-ray time lags in active galactic nuclei by De Marco, B., Ponti, G., Cappi, M., Dadina, M., Uttley, P., Cackett, E. M., Fabian, A. C., Miniutti, G.

“…We carried out a systematic analysis of time lags between X-ray energy bands in a large sample (32 sources) of unabsorbed, radio quiet active galactic nuclei…”
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Not that long time ago in the nearest galaxy: 3D slice of molecular gas revealed by a 110 yr old flare of Sgr A by Churazov, E, Khabibullin, I, Sunyaev, R, Ponti, G

“…A powerful outburst of X-ray radiation from the supermassive black hole Sgr A* at the centre of the Milky Way is believed to be responsible for the…”
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Regulation of black-hole accretion by a disk wind during a violent outburst of V404 Cygni by Muñoz-Darias, T., Casares, J., Sánchez, D. Mata, Fender, R. P., Padilla, M. Armas, Linares, M., Ponti, G., Charles, P. A., Mooley, K. P., Rodriguez, J.

“…A sustained, neutral wind from the outer accretion disk is observed in the transient black hole V404 Cygni during a violent outburst; this unusual wind, which…”
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A tidal disruption flare in a massive galaxy? Implications for the fuelling mechanisms of nuclear black holes by Merloni, A., Dwelly, T., Salvato, M., Georgakakis, A., Greiner, J., Krumpe, M., Nandra, K., Ponti, G., Rau, A.

“…We argue that the ‘changing look’ active galactic nucleus (AGN) recently reported by LaMassa et al. could be a luminous flare produced by the tidal disruption…”
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An X-ray chimney extending hundreds of parsecs above and below the Galactic Centre by Ponti, G., Hofmann, F., Churazov, E., Morris, M. R., Haberl, F., Nandra, K., Terrier, R., Clavel, M., Goldwurm, A.

“…Evidence has mounted in recent decades that outflows of matter and energy from the central few parsecs of our Galaxy have shaped the observed structure of the…”
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Ubiquitous equatorial accretion disc winds in black hole soft states by Ponti, G., Fender, R. P., Begelman, M. C., Dunn, R. J. H., Neilsen, J., Coriat, M.

“…ABSTRACT High‐resolution spectra of Galactic black holes (GBHs) reveal the presence of highly ionized absorbers. In one GBH, accreting close to the Eddington…”
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X-ray Quasi-Periodic Eruptions from Two Previously Quiescent Galaxies by Arcodia, R, Merloni, A, Nandra, K, Buchner, J, Salvato, M, Pasham, D, Remillard, R, Comparat, J, Lamer, G, Ponti, G, Malyali, A, Wolf, J, Arzoumanian, Z, Bogensberger, D, Buckley, D A H, Gendreau, K, Gromadzki, M, Kara, E, Krumpe, M, Markwardt, C, Ramos-Ceja, M E, Rau, A, Schramm, M, Schwope, A

“…Quasi-Periodic Eruptions (QPEs) are extreme high-amplitude bursts of X-ray radiation recurring every few hours and originating near the central supermassive…”
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X-Ray Observations of the Isolated Black Hole Candidate OGLE-2011-BLG-0462 and Other Collapsed Objects Discovered through Gravitational Microlensing by Mereghetti, S., Sidoli, L., Ponti, G., Treves, A.

“…Abstract Isolated black holes and neutron stars can be revealed through the observation of long-duration gravitational microlensing events. A few candidates…”
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Relativistic Fe Kα line study in Seyfert 1 galaxies observed with Suzaku by Mantovani, G., Nandra, K., Ponti, G.

“…We present an analysis of a sample of Seyfert 1 galaxies observed with Suzaku. The aim of this work is to examine critically the evidence for a relativistic Fe…”
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Revealing accretion on to black holes: X-ray reflection throughout three outbursts of GX 339−4 by Plant, D. S., Fender, R. P., Ponti, G., Muñoz-Darias, T., Coriat, M.

“…Understanding the dynamics behind black hole state transitions and the changes they reflect in outbursts has become long-standing problem. The X-ray reflection…”
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Discovery of a Superluminal Fe K Echo at the Galactic Center: The Glorious Past of Sgr A Preserved by Molecular Clouds by Ponti, G, Terrier, R, Goldwurm, A, Belanger, G, Trap, G

“…We present the result of a study of the X-ray emission from the galactic center (GC) molecular clouds (MCs) within 15 arcmin from Sgr A*. We use XMM-Newton…”
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High-energy monitoring of NGC 4593 II. Broad-band spectral analysis: testing the two-corona model by Middei, R, Bianchi, S, Petrucci, P-O, Ursini, F, Cappi, M, De Marco, B, De Rosa, A, Malzac, J, Marinucci, A, Matt, G, Ponti, G, Tortosa, A

“…It is widely believed that the primary X-ray emission of AGN is due to the Comptonization of optical-UV photons from a hot electron corona, while the origin of…”
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Simultaneous X-Ray and Infrared Observations of Sagittarius A's Variability by Boyce, H., Haggard, D., Witzel, G., Willner, S. P., Neilsen, J., Hora, J. L., Markoff, S., Ponti, G., Baganoff, F., Becklin, E. E., Fazio, G. G., Lowrance, P., Morris, M. R., Smith, H. A.

“…Emission from Saggitarius A* is highly variable at both X-ray and infrared (IR) wavelengths. Observations over the last ∼20 yr have revealed X-ray flares that…”
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The XMM–Newton view of the central degrees of the Milky Way by Ponti, G., Morris, M. R., Terrier, R., Haberl, F., Sturm, R., Clavel, M., Soldi, S., Goldwurm, A., Predehl, P., Nandra, K., Bélanger, G., Warwick, R. S., Tatischeff, V.

“…The deepest XMM–Newton mosaic map of the central 1 $_{.}^{\circ}$ 5 of the Galaxy is presented, including a total of about 1.5 Ms of EPIC-pn cleaned exposures…”
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Inclination and relativistic effects in the outburst evolution of black hole transients by Muñoz-Darias, T., Coriat, M., Plant, D. S., Ponti, G., Fender, R. P., Dunn, R. J. H.

“…We have systematically studied the effect of the orbital inclination in the outburst evolution of black hole transients. We have included all the systems…”
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A powerful flare from Sgr A confirms the synchrotron nature of the X-ray emission by Ponti, G., George, E., Scaringi, S., Zhang, S., Jin, C., Dexter, J., Terrier, R., Clavel, M., Degenaar, N., Eisenhauer, F., Genzel, R., Gillessen, S., Goldwurm, A., Habibi, M., Haggard, D., Hailey, C., Harrison, F., Merloni, A., Mori, K., Nandra, K., Ott, T., Pfuhl, O., Plewa, P. M., Waisberg, I.

“…Abstract We present the first fully simultaneous fits to the near-infrared (NIR) and X-ray spectral slope (and its evolution) during a very bright flare from…”
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Broad line emission from iron K- and L-shell transitions in the active galaxy 1H 0707-495 by Caballero-Garcia, M. D, Young, A. J, Uttley, P, Miller, J. M, Miniutti, G, Boller, T, Reynolds, C. S, Fabian, A. C, Ross, R. R, Tanaka, Y, Larsson, J, Ponti, G, Brandt, W. N, Gallo, L. C, Reis, R. C, Blustin, A. J, Zoghbi, A

“…Since the 1995 discovery of the broad iron K-line emission from the Seyfert galaxy MCG-6-30-15 (ref. 1), broad iron K lines have been found in emission from…”
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The puzzling orbital period evolution of the LMXB AX J1745.6−2901 by Ponti, G, De, K, Munoz-Darias, T, Stella, L, Nandra, K

“…The orbital period evolution of X-ray binaries provides fundamental clues to understanding mechanisms of angular momentum transfer and loss in these systems…”
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Long XMM observation of the narrow-line Seyfert 1 galaxy IRAS 13224−3809: rapid variability, high spin and a soft lag by Fabian, A. C., Kara, E., Walton, D. J., Wilkins, D. R., Ross, R. R., Lozanov, K., Uttley, P., Gallo, L. C., Zoghbi, A., Miniutti, G., Boller, T., Brandt, W. N., Cackett, E. M., Chiang, C.-Y., Dwelly, T., Malzac, J., Miller, J. M., Nardini, E., Ponti, G., Reis, R. C., Reynolds, C. S., Steiner, J. F., Tanaka, Y., Young, A. J.

“…The narrow-line Seyfert 1 galaxy IRAS 13224−3809 has been observed with XMM-Newton for 500 ks. The source is rapidly variable on time-scales down to a few 100…”
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