Browsing by Author "Fabian, Andrew C."

Browsing by Author "Fabian, Andrew C."

Sort by: Order: Results:

  • Thumbnail
    The hard X-ray perspective on the soft X-ray excess 
    Vasudevan, Ranjan V.; Mushotzky, Richard F.; Reynolds, Christopher S.; Fabian, Andrew C.; Lohfink, Anne M.; Zoghbi, Abderahmen; Gallo, Luigi C.; Walton, Dominic (IOP Publishing Limited, 2014-04-10)
    The X-ray spectra of many active galactic nuclei exhibit a “soft excess” below 1 keV, whose physical origin remains unclear. Diverse models have been suggested to account for it, including ionized reflection ...

  • Thumbnail
    High Density Reflection Spectroscopy – II. the density of the inner black hole accretion disc in AGN 
    Jiang, Jiachen; Fabian, Andrew C.; Dauser, Thomas; Gallo, Luigi C.; Garcia, Javier A.; Kara, Erin; Parker, Michael L.; Tomsick, John A.; Walton, Dominic J.; Reynolds, Christopher S. (Oxford University PressRoyal Astronomical Society, 2019-08-22)
    We present a high density disc reflection spectral analysis of a sample of 17 Seyfert 1 galaxies to study the inner disc densities at different black hole mass scales and accretion rates. All the available XMM– ...

  • Thumbnail
    A low-flux state in IRAS 00521−7054 seen with NuSTAR and XMM–Newton: relativistic reflection and an ultrafast outflow 
    Walton, Dominic; Nardini, Emanuele; Gallo, Luigi C.; Reynolds, M. T.; Ricci, C.; Dauser, Thomas; Fabian, Andrew C.; Garcia, J. A.; Harrison, F. A.; Risaliti, G.; Stern, D. (Oxford University PressRoyal Astronomical Society, 2019-01-16)
    We present results from a deep, coordinated XMM–Newton + NuSTAR observation of the Seyfert 2 galaxy IRAS 00521−7054. The NuSTAR data provide the first detection of this source in ...

  • Thumbnail
    The nuclear environment of the NLS1 Mrk 335: Obscuration of the X-ray line emission by a variable outflow 
    Parker, M. L.; Longinotti, A. L.; Schartel, N.; Grupe, D.; Komossa, S.; Kriss, G.; Fabian, Andrew C.; Gallo, Luigi C.; Harrison, F. A.; Jiang, J.; Kara, E.; Krongold, Y.; Matzeu, G. A.; Pinto, C.; Santos-Lleo, M. (Royal Astronomical SocietyOxford University Press, 2019-09-12)
    We present XMM–Newton, NuSTAR, Swift, and Hubble Space Telescope observations of the Narrow-line Seyfert 1 galaxy Mrk 335 in a protracted low state in 2018 and 2019. The X-ray flux ...

  • Thumbnail
    A remarkable long-term light curve and deep, low-state spectroscopy: Swift and XMM-Newton monitoring of the NLS1 galaxy Mkn 335 
    Gallo, Luigi C.; Gruberbauer, Michael; Grupe, Dirk; Komossa, S.; Longinotti, Anna Lia; Fabian, Andrew C.; Pradhan, Anil K.; Xu, Dawei (American Astronomical Society, 2012-04)
    The narrow-line Seyfert 1 galaxy (NLS1) Mkn 335 is remarkable because it has repeatedly shown deep, long X-ray low states that show pronounced spectral structure. It has become one of the prototype active galactic nuclei ...

  • Thumbnail
    Swift, NuStar and XMM-Newton observations of the NLS1 galaxy RX J2317.8–4422 in an extreme X-ray low flux state 
    Grupe, Dirk; Komossa, S.; Gallo, Luigi C.; Schartel, Norbert; Parker, Michael; Santos-Lleo, Maria; Fabian, Andrew C.; Harrison, Fiona; Miniutti, Giovanni (Oxford University PressRoyal Astronomical Society, 2019-03-20)
    We report the discovery of RX J2317.8–4422 in an extremely low X-ray flux state by the Neil Gehrels Swift observatory in 2014 April/May. In total, the low-energy X-ray emission dropped by a factor of 100. ...

  • Thumbnail
    XMM-Newton observations of the narrow-line Seyfert 1 galaxy Mrk 335 in a historical low X-ray flux state 
    Gallo, Luigi C.; Grupe, Dirk; Komossa, Stefanie; Fabian, Andrew C.; Larsson, Josefin; Pradhan, Anil K.; Xu, Dawei; Miniutti, Giovanni (American Astronomical Society, 2008-07)
    We report the discovery of strong soft X-ray emission lines and a hard continuum above 2 keV in the narrow-line Seyfert 1 galaxy Mrk 335 during an extremely low X-ray flux state. Mrk 335 was observed for 22 ks by XMM-Newton ...