359 citations · 5k across the 87 of their papers we have counts for
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X-Ray Spectral Variability of the Seyfert Galaxy NGC 4051 Observed with Suzaku
Y. Terashima, L. C. Gallo, H. Inoue +13
We report results from a Suzaku observation of the narrow-line Seyfert 1 NGC 4051. During our observation, large amplitude rapid variability is seen and the averaged 2--10 keV flux…
A systematic look at the Very High and Low/Hard state of GX 339-4: Constraining the black hole spin with a new reflection model
R. C. Reis, A. C. Fabian, R. Ross +3
We present a systematic study of GX 339-4 in both its very high and low hard states from simultaneous observations made with XMM-Newton and RXTE in 2002 and 2004. The X-ray spectra…
Suzaku observations of Markarian 335: evidence for a distributed reflector
J. Larsson, G. Miniutti, A. C. Fabian +3
We report on a 151 ks net exposure Suzaku observation of the Narrow Line Seyfert 1 galaxy Mrk 335. The 0.5-40 keV spectrum contains a broad Fe line, a strong soft excess below abou…
The Suzaku Observation of NGC 3516: Complex Absorption and the Broad and Narrow Fe K Lines
A. Markowitz, J. N. Reeves, G. Miniutti +10
We present results from a 150 ksec Suzaku observation of the Seyfert 1.5 NGC 3516 in October 2005. The source was in a relatively highly absorbed state. Our best-fit model is consi…
Exploring the X-ray spectral variability of MCG-6-30-15 with XMM-Newton
J. Larsson, A. C. Fabian, G. Miniutti +1
We present a study of the spectral variability of the Seyfert I galaxy MCG-6-30-15 based on the two long XMM-Newton observations from 2000 and 2001. The X-ray spectrum and variabil…
Strong gravity effects: X-ray spectra, variability and polarimetry
A. C. Fabian
Accreting black holes often show iron line emission in their X-ray spectra. When this line emission is very broad or variable then it is likely to originate from close to the black…
A longer XMM-Newton look at I Zwicky 1: Variability of the X-ray continuum, absorption, and iron Kalpha line
L. C. Gallo, W. N. Brandt, E. Costantini +3
We present the second XMM-Newton observation (85 ks) of the narrow-line Seyfert 1 galaxy (NLS1) I Zw 1 and describe its mean spectral and timing characteristics. On average, I Zw 1…
A possible line-like emission feature at 8 keV in the Seyfert 1.2 UGC 3973
L. C. Gallo, A. C. Fabian, Th. Boller +1
Two short X-ray exposures (< 3600 s each) of the radio-quiet Seyfert 1.2 galaxy UGC 3973 (Mrk 79) were conducted with XMM-Newton as part of an AGN snap-shot survey. In this paper w…
A Chandra HETGS Spectral Study of the Iron K Bandpass in MCG-6-30-15: A Narrow View of the Broad Iron Line
A. J. Young, J. C. Lee, A. C. Fabian +3
We present a high resolution X-ray spectrum of the iron K bandpass in MCG-6-30-15 based on a 522 ksec observation with Chandra's High Energy Transmission Grating Spectrometer. The…
A comprehensive range of X-ray ionized reflection models
R. R. Ross, A. C. Fabian
X-ray ionized reflection occurs when a surface is irradiated with X-rays so intense that its ionization state is determined by the ionization parameter xi propto F/n, where F is th…
Broad Iron Lines in AGN and X-ray Binaries
A. C. Fabian
Several AGN and black hole X-ray binaries show a clear very broad iron line which is strong evidence that the black holes are rapidly spinning. Detailed analysis of these objects s…
An intense soft-excess and evidence for light bending in the luminous narrow-line quasar PHL 1092
L. C. Gallo, Th. Boller, W. N. Brandt +2
The narrow-line quasar PHL 1092 was observed by XMM-Newton at two epochs separated by nearly thirty months. Timing analyses confirm the extreme variability observed during previous…
The lack of variability of the iron line in MCG-6-30-15: general relativistic effects
G. Miniutti, A. C. Fabian, R. Goyder +1
The spectrum and variability of the Seyfert galaxy MCG-6-30-15 can be decomposed into two apparently disconnected components: a highly variable power law and an almost constant com…
The Contribution of Particle Impact to the Production of Fe K Emission from Accreting Black Holes
D. R. Ballantyne, A. C. Fabian
The iron K line is perhaps the most important spectral diagnostic available in the study of accreting black holes. The line is thought to result from the reprocessing of external X…
An XMM-Newton observation of Ton S180: Constraints on the continuum emission in ultrasoft Seyfert galaxies
S. Vaughan, Th. Boller, A. C. Fabian +3
We present an XMM-Newton observation of the bright, narrow-line, ultrasoft Seyfert 1 galaxy Ton S180. The 0.3-10 keV X-ray spectrum is steep and curved, showing a steep slope above…
Multiple X-ray reflection from ionized slabs
R. R. Ross, A. C. Fabian, D. R. Ballantyne
Multiple reflection of X-rays may be important when an accretion disc and its hot corona have a complicated geometry, or if returning radiation due to gravitational light bending i…
The complex iron line in NGC 7469 observed by BeppoSAX
A. De Rosa, A. C. Fabian, L. Piro
In this letter we present analysis of BeppoSAX data from a long look at the Seyfert 1 galaxy NGC 7469. The presence of a soft excess below 0.8 keV is confirmed by our analysis and…
How the X-ray spectrum of a Narrow-Line Seyfert 1 galaxy may be reflection dominated
A. C. Fabian, D. R. Ballantyne, A. Merloni +3
A model for the inner regions of accretion flows is presented where, due to disc instabilities, cold and dense material is clumped into deep sheets or rings. Surrounding these dens…
Soft X-ray emission lines from photoionized accretion discs: constraints on their strength and width
D. R. Ballantyne, R. R. Ross, A. C. Fabian
We consider the properties of soft X-ray emission lines in the reprocessed emission from a photoionized accretion disc. Observations of these lines will be important in determining…
On the hard X-ray spectra of radio-loud active galaxies
D. R. Ballantyne, R. R. Ross, A. C. Fabian
Over the last few years X-ray observations of broad-line radio galaxies (BLRGs) by ASCA, RXTE and BeppoSAX have shown that these objects seem to exhibit weaker X-ray reflection fea…
Fe Kαemission from photoionized slabs: the impact of the iron abundance
D. R. Ballantyne, A. C. Fabian, R. R. Ross
Iron Kαemission from photoionized and optically thick material is observed in a variety of astrophysical environments including X-ray binaries, active galactic nuclei, and possibly…
The properties of the X-ray holes in the intracluster medium of the Perseus cluster
A. C. Fabian, A. Celotti, K. M. Blundell +2
High resolution X-ray and low frequency radio imaging now allow us to examine in detail the interaction and physical properties of the radio source 3C84 and the surrounding thermal…
BeppoSAX view of NGC 526A: a Seyfert 1.9 galaxy with a flat spectrum
R. Landi, L. Bassani, G. Malaguti +8
In the present work we report the BeppoSAX observation of the Seyfert 1.9 galaxy NGC 526A in the band 0.1-150 keV. The high energy instrument onboard, PDS, has succeeded in measuri…
Relativistic ionized accretion disc models of MCG--6-30-15
D. R. Ballantyne, A. C. Fabian
We present results from fitting ionized accretion disc models to three long ASCA observations of the Seyfert 1 galaxy MCG--6-30-15. All three datasets can be fit by a model consist…