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Heating and cooling in the Perseus cluster core
A. C. Fabian, J. S. Sanders
It is well known that the radiative cooling time of the hot X-ray emitting gas in the cores of most clusters of galaxies is less than 10^10 yr. In many clusters the gas temperature…
Bulk Comptonization spectra in blazars
Annalisa Celotti, Gabriele Ghisellini, Andrew C. Fabian
We study the time dependent spectra produced via the bulk Compton process by a cold, relativistic shell of plasma moving (and accelerating) along the jet of a blazar, scattering on…
Hard X-ray emission from the core of the Perseus cluster and the thermal content of the radio bubbles
J. S. Sanders, A. C. Fabian
We use a very deep 900 ks Chandra X-ray observation of the core of the Perseus cluster to measure and confirm the hard X-ray emission detected from a previous analysis. By fitting…
Suzaku discovery of iron absorption lines in outburst spectra of the X-ray transient 4U 1630-472
Aya Kubota, Tadayasu Dotani, Jean Cottam +12
We present the results of six Suzaku observations of the recurrent black hole transient 4U1630-472 during its decline from outburst from February 8 to March 23 in 2006. All observa…
Revealing the High Energy Emission from the Obscured Seyfert Galaxy MCG -5-23-16 with Suzaku
James N. Reeves, Hisamitsu Awaki, Gulab C. Dewangan +19
We report on a 100 ks Suzaku observation of the bright, nearby (z=0.008486) Seyfert 1.9 galaxy MCG -5-23-16. The broad-band (0.4-100 keV) X-ray spectrum allows us to determine the…
Suzaku Observations of the Centaurus Cluster: Absence of Bulk Motions in the Intracluster Medium
Naomi Ota, Yasushi Fukazawa, Andrew C. Fabian +13
The Centaurus cluster (z=0.0104) was observed with the X-ray Imaging Spectrometer (XIS) onboard the Suzaku X-ray satellite in three pointings, one centered on the cluster core and…
Investigating AGN Heating in a Sample of Nearby Clusters
R. J. H. Dunn, A. C. Fabian
We analyse those objects in the Brightest 55 sample of clusters of galaxies which have a short central cooling time and a central temperature drop. Such clusters are likely to requ…
Suzaku observations of the hard X-ray variability of MCG-6-30-15: the effects of strong gravity around a Kerr black hole
Giovanni Miniutti, Andrew C. Fabian, Naohisa Anabuki +21
Suzaku has, for the first time, enabled the hard X-ray variability of the Seyfert 1 galaxy MCG-6-30-15 to be measured. The variability in the 14-45 keV band, which is dominated by…
Using Radio Bubbles to Constrain the Matter Content of AGN Jets
R. J. H. Dunn, A. C. Fabian, A. Celotti
We revisit a method to obtain upper limits on the jet matter content combining synchrotron self-absorption constraints and the large scale bubble energy. We use both X-ray observat…
Radiative pressure feedback by a quasar in a galactic bulge
A. C. Fabian, A. Celotti, M. C. Erlund
We show that Eddington-limited black hole luminosities can be sufficient to deplete a galaxy bulge of gas through radiation pressure, when the ionization state of the gas and the p…
Have we detected the most luminous ULX so far?
G. Miniutti, G. Ponti, M. Dadina +4
We report the XMM-Newton detection of a moderately bright X-ray source superimposed on the outer arms of the inactive spiral galaxy MCG-03-34-63 (z=0.0213). It is clearly offset fr…
Enrichment in the Centaurus cluster of galaxies
J. S. Sanders, A. C. Fabian
We perform a detailed spatially-resolved, spectroscopic, analysis of the core of the Centaurus cluster of galaxies using a deep Chandra X-ray observation and XMM-Newton data. The C…
Isothermal shocks in Abell 2199 and 2A 0335+096?
J. S. Sanders, A. C. Fabian
We report on a partially circular X-ray surface brightness discontinuity found at about 55 kpc from the centre of Abell 2199 with Chandra X-ray observatory observations. Unlike col…
On the X-ray spectra of luminous, inhomogeneous accretion flows
A. Merloni, J. Malzac, A. C. Fabian +1
We discuss the expected X-ray spectral and variability properties of black hole accretion discs at high luminosity, under the hypothesis that radiation pressure dominated discs are…
Extended inverse-Compton emission from distant, powerful radio galaxies
M. C. Erlund, A. C. Fabian, Katherine M. Blundell +2
We present Chandra observations of two relatively high redshift FRII radio galaxies, 3C 432 and 3C 191 (z=1.785 and z=1.956 respectively), both of which show extended X-ray emissio…
Fe emission and ionized excess absorption in the luminous quasar 3C109 with XMM-Newton
G. Miniutti, D. R. Ballantyne, S. W. Allen +2
We report results from an XMM-Newton observation of the broad-line radio galaxy 3C109 (z=0.3056). Confirming previous results, an Fe emission line is detected, possibly comprising…
The magnetic nature of disk accretion onto black holes
J. M. Miller, J. Raymond, A. C. Fabian +5
Although disk accretion onto compact objects - white dwarfs, neutron stars, and black holes - is central to much of high energy astrophysics, the mechanisms which enable this proce…
Resonance scattering, absorption and off-centre abundance peaks in clusters of galaxies
J. S. Sanders, A. C. Fabian
A possible explanation for the central abundance dips found from spatially-resolved X-ray spectroscopy of several groups and clusters of galaxies is resonance scattering. A number…
Effects of sedimented helium on the X-ray properties of galaxy clusters
S. Ettori, A. C. Fabian
In this Letter, we consider the role played by the sedimentation of helium nuclei on the emissivity and metallicity distribution of the X-ray emitting plasma in the cores of relaxe…
Cold molecular gas in the Perseus cluster core - Association with X-ray cavity, Halpha filaments and cooling flow -
P. Salome, F. Combes, A. C. Edge +7
Cold molecular gas has been recently detected in several cooling flow clusters of galaxies where huge optical nebulosities often stand. These optical filaments are tightly linked t…
Galaxy cluster mass profiles
L. M. Voigt, A. C. Fabian
Accurate measurements of the mass distribution in galaxy and cluster halos are essential to test the cold dark matter (CDM) paradigm. The cosmological model predicts a universal sh…
OVI Observations of Galaxy Clusters: Evidence for Modest Cooling Flows
Joel N. Bregman, A. C. Fabian, Eric D. Miller +1
A prediction of the galaxy cluster cooling flow model is that as gas cools from the ambient cluster temperature, emission lines are produced in gas at subsequently decreasing tempe…
X-ray spectral properties of high-redshift radio-loud quasars beyond redshift 4--first results
W. Yuan, A. C. Fabian, M. A. Worsley +1
(abridged) We firstly present the results of X-ray spectroscopic observations with XMM-Newton for four high-redshift radio-loud quasars at z>4. These observations more than double…
XMM-Newton study of the complex and variable spectrum of NGC 4051
G. Ponti, G. Miniutti, M. Cappi +3
We study the X-ray spectral variability of the Narrow Line Seyfert 1 galaxy NGC 4051 as observed during two XMM-Newton observations. The data show evidence for a neutral and consta…