Search Publications
Statistics of relativistically broadened Fe Kα lines in AGN
Bianchi, S.; Guainazzi, M.; Dovčiak, M.
We present preliminary results on the properties of relativistically broadened Fe Kα lines in a collection of more then 100 Active Galactic Nuclei (AGN) observed by the XMM-Newton EPIC-pn camera. Our main conclusions can be summarized as follows: a) we detect broad lines in about 25% of the sample objects. This fraction increases to 42 ± 13 % if w…
Relativistic blue- and red-shifted absorption lines in AGNs
Cappi, M.
Current, accumulating evidence for (mildly) relativistic blue- and red-shifted absorption lines in AGNs is reviewed. XMM-Newton and Chandra sensitive X-ray observations are starting to probe not only the kinematics (velocity) but also the dynamics (accelerations) of highly ionized gas flowing in-and-out from, likely, a few gravitational radii from…
Suzaku observations of iron lines and reflection in AGN
Kataoka, J.; Fabian, A. C.; Takahashi, T. +8 more
Initial results on the iron K-shell line and reflection component in several AGN observed as part of the Suzaku Guaranteed Time program are reviewed. This paper discusses a small sample of Compton-thin Seyferts observed to date with Suzaku; namely MCG -5-23-16, MCG -6-30-15, NGC 4051, NGC 3516, NGC 2110, 3C 120 and NGC 2992. The broad iron K\alpha…
An XMM-Newton survey of broad iron lines in AGN
Nandra, K.; Turner, T. J.; Reeves, J. N. +2 more
We report on the iron Kα line properties of a sample of Seyfert galaxies observed with the XMM-Newton EPIC pn instrument. Using a systematic and uniform analysis, we find that complexity at iron-K is extremely common in the XMM-Newton spectra. Once appropriate soft X-ray absorption, narrow 6.4 keV emission and associated Compton reflection are acc…
New radio halos and relics in clusters of galaxies
Govoni, F.; Giovannini, G.; Pizzo, R. +2 more
We present here new images of relics and halo sources in rich cluster of galaxies and the correlation between the halo radio surface brightness versus the cluster bolometric X-ray luminosity.
A short review of relativistic iron lines from stellar-mass black holes
Miller, J. M.
% In this contribution, I briefly review recent progress in detecting and measuring the properties of relativistic iron lines observed in stellar-mass black hole systems, and the aspects of these lines that are most relevant to studies of similar lines in Seyfert-1 AGN. In particular, the lines observed in stellar-mass black holes are not complica…
Diffuse radio sources in groups and poor clusters
Rudnick, L.; Delain, K. M.
We have discovered new diffuse radio sources likely associated with groups of galaxies at low redshift (0.01-0.04) and without apparent AGN by using the WENSS and WISH catalogs to perform an unbiased survey. These sources resemble the radio halos, mini-halos, and `relics' of rich clusters, which are thought to be powered by shocks and turbulence f…
The iron emission line complex of MCG-5-23-16: the long XMM-Newton look
Ptak, A.; Nandra, K.; Turner, T. J. +9 more
We present the results of the simultaneous XMM-Newton and Chandra observations of the bright Seyfert 1.9 galaxy MCG-5-23-16, which is one of the best known examples of a relativistically broadened iron K\alpha line. We find that: a) the soft X-ray emission is likely to be dominated by photoionized gas, b) the complex iron emission line is best mod…
Light bending models in AGNs
Miniutti, G.
We review the MCG-6-30-15 observations and results that provided the motivation for the light bending model. We present a summary of the main properties of the model and discuss its application to MCG-6-30-15 briefly mentioning other X-ray sources showing the same qualitative behaviour. Finally, we report on one of the most spectacular cases so fa…
An ionized disc reflection component for the X-ray spectrum of NGC 4051 and IRAS13224-3809?
Cappi, M.; Ponti, G.; Fabian, A. C. +2 more
A spectral variability study of the two Narrow Line Seyfert 1 galaxies NGC 4051 and IRAS13224-3809 is presented. Both sources show a high degree of flux and spectral variability. The nuclear emission, lightly absorbed by warm material, has been decomposed into a direct power law emission and an ionized disc reflection plus constant emission from d…