453 citations · 3.3k across the 50 of their papers we have counts for
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The role of relativistic jets in the heaviest and most active supermassive black holes at high redshift
G. Ghisellini, F. Haardt, R. Della Ceca +2
In powerful radio-quiet active galactic nuclei (AGN), black holes heavier than one billion solar masses form at a redshift ~1.5-2. Supermassive black holes in jetted radio-loud AGN…
The XMM-Newton Wide Angle Survey (XWAS)
P. Esquej, M. Page, F. J. Carrera +16
This programme is aimed at obtaining one of the largest X-ray selected samples of identified active galactic nuclei to date in order to characterise such a population at intermedia…
Black-hole masses of type 1 AGN in the XMM-Newton bright serendipitous survey
A. Caccianiga, R. Fanali, P. Severgnini +3
We derive masses of the central super-massive black hole (SMBH) and accretion rates for 154 type1 AGN belonging to a well-defined X-ray-selected sample, the XMM-Newton Serendipitou…
A new technique to efficiently select Compton-thick AGN
P. Severgnini, A. Caccianiga, R. Della Ceca
We present a new efficient diagnostic method, based on mid-infrared and X-ray data, to select local (z<0.1) Compton-thick (CT) AGN with the aim of estimating their surface and spac…
NGC454: unveiling a new "changing look" AGN
Elena Marchese, Valentina Braito, Roberto Della Ceca +2
We present a detailed analysis of the X-ray spectrum of the Seyfert 2 galaxy NGC454E, belonging to the interacting system NGC454. Observations performed with Suzaku, XMM-Newton and…
The optical-UV spectral energy distribution of the unabsorbed AGN population in the XMM-Newton Bright Serendipitous Survey
E. Marchese, R. Della Ceca, A. Caccianiga +3
Active galactic nuclei (AGN) emit radiation over a wide range of wavelengths, with a peak of emission in the far-UV region of the electromagnetic spectrum, a spectral region that i…
The X-ray spectral properties of the AGN population in the XMM-Newton bright serendipitous survey
A. Corral, R. Della Ceca, A. Caccianiga +5
We present here a detailed X-ray spectral analysis of the AGN belonging to the XMM-Newton bright survey (XBS) that comprises more than 300 AGN up to redshift ~ 2.4. We performed an…
Suzaku and SWIFT-BAT observations of a newly discovered Compton-thick AGN
P. Severgnini, A. Caccianiga, R. Della Ceca +4
Obscured AGN are fundamental to understand the history of Super Massive Black Hole growth and their influence on galaxy formation. However, the Compton-thick AGN (NH>1e24 cm^-2) po…
High redshift Fermi blazars
G. Ghisellini, G. Tagliaferri, L. Foschini +6
With the release of the first year Fermi catalogue, the number of blazars detected above 100 MeV lying at high redshift has been largely increased. There are 28 blazars at z>2 in t…
Overview of EXIST mission science and implementation
J. Grindlay, N. Gehrels, J. Bloom +14
The Energetic X-ray Imaging Survey Telescope (EXIST) is designed to i) use the birth of stellar mass black holes, as revealed by cosmic Gamma-Ray Bursts (GRBs), as probes of the ve…
Revealing the First Stellar and Supermassive Black Holes to EXIST
J. Grindlay, J. Bloom, P. Coppi +8
The epochs of origin of the first stars and galaxies, and subsequent growth of the first supermassive black holes, are among the most fundamental questions. Observations of the hig…
The EXIST view of Super-Massive Black Holes in the Universe
Roberto Della Ceca, Gabriele Ghisellini, Gianpiero Tagliaferri +9
With its large collection area, broad-band energy coverage from optical/NIR (0.3 to 2.2 micron) to soft/hard X-ray (0.1-600 keV), all-sky monitoring capability, and on-board follow…
GALEX measurements of the Big Blue Bump as a tool to study bolometric corrections in AGNs
Elena Marchese, R. Della Ceca, A. Caccianiga +2
Active Galactic Nuclei emit over the entire electromagnetic spectrum with the peak of the accretion disk emission in the far-UV, a wavelength range historically difficult to invest…
Heavily obscured AGN in the local Universe
P. Severgnini, A. Caccianiga, R. Della Ceca +4
We present here a new powerful diagnostic plot to select heavily obscured AGN in the local universe by combining infrared (Spitzer, IRAS) and X-ray (XMM) information. On the basis…