A
Andrea Comastri
Researcher at INAF
Publications - 718
Citations - 52821
Andrea Comastri is an academic researcher from INAF. The author has contributed to research in topics: Galaxy & Active galactic nucleus. The author has an hindex of 111, co-authored 706 publications receiving 49119 citations. Previous affiliations of Andrea Comastri include University of Bologna & Max Planck Society.
Papers
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BeppoSAX/PDS identification of the true counterpart of the Piccinotti source H0917-074
Angela Malizia,G. Malaguti,L. Bassani,Massimo Cappi,Andrea Comastri,G. Di Cocco,Eliana Palazzi,Cristian Vignali +7 more
TL;DR: In this paper, high energy emission has been discovered serendipitously by the BeppoSAX/PDS telescope in the ~1.3 degree field of view around the Piccinotti source H0917-074.
D ec 1 99 7 1 1 H 0419-577 : A TWO-STATE SEYFERT GALAXY ?
TL;DR: In this article , preliminary results of the BeppoSAX observation of the radio-quiet AGN 1H0419-577 are presented, showing that despite its broad line optical spectrum, the intermediate X-ray spectrum (i.e. 2 − 10 keV) is flatter than typically observed in Seyfert 1s and no iron line is significantly detected.
Posted Content
Extended X-ray emission from FRIIs and RL quasars
TL;DR: In this paper, it was shown that detectable fluxes of X-rays are produced by inverse Compton scattering of nuclear photons with the relativistic electrons in the radio lobes of strong FRII radio galaxies within the FRII-RL quasar unification scheme.
Posted Content
Optically dim counterparts of hard X-ray selected AGNs
Roberto Maiolino,M. Salvati,L. A. Antonelli,Andrea Comastri,Fabrizio Fiore,Francesca Ghinassi,Roberto Gilli,F. La Franca,F. Mannucci,Guido Risaliti,D. Thompson,C. Vignali +11 more
TL;DR: In this paper, the authors present near-IR photometry and imaging observations of a small sample of sources identified in the BeppoSAX 5-10 keV survey (HELLAS) which resolves ~ 20-30% of the X-ray background at these energies.
Journal ArticleDOI
X-ray properties and obscured fraction of AGN in the J1030 Chandra field
Matilde Signorini,Stefano Marchesi,Roberto Gilli,Marcella Brusa,Andrea Comastri,Q. D'Amato,Kazushi Iwasawa,Giorgio Lanzuisi,Giovanni Luigi Mazzolari,M. Mignoli,Alessandro Peca,Isabella Prandoni,Paolo Tozzi,Cristian Vignali,Fabio Vito,Colin Norman +15 more
TL;DR: In this paper , the authors performed a thorough X-ray spectral analysis for each object in the sample, measuring its nuclear column density and intrinsic (de-absorbed) 2-10 keV rest-frame luminosity, and corrected for selection effects to recover the intrinsic obscured fractions.