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
More filters
Journal ArticleDOI
The WISSH Quasars Project IV. BLR versus kpc-scale winds
G. Vietri,Enrico Piconcelli,M. Bischetti,F. Duras,S. Martocchia,Angela Bongiorno,A. Marconi,Luca Zappacosta,Susanna Bisogni,Gabriele Bruni,Marcella Brusa,Andrea Comastri,Giovanni Cresci,Chiara Feruglio,E. Giallongo,F. La Franca,Vincenzo Mainieri,F. Mannucci,F. Ricci,E. Sani,Vincenzo Testa,Francesco Tombesi,C. Vignali,Fabrizio Fiore +23 more
TL;DR: In this paper, a multi-band observing program aimed at obtaining a complete census of winds in a sample of WISE/SDSS selected hyper-luminous (WISSH) QSOs at z~2-4 was conducted.
Journal ArticleDOI
The X-ray to [Ne V]3426 flux ratio: discovering heavily obscured AGN in the distant Universe
Roberto Gilli,Cristian Vignali,M. Mignoli,Kazushi Iwasawa,Kazushi Iwasawa,Andrea Comastri,G. Zamorani +6 more
TL;DR: In this article, the authors investigated the possibility of using the ratio between the 2−10 keV flux and the [Ne V]3426 emission line flux (X/NeV) as a diagnostic diagram to discover heavily obscured, possibly Compton-thick active galactic nuclei (AGN) in the distant Universe.
Journal ArticleDOI
NuSTAR Unveils a Compton-Thick Type 2 Quasar in MrK 34
Poshak Gandhi,George B. Lansbury,David M. Alexander,Daniel Stern,P. Arévalo,P. Arévalo,David R. Ballantyne,Mislav Baloković,Franz E. Bauer,Franz E. Bauer,Franz E. Bauer,S. E. Boggs,W. N. Brandt,Murray Brightman,Finn Erland Christensen,Andrea Comastri,William W. Craig,William W. Craig,A. Del Moro,Martin Elvis,Andrew C. Fabian,C. J. Hailey,Fiona A. Harrison,Ryan C. Hickox,Michael Koss,Stephanie M. LaMassa,Birong Luo,Birong Luo,Grzegorz Madejski,Andy Ptak,Simonetta Puccetti,Simonetta Puccetti,Stacy H. Teng,C. M. Urry,Dominic J. Walton,William W. Zhang +35 more
TL;DR: NuSTAR 3-40 keV observations of the optically selected Type 2 quasar (QSO2) SDSS J1034+6001 or Mrk 34 were presented in this article.
Journal ArticleDOI
Determining the Covering Factor of Compton-thick Active Galactic Nuclei with NuSTAR
Murray Brightman,Mislav Baloković,Daniel Stern,P. Arévalo,David R. Ballantyne,Franz E. Bauer,Franz E. Bauer,Franz E. Bauer,S. E. Boggs,Walter Craig,Walter Craig,Finn Erland Christensen,Andrea Comastri,Felix Fuerst,Poshak Gandhi,Poshak Gandhi,C. J. Hailey,Fiona A. Harrison,Ryan C. Hickox,Michael Koss,Stephanie M. LaMassa,Simonetta Puccetti,Simonetta Puccetti,E. Rivers,R. V. Vasudevan,Dominic J. Walton,William W. Zhang +26 more
TL;DR: In this article, the authors used the torus models of Brightman & Nandra to predict the X-ray spectrum from reprocessing in a torus and include the Torus opening angle as a free parameter and aim to determine the covering factor of the CT gas in these sources individually.
Journal ArticleDOI
NuSTAR observations of water megamaser AGN
Alberto Masini,Andrea Comastri,Mislav Baloković,I. Zaw,I. Zaw,Simonetta Puccetti,David R. Ballantyne,Franz E. Bauer,S. E. Boggs,W. N. Brandt,M. Brightman,Finn Erland Christensen,Walter Craig,Walter Craig,Poshak Gandhi,Poshak Gandhi,C. J. Hailey,Fiona A. Harrison,Michael Koss,Grzegorz Madejski,Claudio Ricci,E. Rivers,Daniel Stern,William W. Zhang +23 more
TL;DR: In this paper, the authors used a simple analytical model to localize the maser disk and understand its connection with the torus by combining NuSTAR spectral parameters with the available physical quantities from VLBI mapping.