C
Cristian Vignali
Researcher at INAF
Publications - 563
Citations - 29577
Cristian Vignali is an academic researcher from INAF. The author has contributed to research in topics: Galaxy & Active galactic nucleus. The author has an hindex of 85, co-authored 529 publications receiving 27128 citations. Previous affiliations of Cristian Vignali include Pennsylvania State University & University of Concepción.
Papers
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Journal ArticleDOI
Yet another UFO in the X-ray spectrum of a high-z lensed QSO
Mauro Dadina,Cristian Vignali,Massimo Cappi,Giorgio Lanzuisi,Gabriele Ponti,Eleonora Torresi,B. De Marco,George Chartas,Margherita Giustini +8 more
TL;DR: In this paper, the authors detected a UFO in a radio-loud quasar at z = 2.64 ks and observed it with XMM-Newton for approximately $78 ks.
Proceedings ArticleDOI
The BeppoSAX HELLAS survey: on the nature of faint hard X-ray selected sources
Fabrizio Fiore,L. A. Antonelli,Paolo Ciliegi,Andrea Comastri,P. Giommi,F. La Franca,Roberto Maiolino,Giorgio Matt,Silvano Molendi,Gc Perola,Cristian Vignali +10 more
TL;DR: The results of the BeppoSAX 4.5-10 keV high energy large area survey as discussed by the authors indicate that the majority of these objects are intermediate objects, i.e. type 1.8-1.9 AGN, red quasars, and even a few broad line, blue continuum quasar, obscured in X-rays by columns of the order of logNH=22.5 -23.5 cm-2.
Journal ArticleDOI
X-ray imaging of the ionisation cones in NGC 5252
Mauro Dadina,Matteo Guainazzi,Massimo Cappi,Stefano Bianchi,Cristian Vignali,G. Malaguti,Andrea Comastri +6 more
TL;DR: In this paper, the X-ray spectrum of the nucleus of NGC 5252 is intrinsically flat and absorbed by neutral gas with a column density N~10$^{22}$ cm$^{-2} ).
Journal ArticleDOI
X-ray spectroscopy of the Compton-thick Seyfert 2 ESO 138-G1
TL;DR: In this article, an analysis of XMM-Newton observations of the Seyfert 2 galaxy ESO 138-G1 (z = 0.0091) reveals a complex spectrum in both its soft and hard portions.
Journal ArticleDOI
Hot-Dust-Poor Type 1 Active Galactic Nuclei in the COSMOS Survey
Heng Hao,Martin Elvis,Francesca Civano,Giorgio Lanzuisi,Giorgio Lanzuisi,Marcella Brusa,Elisabeta Lusso,G. Zamorani,Andrea Comastri,Angela Bongiorno,Chris Impey,Anton M. Koekemoer,Emeric Le Floc'h,Mara Salvato,David B. Sanders,Jonathan R. Trump,Cristian Vignali +16 more
TL;DR: In this paper, a large class of type 1 AGNs with unusually weak near-infrared (1-3m) emission in the XMM-COSMOS type 1 active galactic nuclei was reported.