G
G. C. Perola
Researcher at Sapienza University of Rome
Publications - 75
Citations - 2632
G. C. Perola is an academic researcher from Sapienza University of Rome. The author has contributed to research in topics: Galaxy & Polarimeter. The author has an hindex of 25, co-authored 74 publications receiving 2563 citations.
Papers
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Journal ArticleDOI
The HELLAS2XMM survey. VII. The hard X-ray luminosity function of AGN up to z=4: more absorbed AGN at low luminosities and high redshifts
F. La Franca,Fabrizio Fiore,Andrea Comastri,G. C. Perola,N. Sacchi,Marcella Brusa,F. Cocchia,Chiara Feruglio,Giorgio Matt,C. Vignali,N. Carangelo,Paolo Ciliegi,A. Lamastra,Roberto Maiolino,M. Mignoli,S. Molendi,Simonetta Puccetti +16 more
TL;DR: In this paper, the cosmological evolution of the density of AGN and of their Nh distribution as a function of the unabsorbed 2-10 keV luminosity up to redshift 4.0 was determined.
Journal ArticleDOI
Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. IX. Ultraviolet Observations of Fairall 9
P. M. Rodríguez-Pascual,Danielle Alloin,J. Clavel,D. M. Crenshaw,Keith Horne,Gerard A. Kriss,Julian H. Krolik,M. A. Malkan,Hagai Netzer,P. T. O'Brien,Bradley M. Peterson,Gail A. Reichert,Willem Wamsteker,Tal Alexander,P. Barr,Roger Blandford,Joel N. Bregman,T. E. Carone,S. D. Clements,Thierry J.-L. Courvoisier,M. M. De Robertis,M. Dietrich,Horacio Alberto Dottori,Rick Edelson,Alexei V. Filippenko,C. M. Gaskell,John P. Huchra,J. B. Hutchings,Wolfram Kollatschny,Anuradha Koratkar,Kirk T. Korista,Ari Laor,Gordon M. MacAlpine,Peter G. Martin,D. Maoz,B. McCollum,Simon L. Morris,G. C. Perola,Richard W. Pogge,Roger Ptak,M. C. Recondo‐Gonzalez,J. M. Rodriguez‐Espinoza,E. L. Rokaki,Maria Santos-Lleo,Kazuhiro Sekiguchi,J. M. Shull,M. A. J. Snijders,Linda S. Sparke,G. M. Stirpe,R. Stoner,Wei-Hsin Sun,Stefan Wagner,Ignaz Wanders,Belinda Jane Wilkes,Claudia Winge,W. Zheng +55 more
TL;DR: In this article, an 8-month monitoring campaign on the Seyfert 1 galaxy Fairall 9 has been conducted with the International Ultraviolet Explorer in an attempt to obtain reliable estimates of continuum-continuum and continuum-emission-line delays for a high-luminosity active galactic nucleus (AGN).
Journal ArticleDOI
Multiwavelength Observations of Short-Timescale Variability in NGC 4151. IV. Analysis of Multiwavelength Continuum Variability
Rick Edelson,Tal Alexander,D. M. Crenshaw,Shai Kaspi,M. A. Malkan,Bradley M. Peterson,R. S. Warwick,J. Clavel,Alexei V. Filippenko,Keith Horne,Kirk T. Korista,Gerard A. Kriss,Julian H. Krolik,D. Maoz,K. Nandra,P. T. O'Brien,Steve Penton,Tahir Yaqoob,P. Albrecht,Danielle Alloin,Thomas R. Ayres,Thomas J. Balonek,P. Barr,Aaron J. Barth,R. Bertram,G. E. Bromage,Michael T. Carini,T. E. Carone,FZ Cheng,K. K. Chuvaev,M. Dietrich,D DultzinHacyan,C. M. Gaskell,Ian S. Glass,Goad,S Hemar,LC Ho,John P. Huchra,J. B. Hutchings,W. N. Johnson,Demos Kazanas,Wolfram Kollatschny,A. Koratkar,O Kovo,Ari Laor,Gordon M. MacAlpine,P Magdziarz,Peter G. Martin,Thomas Matheson,B. McCollum,H. R. Miller,Simon L. Morris,V. L. Oknyanskij,Jeffrey Penfold,Enrique Pérez,G. C. Perola,G. Pike,R. W. Pogge,Roger Ptak,BC Qian,M. C. Recondo-Gonzalez,Gail A. Reichert,J. M. Rodriguez-Espinoza,P. M. Rodríguez-Pascual,E. L. Rokaki,J. Roland,A. C. Sadun,I. Salamanca,Maria Santos-Lleo,J. C. Shields,J. M. Shull,DA Smith,S. M. Smith,Maj Snijders,G. M. Stirpe,R. Stoner,Wei-Hsin Sun,M. H. Ulrich,E vanGroningen,Robert Wagner,Stephan Wagner,Ignaz Wanders,W. F. Welsh,Ray J. Weymann,Belinda Jane Wilkes,H Wu,J Wurster,SJ Xue,A. A. Zdziarski,W. Zheng,ZL Zou +90 more
TL;DR: In this article, the authors combine data from the three preceding papers in order to analyze the multi wave-band variability and spectral energy distribution of the Seyfert 1 galaxy NGC 4151 during the 1993 December monitoring campaign.
Journal ArticleDOI
The X-ray afterglow of the Gamma-ray burst of May 8, 1997: spectral variability and possible evidence of an iron line
L. Piro,E. Costa,M. Feroci,F. Frontera,Lorenzo Amati,D. Dal Fiume,L. A. Antonelli,John Heise,J. J. M. in 't Zand,Alan Owens,A. N. Parmar,G. Cusumano,M. Vietri,G. C. Perola +13 more
TL;DR: In this paper, the authors reported the possible detection of redshifted Fe iron line emission in the X-ray afterglow of Gamma-ray burst GRB970508 observed by BeppoSAX.
Journal ArticleDOI
Testing Comptonisation models using BeppoSAX observations of Seyfert 1 galaxies
P.-O. Petrucci,Francesco Haardt,L. Maraschi,Paola Grandi,Julien Malzac,Giorgio Matt,Fabrizio Nicastro,L. Piro,G. C. Perola,A. de Rosa +9 more
TL;DR: In this paper, the authors used high quality BeppoSAX data of 6 Seyfert galaxies to test realistic thermal Comptonization models, taking into account the anisotropy of the soft photon field.