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The origin of the cosmic X-ray background T Shanks, I Georgantopoulos, GC Stewart, KA Pounds, BJ Boyle, ... Nature 353 (6342), 315-320, 1991 | 225 | 1991 |
A deep ROSAT survey – I. The QSO X-ray luminosity function BJ Boyle, RE Griffiths, T Shanks, GC Stewart, I Georgantopoulos Monthly Notices of the Royal Astronomical Society 260 (1), 49-58, 1993 | 211 | 1993 |
The XMM Deep survey in the CDF-S-I. First results on heavily obscured AGN A Comastri, P Ranalli, K Iwasawa, C Vignali, R Gilli, I Georgantopoulos, ... Astronomy & Astrophysics 526, L9, 2011 | 186 | 2011 |
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Constraining the fraction of Compton-thick AGN in the Universe by modelling the diffuse X-ray background spectrum A Akylas, A Georgakakis, I Georgantopoulos, M Brightman, K Nandra Astronomy & Astrophysics 546, A98, 2012 | 147 | 2012 |
GOODS-Herschel: ultra-deep XMM-Newton observations reveal AGN/star-formation connection E Rovilos, A Comastri, R Gilli, I Georgantopoulos, P Ranalli, C Vignali, ... Astronomy & Astrophysics 546, A58, 2012 | 136 | 2012 |
XMM-Newton and Chandra measurements of the AGN intrinsic absorption: dependence on luminosity and redshift A Akylas, I Georgantopoulos, A Georgakakis, S Kitsionas, ... Astronomy & Astrophysics 459 (3), 693-701, 2006 | 127 | 2006 |
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The X-ray luminosity function of active galactic nuclei in the redshift interval z=3-5 A Georgakakis, J Aird, J Buchner, M Salvato, ML Menzel, WN Brandt, ... Monthly Notices of the Royal Astronomical Society 453 (2), 1946-1964, 2015 | 113 | 2015 |
The X-ray spectra of optically selected Seyfert 2 galaxies: are there any Seyfert 2 galaxies with no absorption? A Pappa, I Georgantopoulos, GC Stewart, AL Zezas Monthly Notices of the Royal Astronomical Society 326 (3), 995-1006, 2001 | 112 | 2001 |
ROSAT and ASCA observations of X-ray luminous starburst galaxies: NGC 3310 and 3690 AL Zezas, I Georgantopoulos, MJ Ward Monthly Notices of the Royal Astronomical Society 301 (4), 915-925, 1998 | 112 | 1998 |
Compton thick AGN in the XMM-COSMOS survey G Lanzuisi, P Ranalli, I Georgantopoulos, A Georgakakis, I Delvecchio, ... Astronomy & Astrophysics 573, A137, 2015 | 111 | 2015 |
XMM-Newton observations of Seyfert galaxies from the Palomar spectroscopic survey: the X-ray absorption distribution A Akylas, I Georgantopoulos Astronomy & Astrophysics 500 (3), 999-1012, 2009 | 107 | 2009 |
The XMM deep survey in the CDF-S-III. Point source catalogue and number counts in the hard X-rays P Ranalli, A Comastri, C Vignali, FJ Carrera, N Cappelluti, R Gilli, ... Astronomy & Astrophysics 555, A42, 2013 | 95 | 2013 |
Searching for cluster substructure using APM and ROSAT data V Kolokotronis, S Basilakos, M Plionis, I Georgantopoulos Monthly Notices of the Royal Astronomical Society 320 (1), 49-60, 2001 | 94 | 2001 |
X-ray variability in a deep, flux-limited sample of QSOs O Almaini, A Lawrence, T Shanks, A Edge, BJ Boyle, I Georgantopoulos, ... Monthly Notices of the Royal Astronomical Society 315 (2), 325-336, 2000 | 92 | 2000 |
The XMM deep survey in the CDF-S-II. A 9–20 keV selection of heavily obscured active galaxies at z> 1.7 K Iwasawa, R Gilli, C Vignali, A Comastri, WN Brandt, P Ranalli, F Vito, ... Astronomy & Astrophysics 546, A84, 2012 | 84 | 2012 |