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Georgakakis, A. ; Rowan-Robinson, M. ; Nandra, K. ; Digby-North, J. ; Pérez González, Pablo Guillermo ; Barro, G. | Wiley | 2010-07-21We explore the nature of Infrared Excess sources (IRX), which are proposed as candidates for luminous [L_X(2–10 keV) > 10^43 erg s^?1] Compton thick (NH > 2 × 1024 cm?2) QSOs at z? 2. Lower redshift, z? 1, analogues of the distant IRX populati[...]texto impreso
Georgakakis, A. ; Pérez González, Pablo Guillermo ; Fanidakis, N. ; Salvato, M. ; Aird, J. ; Messias, H. ; Lotz, J. M. ; Barro, Guillermo ; Hsu, Li-Ting ; Nandra, K. ; Rosario, D. ; Cooper, M. C. ; Kocevski, D. D. ; Newman, J. A. | Wiley | 2014-05Chandra data in the COSMOS, AEGIS-XD and 4 Ms Chandra Deep Field South are combined with multiwavelength photometry available in those fields to determine the rest-frame U ? V versus V ? J colours of X-ray AGN hosts in the redshift intervals 0.1[...]texto impreso
Georgakakis, A. ; Mountrichas, G. ; Salvato, M ; Rosario, D. ; Pérez González, Pablo Guillermo ; Lutz, D. ; Nandra, K. ; Coil, A. ; Cooper, M. C. ; Newman, J. A. ; Berta, S. ; Magnelli, B. ; Popesso, P. ; Pozzi, F. | Wiley | 2014-10-01We combine multi-wavelength data in the AEGIS-XD and C-COSMOS surveys to measure the typical dark matter halo mass of X-ray selected active galactic nuclei (AGN) [L_X(2–10?keV) > 10^42?erg?s^? 1] in comparison with far-infrared selected star-fo[...]texto impreso
Aird, J. ; Coil, A. L. ; Georgakakis, A. ; Nandra, K. ; Barro, G. ; Pérez González, Pablo Guillermo | Wiley | 2015-07-01We present new measurements of the evolution of the X-ray luminosity functions (XLFs) of unabsorbed and absorbed active galactic nuclei (AGNs) out to z ~ 5. We construct samples containing 2957 sources detected at hard (2-7 keV) X-ray energies a[...]
