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X-ray absorbed QSOs with high SFR at z~2

AutorKhan-Alí, Anuar; Carrera, Francisco J. ; Page, M. J.; Stevens, J. A.; Mateos, Silvia ; Symeonidis, M.
Fecha de publicación2015
CitaciónSXRA 2015
ResumenWe present a detailed investigation of a sample of 5 X-ray and submmluminous QSOs at z~2, when the highest rates of star formation and growth of black holes are known to occur. Hence, they are good laboratories to investigate the co-evolution of star formation and AGN. We analyze here their Spectral Energy Distributions (SEDs), including new PACS and SPIRE Herschel data, together with our existing and archival X-ray-optical-NIR-MIR observations. Both AGN (direct and reprocessed) and Star Formation (SF) emission are needed to model their SEDs. From the SEDs, their UV-optical and X-ray spectra we have estimated the mass of their black holes (MBH ~ 109 - 1010 M) and their intrinsic AGN bolometric luminosities (Lbol ~ 1013 - 1014 L). Their black hole masses are very close to the maximum observed local black hole mass, so they cannot grow much more. These objects show indeed very high Star Formation Rates (SFR ~ 1000 M/yr). From the current SFR and their massive BH, we infer that their host galaxies have to be already quite massive, or they would not have time to reach the local BH-to-bulge mass relation by the present time. Finally, from the SEDs and the X-ray spectra we have found tantalizing evidence for a correlation between the column density of the ionized gas detected in X-rays and the SFR, which would be evidence for a link between AGN and SF processes.
DescripciónResumen del trabajo presentado al Spanish X-ray Astronomy, celebrado en Santander del 3 al 5 de junoio de 2015.
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