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Chasing the observational signatures of seed black holes at z > 7: candidate statistics
Rosa Valiante, Raffaella Schneider, Luca Graziani +1
Supermassive black holes (SMBHs) of 10^9-10^10 Msun were already in place ~13 Gyr ago, at z>6. Super-Eddington growth of low-mass BH seeds (~100 Msun) or less extreme accretion ont…
The NuSTAR Extragalactic Survey: Average broad-band X-ray spectral properties of the NuSTAR detected AGN
A. Del Moro, D. M. Alexander, J. A. Aird +18
We present a study of the average X-ray spectral properties of the sources detected by the NuSTAR extragalactic survey, comprising observations of the E-CDFS, EGS and COSMOS fields…
The NuSTAR Serendipitous Survey: Hunting for The Most Extreme Obscured AGN at >10 keV
G. B. Lansbury, D. M. Alexander, J. Aird +27
We identify sources with extremely hard X-ray spectra (i.e., with photon indices of Gamma<0.6 in the 13 sq. deg. NuSTAR serendipitous survey, to search for the most highly obscured…
The WISSH quasars Project: II. Giant star nurseries in hyper-luminous quasars
F. Duras, A. Bongiorno, E. Piconcelli +12
Studying the coupling between the energy output produced by the central quasar and the host galaxy is fundamental to fully understand galaxy evolution. Quasar feedback is indeed su…
X-ray spectroscopy of the z=6.4 quasar J1148+5251
Simona Gallerani, Luca Zappacosta, Maria Carmela Orofino +9
We present the 78-ks Chandra observations of the quasar SDSS J1148+5251. The source is clearly detected in the energy range 0.3-7 keV with 42 counts (with a significance $\…
AGN wind scaling relations and the co-evolution of black holes and galaxies
F. Fiore, C. Feruglio, F. Shankar +14
Feedback from accreting SMBHs is often identified as the main mechanism responsible for regulating star-formation in AGN host galaxies. However, the relationships between AGN activ…