The 700 ks Chandra Spiderweb Field I: evidence for widespread nuclear activity in the Protocluster (2203.02208v2)
Abstract: (Abridged) We present an analysis of the 700 ks Chandra ACIS-S observation of the field around the Spiderweb Galaxy at z=2.156, focusing on the nuclear activity in the associated large-scale environment. We identify unresolved X-ray sources down to flux limits of 1.3X10{-16} and 3.9X10{-16} erg/s/cm2 in the soft and hard band, respectively. We search for counterparts in the optical, NIR and submm bands to identify X-ray sources belonging to the protocluster. We detect 107 X-ray unresolved sources within 5 arcmin (corresponding to 2.5 Mpc) of J1140-2629, among which 13 have optical counterparts with spectroscopic redshift 2.11<z\<2.20, and 1 source with photometric redshift consistent with this range. Our X-ray spectral analysis shows that their intrinsic spectral slope is consistent with an average <\Gamma>~1.84+-0.04. The best-fit intrinsic absorption for 5 protocluster X-ray members is N_H>10{23} cm{-2}, while other 6 have upper limits of the order of fewX10{22} cm{-2}. Two sources can only be fitted with very flat \Gamma<=1, and are therefore considered Compton-thick candidates. Their 0.5-10 keV rest frame luminosities are larger than 2X10{43} erg/s, significantly greater than X-ray luminosities expected from star formation activity. The X-ray luminosity function of AGN in the volume associated to the Spiderweb protocluster in the range 10{43}<L_X<10{44.5} erg/s, is at least 10 times higher than that in the field at the same redshift and significantly flatter. The X-ray AGN fraction is measured to be (25.5+-4.5)% in the stellar mass range log(M*/M_sun)>10.5, corresponding to an enhancement of 6.0{+9.0}_{-3.0} with respect to the COSMOS field at comparable redshifts and stellar mass range. We conclude that the galaxy population in the Spiderweb Protocluster is characterized by enhanced X-ray nuclear activity triggered by environmental effects on Mpc scales.