On the dust and gas content of high-redshift galaxies hosting obscured AGN in the CDF-S

D'Amato Quirino
2019 Zenodo  
Submillimeter Galaxies (SMGs) at high redshift are among the best targets to investigate the early evolutionary phases in the lifetime of massive systems, during which large gas reservoirs sustain vigorous star formation and efficiently feed the central, buried Super Massive Black Hole (SMBH). I present the analysis of new ALMA band 4 (1.8-2.4 mm) continuum and high-J CO observation of six obscured QSOs (log N_H > 23) hosted by SMGs at z > 2.5 in the 7 Ms Chandra Deep Field South (CDF-S). Sizes
more » ... outh (CDF-S). Sizes and masses of the galaxies are measured to estimate to which extent the host ISM may contribute to the nuclear absorption. We found that at high redshift the galaxy ISM can substantially contribute to the AGN obscuration up to the Compton-thick (10^24 cm^-2) regime. In addition, we found that all the detected sources show a velocity gradient possibly ascribed to a rotating system, even though two of them could be even associated with a chaotic, possibly merging, structure.
doi:10.5281/zenodo.3555371 fatcat:2eo6ffleybhpbfyzqwgr3bzzl4