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

Understand

Obscured AGN represent a significant fraction of the entire AGN population, especially at high redshift (~70% at z=3--5).

• They are often characterized by the presence of large gas and dust reservoirs that are thought to sustain and possibly obscure vigorous star formation processes that make these objects shine at far-IR and sub-mm wavelengths.
• We exploit ALMA Cycle 4 observations of the continuum (~2.1mm) and high-J CO emission of a sample of six X-ray selected SMGs hosting an obscured AGN at z_spec>2.5 in the 7 Ms CDF-S.
• We measured the masses and sizes of the dust and molecular gas and we derived the gas density and column density on the basis of a uniform sphere geometry.