Multi-wavelength Properties of Type 1 and Type 2 AGN Host Galaxies in the Chandra-COSMOS Legacy Survey
2019
We investigate the multi-wavelength properties of host galaxies of 3701 X-ray-selected active galactic nuclei (AGNs) out to z~5 in the Chandra-
COSMOSLegacy Survey. Thanks to the extensive multi-wavelength photometry available in the
COSMOSfield, we derive AGN
luminosities, host
stellar masses, and
star formationrates (SFRs) via a multi-component SED fitting technique. Type 1 and Type 2 AGNs follow the same intrinsic Lx-L6um relation, suggesting that mid-infrared emission is a reasonably good measure of the AGN accretion power regardless of obscuration. We find that there is a strong increase in Type 1 AGN fraction toward higher AGN
luminosity, possibly due to the fact that Type 1 AGNs tend to be hosted by more massive galaxies. The AGN
luminosityand SFR are consistent with an increase toward high
stellar mass, while both the Mstellar-dependence is weaker towards the high-mass end, which could be interpreted as a consequence of quenching both
star formationand AGN activity in massive galaxies. AGN host galaxies tend to have SFRs that are consistent with normal star-forming galaxies, independent of AGN
luminosities. We confirm that black hole accretion rate and SFR are correlated up to z~5, when forming stars. The majority (~73%) of our AGN sample are faint in the far-infrared, implying that the moderate-
luminosityAGNs seem to be still active after the
star formationis suppressed. It is not certain whether AGN activity plays a role in quenching the
star formation. We conclude that both AGN activity and
star formationmight be more fundamentally related to host
stellar mass.
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