  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-COSMOS
Legacy Survey. Thanks to the extensive multi-wavelength photometry available in
the COSMOS field, we derive AGN luminosities, host stellar masses, and star
formation rates (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 luminosity and 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 formation and 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-luminosity AGNs seem to be still active after the
star formation is suppressed. It is not certain whether AGN activity plays a
role in quenching the star formation. We conclude that both AGN activity and
star formation might be more fundamentally related to host stellar mass.
