Multi-wavelength Properties of Type 1 and Type 2 AGN Host Galaxies in the Chandra-COSMOS Legacy Survey
Multi-wavelength Properties of Type 1 and Type 2 AGN Host Galaxies in the Chandra-COSMOS Legacy Survey
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DOI：
10.3847/1538-4357/ab01fb
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发表时间：
2019-02
期刊：
影响因子：
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通讯作者：
H. Suh;F. Civano;G. Hasinger;E. Lusso;S. Marchesi;A. Schulze;M. Onodera;D. Rosario;D. Sanders
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文献类型：
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作者：
H. Suh;F. Civano;G. Hasinger;E. Lusso;S. Marchesi;A. Schulze;M. Onodera;D. Rosario;D. Sanders
我们调查了Chandra-COSMOS遗产巡天中3701个X射线选择的活动星系核（AGN）的宿主星系的多波长特性。得益于COSMOS领域广泛的多波长测光，我们通过多分量SED拟合技术推导出AGN光度、宿主恒星质量和星星形成率（SFR）。第1型和第2型活动星系核遵循相同的本征L2-10 keV-L 6 μm关系，这表明中红外辐射是一个相当好的度量活动星系核吸积功率的方法，而不考虑遮蔽。我们发现，有一个强烈的增加，在1型活动星系核的分数向更高的活动星系核光度，可能是由于这样的事实，即1型活动星系核往往是由更大的星系。活动星系核的光度和SFR是一致的增加向高质量的恒星，而Mstellar的依赖性是弱的向高质量的结束，这可以解释为淬火的结果都星星形成和活动星系核活动在大质量星系。活动星系核的宿主星系倾向于具有与正常恒星形成星系一致的SFR，而与活动星系核的光度无关。我们证实，黑洞吸积率和SFR相关的z <$5，当形成恒星。大部分（约73%）的活动星系核在远红外波段是暗淡的，这意味着中等光度的活动星系核在星星形成受到抑制后仍然是活跃的。活动星系核的活动是否对星星的形成起到了淬灭作用，目前还不确定。我们的结论是活动星系核的活动和星星的形成可能更根本地与宿主恒星的质量。
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 L2–10 keV–L6 μm 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 the Mstellar dependence is weaker toward 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.