Kavli Affiliate: Jing Wang
| First 5 Authors: Hong Guo, Michael G. Jones, Jing Wang, ,
| Summary:
The growth of supermassive black holes, especially the associated state of
active galactic nuclei (AGNs), is generally believed to be the key step in
regulating star formation in massive galaxies. As the fuel of star formation,
the cold gas reservoir is a direct probe of the effect of AGN feedback on their
host galaxies. However, in observation, no clear connection has been found
between AGN activity and the cold gas mass. In this paper, we find
observational signals of significant depletion of the total neutral hydrogen
gas reservoir in optically-selected type-2 AGN host central galaxies of stellar
mass $10^{9}$–$10^{10}M_odot$. The effect of AGN feedback on the cold gas
reservoir is stronger for higher star formation rates and higher AGN
luminosity. But it becomes much weaker above this mass range, consistent with
previous findings focusing on massive galaxies. Our result suggests that
low-mass and gas-rich AGN host central galaxies would first form dense cores
before AGN feedback is triggered, removing their neutral hydrogen gas. More
massive central galaxies may undergo a significantly different formation
scenario by gradually building up dense cores with less effective and recurrent
AGN feedback.
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