论文标题
低质量和高质量中央星系的冷气储藏在对活性银河核反馈的响应中有所不同
Cold Gas Reservoirs of Low- and High-mass Central Galaxies Differ in Response to Active Galactic Nucleus Feedback
论文作者
论文摘要
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.作为恒星形成的燃料，冷气储层是对AGN反馈对宿主星系的影响的直接探测。但是，在观察中，AGN活性与冷气质量之间没有明确的联系。在本文中，我们发现在光学选择的2型AGN宿主恒星质量$ 10^{9} $ - $ 10^{10} {10} m_ \ odot $中，在光学选择的2型AGN宿主中心星系中，总中性氢气库有明显耗竭的观察信号。对于更高的恒星形成速率和更高的AGN发光度，AGN反馈对冷气储层的影响更强。但是，它比以前的发现集中在大规模星系上的发现相当弱了。我们的结果表明，在触发AGN反馈之前，低质量和气体富含AGN的中央星系将首先形成致密的核心，从而去除其中性氢气。更大的中央星系可能会通过逐渐建立效率较低和反复发作的AGN反馈来逐渐建立密集的核心，从而经历明显不同的地层情况。
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.
