论文标题
主动银河核在大规模星系中淬灭大型星系中的作用
The Role of Active Galactic Nuclei in the Quenching of Massive Galaxies in the SQuiGGLE Survey
论文作者
论文摘要
我们研究了从Sloan数字天空调查中选择的Z〜0.7大量大量大规模八角形星系中核活动的发生率，并根据无线电连续体和光学发射线鉴定活跃的银河核。在我们的质量范围为10^10.6-10^11.5 MSUN中，无线电活动的发生率微弱地取决于恒星质量和独立于恒星年龄，而无线电发光度在很大程度上取决于恒星质量。光学核活动的发生率最大取决于DN4000线指数，该指数是恒星年龄的代理，其活跃分数在最年轻的恒星后星系中高约十倍。由于年龄和分子气体分数之间也看到了类似的趋势，因此我们认为，与当地星系一样，年龄趋势反映了可用加油的峰值，而不是周围星系中的中央黑洞的反馈。
We study the incidence of nuclear activity in a large sample of massive post-starburst galaxies at z~0.7 selected from the Sloan Digital Sky Survey, and identify active galactic nuclei based on radio continuum and optical emission lines. Over our mass range of 10^10.6-10^11.5 Msun, the incidence of radio activity is weakly dependent on stellar mass and independent of stellar age, while radio luminosity depends strongly on stellar mass. Optical nuclear activity incidence depends most strongly on the Dn4000 line index, a proxy for stellar age, with an active fraction that is ~ten times higher in the youngest versus oldest post-starburst galaxies. Since a similar trend is seen between age and molecular gas fractions, we argue that, like in local galaxies, the age trend reflects a peak in available fueling rather than feedback from the central black hole on the surrounding galaxy.
