论文标题
气体含量调节星系中恒星形成和黑洞积聚的生命周期
Gas Content Regulates the Lifecycle of Star Formation and Black Hole Accretion in Galaxies
论文作者
论文摘要
活跃的银河核（AGN）反馈有望通过防止外部气体流入或改变气体的热力学状态来驱动强银河风，从而影响星系中的冷气数量。我们使用基于粉尘吸收（H $α$/H $β$）的分子气体质量估计来研究与非活动星系相比，2型AGN宿主星系的大样本的气体含量。 Using sparse principal component and clustering analysis, we analyze a suite of stellar and structural parameters of $\sim 27,100$ face-on, central galaxies at redshift $z = 0.02-0.15$ and with stellar mass $M_\star \approx 10^{10}-2\times 10^{11}\,M_\odot$.我们确定了四个类似质量和形态的星系组（质量表面密度，速度分散，浓度和Sérsic指数），它们可以通过生命周期在其中进化相关，其中气体含量介导了其气体含量介导其星形形成率（SFR）和AGN活性水平。星系首先通过爆发恒星形成消耗其气体，然后进入中间气体丰富度的过渡阶段，在该阶段中，星形形成和AGNS并存，然后作为毒气贫乏的退休，静态系统，具有残留的AGN活性水平（LINERS）。强烈积聚黑洞（Seyferts）生活在气体富含气体的宿主中，但它们的气体储层和形成恒星的能力似乎都受到了\ emph {in emph {nistcales $ \ lyssim 0.5 $ \，gyr，gyr，gyr，gyr，gyr）。我们的结果与AGN反馈模型不一致，该模型预测，与具有相似质量，形态学和SFR的非活性星系相比，大型星系中的中央，隆起的，类似于Seyfert的AGN具有明显较低的分子气体分数。
Active galactic nucleus (AGN) feedback is expected to impact the amount of cold gas in galaxies by driving strong galactic winds, by preventing external gas inflows, or by changing the thermodynamical state of the gas. We use molecular gas mass estimates based on dust absorption (H$α$/H$β$) to study gas content of large samples of type 2 AGN host galaxies in comparison with inactive galaxies. Using sparse principal component and clustering analysis, we analyze a suite of stellar and structural parameters of $\sim 27,100$ face-on, central galaxies at redshift $z = 0.02-0.15$ and with stellar mass $M_\star \approx 10^{10}-2\times 10^{11}\,M_\odot$. We identify four galaxy groups of similar mass and morphology (mass surface density, velocity dispersion, concentration, and Sérsic index) that can be evolutionarily linked through a lifecycle wherein gas content mediates their star formation rate (SFR) and level of AGN activity. Galaxies first consume their gas mostly through bursty star formation, then enter into a transition phase of intermediate gas richness in which star formation and AGNs coexist, before settling into retirement as gas-poor, quiescent systems with residual levels of AGN activity (LINERs). Strongly accreting black holes (Seyferts) live in gas-rich, star-forming hosts, but neither their gas reservoir nor their ability to form stars seem to be impacted \emph{instantaneously} (timescales $\lesssim 0.5$\,Gyr) by AGN feedback. Our results are inconsistent with AGN feedback models that predict that central, bulge-dominated, Seyfert-like AGNs in massive galaxies have significantly lower molecular gas fractions compared to inactive galaxies of similar mass, morphology, and SFR.
