论文标题
条对SDSS螺旋星系的进化的影响
Effect of Bars on Evolution of SDSS Spiral Galaxies
论文作者
论文摘要
我们使用$ 0.020 <z <z <0.055 $，$ m _ {\ rm rm r} <-19.5 $和$σ> 70 \ rm s^rmm km s^{ - 1} $ soptice探索螺旋恒星形成（SF）和AGN活动对螺旋星系进化的重要性和AGN活性。在中央的SF速率为-$σ$平面上，我们分别测量样品中具有较强条的星系的比例，也分别用于禁止禁止的星系的AGN分数。条形和AGN分数之间的比较揭示了SF淬灭和AGN活性的两个现象之间的因果关系。大量的BH和丰富的气体燃料是触发AGN的足够条件。我们推断，通过满足两种条件触发的AGN驱动了强烈的AGN反馈，突然抑制了中央SF并离开SF序列。我们发现，在两种条件中的任何一个都不足够的星系中，条是对AGN触发的极大帮助，加速了整个进化过程，这在伪磅星系中尤为明显。我们所有的发现仅在根据其中央速度分散和中央SFR（不是银河尺度SFR）绘制的情况下才能获得，这表明AGN驱动的SF淬灭被限制在中央KPC区域。
We explore the significance of bars in triggering central star formation (SF) and AGN activity for spiral galaxy evolution using a volume-limited sample with $0.020<z<0.055$, $M_{\rm r}<-19.5$, and $σ>70\rm km s^{-1}$ selected from SDSS DR7. On a central SF rate-$σ$ plane, we measure the fraction of galaxies with strong bars in our sample and also the AGN fractions for barred and non-barred galaxies, respectively. The comparison between the bar and AGN fractions reveals a causal connection between the two phenomena of SF quenching and AGN activity. A massive BH and abundant gas fuels are sufficient conditions to trigger AGNs. We infer that the AGNs triggered by satisfying the two conditions drive the strong AGN feedback, suddenly suppressing the central SF and leaving the SF sequence. We find that in galaxies where either of the two conditions is not sufficient, bars are a great help for the AGN triggering, accelerating the entire process of evolution, which is particularly evident in pseudo-bulge galaxies. All of our findings are obtained only when plotted in terms of their central velocity dispersion and central SFR (not galactic scale SFR), indicating that the AGN-driven SF quenching is confined in the central kpc region.
