在拥有射电活动星系核的红色间歇泉星系中流入气体的特征
Signatures of inflowing gas in red geyser galaxies hosting radio-AGN
摘要：
本文研究了140个本星系（$\rm z<0.1)$）早期型“红间歇泉”星系中冷中性气体的NaD吸收示踪。这些星系在空间分辨的强线辐射图中显示出独特的特征，这些特征被解释为大尺度活动星系核驱动的电离风。为了研究这些风可能的燃料来源，我们研究了冷气体（$\rm T \sim 100-1000 K$）的丰度和运动学推断，从钠I D吸收在红色间歇泉和匹配的控制样品从SDSS-IV MANGA。我们发现，红色间歇泉主机更多的NaD相关的材料。在超过$\rm 50 \%$的红色间歇泉中检测到大量冷气体成分（与对照样品的25%相比），对于放射性检测的红色间歇泉，高达78 $\%$。我们的主要结果是，红色间歇泉中的冷气体主要是下落的。在我们的30个放射性检测的红色间歇泉，86 $\%$显示后退NaD吸收速度（相对于系统速度）之间的$\rm 40 - 50~km~s^{-1}$。我们通过在每个样品上叠加NaD剖面来验证这一结果，这证实了红色间歇泉（$\sim\rm 40~km~s^{-1}$）内存在下降的NaD速度，而在对照样品中没有检测到速度偏移。解释我们的观察流入冷中性云的签名，我们得到一个近似的质量流入率$\rm \dot{M}_{in} \sim 0.1 M_{\odot} yr^{-1}$，类似于预期的小合并和内部再循环。一些红色间歇泉显示出更高的速率（$\rm \dot{M}_{in} \sim 5 M_{\odot} yr^{-1}$），这可能表明正在进行的增生事件。
英文摘要：
We study cool neutral gas traced by NaD absorption in 140 local ($\rm z<0.1)$ early-type ``red geyser'' galaxies. These galaxies show unique signatures in spatially-resolved strong-line emission maps that have been interpreted as large-scale active galactic nuclei driven ionized winds. To investigate the possible fuel source for these winds, we examine the abundance and kinematics of cool gas ($\rm T \sim 100-1000 K$) inferred from Na I D absorption in red geysers and matched control samples drawn from SDSS-IV MaNGA. We find that red geysers host greater amounts of NaD-associated material. Substantial cool gas components are detected in more than $\rm 50 \%$ of red geysers (compared to 25\% of the control sample) going up to 78$\%$ for radio-detected red geysers. Our key result is that cool gas in red geysers is predominantly infalling. Among our 30 radio-detected red geysers, 86$\%$ show receding NaD absorption velocities (with respect to the systemic velocity) between $\rm 40 - 50~km~s^{-1}$. We verify this result by stacking NaD profiles across each sample which confirms the presence of infalling NaD velocities within red geysers ( $\sim\rm 40~km~s^{-1}$) with no velocity offsets detected in the control samples. Interpreting our observations as signatures of inflowing cool neutral clouds, we derive an approximate mass inflow rate of $\rm \dot{M}_{in} \sim 0.1 M_{\odot} yr^{-1}$, similar to that expected from minor merging and internal recycling. Some red geysers show much higher rates ($\rm \dot{M}_{in} \sim 5 M_{\odot} yr^{-1}$) that may indicate an ongoing accretion event.
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