Signatures of Inflowing Gas in Red Geyser Galaxies Hosting Radio Active Galactic Nuclei
Signatures of Inflowing Gas in Red Geyser Galaxies Hosting Radio Active Galactic Nuclei
复制标题
DOI：
10.3847/1538-4357/ac0f74
复制
发表时间：
2021-06
期刊：
影响因子：
--
通讯作者：
N. Roy;K. Bundy;K. Rubin;K. Rowlands;K. Westfall;R. Riffel;D. Bizyaev;D. Stark;R. Riffel;I. Lacerna;P. Nair;Xuanyi Wu;N. Drory
中科院分区：
文献类型：
--
作者：
N. Roy;K. Bundy;K. Rubin;K. Rowlands;K. Westfall;R. Riffel;D. Bizyaev;D. Stark;R. Riffel;I. Lacerna;P. Nair;Xuanyi Wu;N. Drory
我们研究了 140 个局部 (z < 0.1) 早期型红色间歇泉星系中 NaD 吸收所追踪的冷中性气体。这些星系在空间分辨的强线发射图中显示出独特的特征，这些特征被解释为大规模活跃的星系核驱动的电离风。为了研究这些风的可能燃料来源，我们检查了根据红色间歇泉中 Na i D 吸收推断出的冷气体 (T ∼ 100–1000 K) 的丰度和运动学，以及从阿帕奇点天文台调查的斯隆数字巡天 IV 绘制附近星系地图中提取的匹配控制样本。我们发现红色间歇泉含有大量与 NaD 相关的物质。超过 50% 的红色间歇泉（对照样本为 25%）中检测到大量冷气体成分，而无线电检测到的红色间歇泉的这一比例高达 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。在我们探测到的 30 个红色间歇泉中，86% 的 NaD 吸收速度（相对于系统速度）在 40 至 50 km s−1 之间。我们通过在每个样本上叠加 NaD 剖面来验证这一结果，这证实了红色间歇泉 (∼40 km s−1) 内存在下降的 NaD 速度，而在控制样本中没有检测到速度偏移。将我们的观测结果解释为流入的冷中性云的特征，我们得出了近似的质量流入速率 Ṁin∼0.1M⊙yr−1 ，类似于小型合并和内部循环的预期。一些红色间歇泉显示出更高的速率（Ṁin∼5M⊙yr−1），这可能表明正在进行的吸积事件。
We study cool neutral gas traced by NaD absorption in 140 local (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 nucleus–driven ionized winds. To investigate the possible fuel source for these winds, we examine the abundance and kinematics of cool gas (T ∼ 100–1000 K) inferred from Na i D absorption in red geysers and matched control samples drawn from the Sloan Digital Sky Survey IV Mapping Nearby Galaxies at Apache Point Observatory survey. We find that red geysers host greater amounts of NaD-associated material. Substantial cool gas components are detected in more than 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 40 and 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 (∼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 Ṁin∼0.1M⊙yr−1 , similar to that expected from minor merging and internal recycling. Some red geysers show much higher rates ( Ṁin∼5M⊙yr−1 ), which may indicate an ongoing accretion event.