Fuelling the nuclear ring of NGC 1097
Fuelling the nuclear ring of NGC 1097
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为 NGC 1097 的核环提供燃料
DOI：
10.1093/mnras/stad1554
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发表时间：
2023
影响因子：
4.8
通讯作者：
Meidt, Sharon E.
中科院分区：
文献类型：
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作者：
Sormani, Mattia C.;Barnes, Ashley T.;Sun, Jiayi;Stuber, Sophia K.;Schinnerer, Eva;Emsellem, Eric;Leroy, Adam K.;Glover, Simon C. O.;Henshaw, Jonathan D.;Meidt, Sharon E.
星系棒可以驱使冷气体流入星系中心。气体传输主要通过所谓的棒尘带发生，棒尘带连接着千秒差距尺度的星系盘和数百秒差距尺度的核环，就像两条巨大的星系河流。一旦进入环中，气体可以为星星形成活动、星系外流和中心超大质量黑洞提供燃料。因此，测量质量流入率对于理解星系核的质量/能量收支和演化非常重要。在这项工作中，我们使用CO数据从PHANGS ALMA调查和一个简单的几何方法来测量棒驱动的质量流入率的棒星系NGC 1097的核环。该方法假设，在酒吧车道的气体速度是平行的车道在框架中与酒吧共同旋转，并允许一个足够敏感和解决的位置-位置-速度图，如果酒吧模式的速度和星系的取向是已知的，以获得流入率。我们发现，在4000万年的时间跨度内，流入率的平均值变化了几个因素，超过1000万年的时间尺度。大部分的流入似乎被消耗的星星形成的环，这是目前发生在一个星星形成率（SFR），这表明流入是因果控制的SFR环作为一个函数的时间。
Galactic bars can drive cold gas inflows towards the centres of galaxies. The gas transport happens primarily through the so-called bar dust lanes, which connect the galactic disc at kpc scales to the nuclear rings at hundreds of pc scales much like two gigantic galactic rivers. Once in the ring, the gas can fuel star formation activity, galactic outflows, and central supermassive black holes. Measuring the mass inflow rates is therefore important to understanding the mass/energy budget and evolution of galactic nuclei. In this work, we use CO datacubes from the PHANGS-ALMA survey and a simple geometrical method to measure the bar-driven mass inflow rate on to the nuclear ring of the barred galaxy NGC 1097. The method assumes that the gas velocity in the bar lanes is parallel to the lanes in the frame co-rotating with the bar, and allows one to derive the inflow rates from sufficiently sensitive and resolved position–position–velocity diagrams if the bar pattern speed and galaxy orientations are known. We find an inflow rate ofaveraged over a time span of 40 Myr, which varies by a factor of a few over time-scales of ∼10 Myr. Most of the inflow appears to be consumed by star formation in the ring, which is currently occurring at a star formation rate (SFR) of, suggesting that the inflow is causally controlling the SFR in the ring as a function of time.