Cold-gas outflows in typical low-redshift galaxies are driven by star formation, not AGN

Cold-gas outflows in typical low-redshift galaxies are driven by star formation, not AGN
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典型的低红移星系中的冷气体流出是由恒星形成驱动的,而不是活动星系核

DOI:
10.1093/mnrasl/slv165
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发表时间:
2015
期刊:
Letters
影响因子:
--
通讯作者:
Sarzi M
Sarzi M
中科院分区:
--
文献类型:
--
作者:
Sarzi M

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在星系形成模型中,来自活动星系核(AGN)的能量反馈是调节星系恒星形成历史的重要组成部分,因此研究活动星系核反馈在实际中是如何发生的具有重要意义。为了捕捉agn在淬火恒星形成过程中的作用,我们使用了星际naλ λ5890, 5895(NaD)吸收谱线来寻找456个附近星系样本中的冷气体流出,我们可以明确地确定无线电agn活动的存在,这要归功于毫角秒尺度的无线电成像。虽然在103个星系(占样本的23%)中发现了表明射电AGN的紧凑射电发射,并且23个物体(5%)表现出暗示冷空气流出的NaD吸收线运动,但没有一个物体同时显示出射电AGN和冷空气流出的证据。无线电-AGN活动主要出现在早期型星系中,而冷空气外流主要出现在具有中心恒星形成或复合恒星形成/AGN活动的螺旋星系中。在我们的样本中,光学agn似乎也不能驱动星系风。我们的工作增加了低红移宇宙的图景,在那里,大质量星系中的冷气体流出通常是由恒星形成驱动的,而无线电agn活动最常发生在气藏已经明显枯竭的系统中。
Energetic feedback from active galactic nuclei (AGN) is an important ingredient for regulating the star formation history of galaxies in models of galaxy formation, which makes it important to study how AGN feedback actually occurs in practice. In order to catch AGNs in the act of quenching star formation, we have used the interstellar Naiλλ5890, 5895(NaD) absorption lines to look for cold-gas outflows in a sample of 456 nearby galaxies for which we could unambiguously ascertain the presence of radio-AGN activity, thanks to radio imaging at milli-arcsecond scales. While compact radio emission indicating a radio AGN was found in 103 galaxies (23 per cent of the sample), and 23 objects (5 per cent) exhibited NaD absorption-line kinematics suggestive of cold-gas outflows, not one object showed evidence of a radio AGN and of a cold-gas outflow simultaneously. Radio-AGN activity was found predominantly in early-type galaxies, while cold-gas outflows were mainly seen in spiral galaxies with central star formation or composite star formation/AGN activity. Optical AGNs also do not seem capable of driving galactic winds in our sample. Our work adds to a picture of the low-redshift Universe, where cold-gas outflows in massive galaxies are generally driven by star formation and where radio-AGN activity occurs most often in systems in which the gas reservoir has already been significantly depleted.
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