Detecting Radio AGN Signatures in Red Geysers-猫眼课题宝

DOI：

10.3847/1538-4357/aaee72

发表时间：

2018-11

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

N. Roy;K. Bundy;Edmond Cheung;W. Rujopakarn;M. Cappellari;F. Belfiore;R. Yan;T. Heckman;M. Bershady;J. Greene;K. Westfall;N. Drory;K. Rubin;D. Law;Kai Zhang;J. Gelfand;D. Bizyaev;D. Wake;K. Masters;D. Thomas;Cheng Li;R. Riffel

利用正在进行的SDSS-IV MaNGA调查的空间分辨光谱学，发现了一类新的静止星系，它们可能具有活动星系核驱动的风。这些星系被称为“红色间歇泉”，占当地静止人口的5%-10%，其特征是电离气体发射特征的窄双对称模式。Cheung等人认为，这些星系拥有大规模的活动星系核驱动的风，可能在抑制星星形成的后期发挥作用。在这项工作中，我们测试的假设，活动星系核活动是最终负责的红色间歇泉现象。我们将红色间歇泉的核放射性活动与具有相似恒星质量、红移、静止坐标系NUV-r色、轴比和电离气体存在的匹配对照样本进行比较。我们已经使用了1.4 GHz的无线电连续数据从VLA第一次调查叠加的无线电流量从红色间歇泉和控制样品。除了FIRST探测率高出3倍之外，我们还发现红色间歇泉的平均射电通量水平比对照星系高出5σ。在限制到静止坐标系NUV − r色>5并检查中红外WISE测光后，我们排除了星星形成污染的可能性，并得出结论，红色间歇泉与更活跃的活动星系核有关。红色间歇泉和一个可能与之相关的Hα辐射受扰的星系，占所有log（M/M）< 11的红色星系的40%。我们的研究结果支持这样一种观点，即活动星系核的周期性活动驱动着大规模的、相对较弱的电离风，这可能为许多早期星系提供了一种反馈机制。

A new class of quiescent galaxies harboring possible AGN-driven winds has been discovered using spatially resolved optical spectroscopy from the ongoing SDSS-IV MaNGA survey. These galaxies, termed “red geysers,” constitute 5%–10% of the local quiescent population and are characterized by narrow bisymmetric patterns in ionized gas emission features. Cheung et al. argued that these galaxies host large-scale AGN-driven winds that may play a role in suppressing star formation at late times. In this work, we test the hypothesis that AGN activity is ultimately responsible for the red geyser phenomenon. We compare the nuclear radio activity of the red geysers to a matched control sample with similar stellar mass, redshift, rest-frame NUV − r color, axis ratio, and presence of ionized gas. We have used the 1.4 GHz radio continuum data from the VLA FIRST survey to stack the radio flux from the red geyser and control samples. In addition to a three times higher FIRST detection rate, we find that red geysers have a 5σ higher level of average radio flux than control galaxies. After restricting to rest-frame NUV − r color >5 and checking mid-IR WISE photometry, we rule out star formation contamination and conclude that red geysers are associated with more active AGNs. Red geysers and a possibly related class with disturbed Hα emission account for 40% of all radio-detected red galaxies with log (M⋆/M⊙) < 11. Our results support a picture in which episodic AGN activity drives large-scale, relatively weak ionized winds that may provide a feedback mechanism for many early-type galaxies.

Detecting Radio AGN Signatures in Red Geysers

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