A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). IV. Rapidly Growing (Super)Massive Black Holes in Extremely Radio-loud Galaxies-猫眼课题宝

DOI：

10.3847/1538-4357/ac1b26

发表时间：

2021-08

期刊：

The Astrophysical Journal

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通讯作者：

中科院分区：

其他

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作者：

K. Ichikawa;T. Yamashita;Y. Toba;T. Nagao;K. Inayoshi;M. Charisi;W. He;A. Wagner;M. Akiyama;Bovornpratch Vijarnwannaluk;Xiaoyang Chen;M. Kajisawa;T. Kawamuro;Chien-Hsiu Lee;Y. Matsuoka;M. Schramm;H. Suh;Masayuki Tanaka;H. Uchiyama;Y. Ueda;Janek Pflugradt;Hikaru Fukuchi

通过交叉匹配Subaru/Hyper prime- cam （HSC）深光学成像巡天和VLA/FIRST 1.4 GHz射电巡天，我们展示了39个极射电大星系的光学和红外特性。最近的Subaru/HSC战略调查揭示了光学微弱的射电星系（RG）低至g AB ~ 26，打开了一个新的射电大星系（ERGs）的参数空间，射电大参数为logrest=log(f1.4GHz,rest/fg,rest)>4。由于它们的光学亮度较弱，且数量密度很小（~ 1°−2），因此在以往的宽而浅或深而小面积光学调查中很难发现此类ergg。erg表现出与传统rg不同的有趣特性：(1)大多数erg位于恒星形成主序之上或之上，其中一些可能是log(M - - /M⊙)<10的低质量星系。(2) ERGs具有较高的比黑洞吸积速率，达到Eddington极限数量级。固有的射电响度（int），由喷流功率与辐射光度之比定义，比射电类星体高一个数量级。这表明ERGs拥有一种独特的活动星系核（AGN），它显示出强大的辐射和喷流。因此，erg是非常快速增长的黑洞在强烈的AGN反馈开始之前达到Eddington-limited吸积的突出候选者。

We present the optical and infrared properties of 39 extremely radio-loud galaxies discovered by cross-matching the Subaru/Hyper Suprime-Cam (HSC) deep optical imaging survey and VLA/FIRST 1.4 GHz radio survey. The recent Subaru/HSC strategic survey revealed optically faint radio galaxies (RG) down to g AB ∼ 26, opening a new parameter space of extremely radio-loud galaxies (ERGs) with radio-loudness parameter of logrest=log(f1.4GHz,rest/fg,rest)>4 . Because of their optical faintness and small number density of ∼1 deg−2, such ERGs were difficult to find in the previous wide but shallow or deep but small area optical surveys. ERGs show intriguing properties that are different from the conventional RGs: (1) most ERGs reside above or on the star-forming main-sequence and some of them might be low-mass galaxies with log(M⋆/M⊙)<10 . (2) ERGs exhibit a high specific black hole accretion rate, reaching the order of the Eddington limit. The intrinsic radio loudness ( int ), defined by the ratio of jet power over bolometric radiation luminosity, is one order of magnitude higher than that of radio quasars. This suggests that ERGs harbor a unique type of active galactic nuclei (AGN) that show both powerful radiations and jets. Therefore, ERGs are prominent candidates of very rapidly growing black holes reaching Eddington-limited accretion just before the onset of intensive AGN feedback.

A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). IV. Rapidly Growing (Super)Massive Black Holes in Extremely Radio-loud Galaxies

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