A Tale of Two Feedbacks: Star Formation in the Host Galaxies of Radio AGNs
A Tale of Two Feedbacks: Star Formation in the Host Galaxies of Radio AGNs
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两个反馈的故事：射电活动星系核主星系中的恒星形成
DOI：
10.1088/0004-637x/784/2/137
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Y.
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文献类型：
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作者：
Karouzos;M.;Im;M.;Trichas;M.;Goto;T.;Malkan;M.;Ruiz;A. Jeon;Y.;Kim;J.H.;Lee;H.M.;Kim;S.J.;Oi;N.;Matsuhara;H.;Takagi;T.;Murata;K.;Wada;T.;Wada;K.;Shim;H.;Hanami;H.;Serjeant;S.;White;G.J.;Pearson;C.;Ohyama;Y.
有几种观点支持星系核心的活动（以吸积的超大质量黑洞的形式）与星系中恒星形成活动之间存在联系。长期以来，射电喷流一直被认为是一种理想的机制，它允许活动星系核（agn）与宿主星系相互作用并影响恒星形成。我们利用北黄道极（NEP）场的射电源样本，通过光谱能量分布（SED）拟合来研究这种假定联系的性质。我们利用AKARI红外空间望远镜出色的光谱覆盖范围和NEP中丰富的辅助数据来构建从紫外到远红外波长的SEDs。我们在相对微弱的射电源（< mJy）样本中发现了显著的AGN成分。发现AGN成分的光度与宿主星系中恒星形成的光度呈正相关，与射电光度无关。相反，对于窄红移和AGN光度范围，我们发现增加射电光度会导致特定恒星形成率的降低。由于各自的红移，人们发现最响亮的agn位于恒星形成的主序列上。这是我们第一次在同一个样本中看到这样一个双面反馈过程。我们讨论了在具有强射电喷流的系统中可能抑制恒星形成，而不是完全猝灭，这支持了射电AGN喷流反馈的维持性质。
Several lines of argument support the existence of a link between activity at the nuclei of galaxies, in the form of an accreting supermassive black hole, and star formation activity in these galaxies. Radio jets have long been argued to be an ideal mechanism that allows active galactic nuclei (AGNs) to interact with their host galaxies and affect star formation. We use a sample of radio sources in the North Ecliptic Pole (NEP) field to study the nature of this putative link, by means of spectral energy distribution (SED) fitting. We employ the excellent spectral coverage of the AKARI infrared space telescope and the rich ancillary data available in the NEP to build SEDs extending from UV to far-IR wavelengths. We find a significant AGN component in our sample of relatively faint radio sources (< mJy). A positive correlation is found between the luminosity of the AGN component and that of star formation in the host galaxy, independent of the radio luminosity. In contrast, for narrow redshift and AGN luminosity ranges, we find that increasing radio luminosity leads to a decrease in the specific star formation rate. The most radio-loud AGNs are found to lie on the main sequence of star formation for their respective redshifts. For the first time, we potentially see such a two-sided feedback process in the same sample. We discuss the possible suppression of star formation, but not total quenching, in systems with strong radio jets, that supports the maintenance nature of feedback from radio AGN jets.