Radio Galaxy Zoo: discovery of a poor cluster through a giant wide-angle tail radio galaxy
Radio Galaxy Zoo: discovery of a poor cluster through a giant wide-angle tail radio galaxy
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DOI：
10.1093/mnras/stw1067
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发表时间：
2016-06
影响因子：
4.8
通讯作者：
Jk K. Banfield;H. Andernach;A. D. Kapinska;L. Rudnick;M. Hardcastle;G. Cotter;S. Vaughan;Tw W. Jones;I. Heywood;J. Wing;O. I. Wong;T. Matorny;I. A. Terentev;Á. López-Sánchez;R. Norris;N. Seymour;S. S. Shabala-S.;Kw W. Willett
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文献类型：
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作者：
Jk K. Banfield;H. Andernach;A. D. Kapinska;L. Rudnick;M. Hardcastle;G. Cotter;S. Vaughan;Tw W. Jones;I. Heywood;J. Wing;O. I. Wong;T. Matorny;I. A. Terentev;Á. López-Sánchez;R. Norris;N. Seymour;S. S. Shabala-S.;Kw W. Willett
我们通过射电星系动物园项目中发现的一个不同寻常的广角巨尾射电星系，发现了一个以前从未报道过的贫乏星系团(RGZ-CL J0823.2+0333)。得到E0型主星系2MASX J08231289+0333016的光谱红移z=0.0897，得到Mr=−22.6，射电光度密度L 1.4=5.5×1024W Hz−1。这些射电和光学光度是位于Fanaroff-Riley类I和II之间边界附近的广角拖尾射电星系的典型特征。≈8 Armin的投影最大角尺寸相当于800kpc，沿弯曲喷流/尾迹的源全长为1.1mpc。来自XMM-牛顿档案馆的X射线数据给出了假设星系团内介质温度为1.0-5.0keV时，RGZ J082312.9+033301周围热发射的X射线光度上限为1.2-2.6×1043erg S−1。我们对RGZ J082312.9+033301周围环境的分析表明，RGZ J082312.9+033301属于贫星团。观测到的射电形态表明：(A)相对于至少一个贫星系团的周围介质，宿主星系正在以显著的速度运动，(B)源可能经历了两次活动星系核的点火事件，其间间隔了107年。这强化了RGZJ082312.9+033301和新发现的贫星团之间存在关联的想法。
We have discovered a previously unreported poor cluster of galaxies (RGZ-CL J0823.2+0333) through an unusual giant wide-angle tail radio galaxy found in the Radio Galaxy Zoo project. We obtained a spectroscopic redshift of z = 0.0897 for the E0-type host galaxy, 2MASX J08231289+0333016, leading to M r = −22.6 and a 1.4 GHz radio luminosity density of L 1.4 = 5.5 × 10 24 W Hz −1 . These radio and optical luminosities are typical for wide-angle tailed radio galaxies near the borderline between Fanaroff–Riley classes I and II. The projected largest angular size of ≈8 arcmin corresponds to 800 kpc and the full length of the source along the curved jets/trails is 1.1 Mpc in projection. X-ray data from the XMM-Newton archive yield an upper limit on the X-ray luminosity of the thermal emission surrounding RGZ J082312.9+033301 at 1.2–2.6 × 10 43 erg s −1 for assumed intracluster medium temperatures of 1.0–5.0 keV. Our analysis of the environment surrounding RGZ J082312.9+033301 indicates that RGZ J082312.9+033301 lies within a poor cluster. The observed radio morphology suggests that (a) the host galaxy is moving at a significant velocity with respect to an ambient medium like that of at least a poor cluster, and that (b) the source may have had two ignition events of the active galactic nucleus with 10 7 yr in between. This reinforces the idea that an association between RGZ J082312.9+033301 and the newly discovered poor cluster exists.