论文标题
J1615+5452：Elais-N1字段中的残余射电星系
J1615+5452: a remnant radio galaxy in the ELAIS-N1 field
论文作者
论文摘要
我们报告了Elais-N1领域中残留的Radio AGN J1615+5452的发现。 GMRT连续观测在150、325和610 MHz和1.4 GHz NVSS调查中的档案数据结合使用来得出源的无线电谱。在红移$ z \ sim $ 0.33时，J1615+5452的线性大小为$ \ sim $ 100 kpc和频谱索引范围在$α^{1400} _ {610} <-1.5 $和$α^{325} _ {325} _ {1500} _ {150} _ {150} _ {150} _ {150} = -0.61 = -0.61 = -0.61 = -0.11 = -0.12虽然源在低频下具有弥散的无线电发射，但我们在1.4 \，GHz VLA数据$ \ sim 5 $ arcsec Arcsec角度分辨率中没有找到核心，喷气机或热点的证据。这种形态学特性与弯曲的无线电光谱相结合，表明AGN加油机制经历了垂死无线电AGN的典型能量供应。这与频谱$Δα\约-1 $中观察到的陡峭曲率，估计的同步体年龄为$ t _ {\ rm s} = 76.0^{+7.4} _ {-8.7} $
We report the discovery of a remnant radio AGN J1615+5452 in the field of ELAIS-N1. GMRT continuum observations at 150, 325 and 610 MHz combined with archival data from the 1.4 GHz NVSS survey were used to derive the radio spectrum of the source. At a redshift $z \sim$ 0.33, J1615+5452 has a linear size of $\sim$ 100 kpc and spectral indices ranging between $α^{1400}_{610} < -1.5$ and $α^{325}_{150} = -0.61 \pm 0.12$. While the source has a diffuse radio emission at low frequencies, we do not find evidence of core, jets or hotspots in the 1.4\,GHz VLA data of $\sim 5$ arcsec angular resolution. Such morphological properties coupled with a curved radio spectrum suggest that the AGN fueling mechanisms undergo a shortage of energy supply which is typical of a dying radio AGN. This is consistent with the observed steep curvature in the spectrum $Δα\approx -1$, the estimated synchrotron age of $t_{\rm s}=76.0^{+7.4}_{-8.7}$ Myr and a $t_{\rm off}/t_{\rm s}$ ratio of $\sim 0.3$.
