论文标题
与GMRT的南极望远镜SZ选择群集的低频无线电光环调查
A low-frequency radio halo survey of the South Pole Telescope SZ-selected clusters with the GMRT
论文作者
论文摘要
通过检测Mega-Parsec（MPC）尺度弥散无线电同步子发射，已知非热电子和大规模磁场在集群内培养基（ICM）中的存在。尽管在过去十年中，发现新的扩散无线电来源的进展很大，但大多数调查都被限制在大规模的低红移簇上。在这项工作中，我们使用红移$ z> 0.3 $探索群集，以搜索漫射无线电排放，以325 MHz的速度使用巨型Metrewave射电望远镜（GMRT）。该活动导致发现了2个新的无线电光环（SPT-CL J0013-4906和SPT-CL J0304-4401）以及其他2个检测结果（SPT-CL J2031-4037和SPT-CL J2248-4431），先前报道了（325 MHz）。此外，我们在样品中检测到1个簇中的晕圈候选者，并将光晕的上限放置在未检测到弥散发射的8个集群中。在$ p_ {1.4} - l_ \ mathrm {x} $平面中，检测到的光环遵循观察到的相关性，而上限则位于相关线上上方，表明将来检测到敏感观察结果的可能性。
The presence of non-thermal electrons and large scale magnetic fields in the intra-cluster medium (ICM) is known through the detection of mega-parsec (Mpc) scale diffuse radio synchrotron emission. Although a significant amount of progress in finding new diffuse radio sources has happened in the last decade, most of the investigation has been constrained towards massive low-redshift clusters. In this work, we explore clusters with redshift $z>0.3$ in search of diffuse radio emission, at 325 MHz with the Giant Metrewave Radio Telescope (GMRT). This campaign has resulted in the discovery of 2 new radio halos (SPT-CL J0013-4906 and SPT-CL J0304-4401) along with 2 other detections (SPT-CL J2031-4037 and SPT-CL J2248-4431), previously reported (at 325 MHz) in the literature. In addition, we detect a halo candidate in 1 cluster in our sample, and upper limits for halos are placed in 8 clusters where no diffuse emission is detected. In the $P_{1.4} - L_\mathrm{X}$ plane, the detected halos follow the observed correlation, whereas the upper limits lie above the correlation line, indicating the possibility of future detection with sensitive observations.
