XXL调查：XXIX。GMRT 610 MHz连续谱观测
The XXL Survey: XXIX. GMRT 610 MHz continuum observations
摘要：
本文介绍了利用巨型米波射电望远镜（GMRT）在50 cm波段对北半球XXL场（XXL-N）进行的25平方度GMRT-XXL-N 610 MHz射电连续谱巡天。我们将先前发表的XMM-大尺度结构（XMM-LSS）场的观测结果（位于XXL-N的中心部分）与对剩余XXL-N区域的新观测结果相结合，并使用源剥离和大气建模（{ \sc SPAM}）管道对组合数据集进行成像。最终的马赛克包括$30.4$平方度的总面积，其中${\rm rms}<150~μ$ Jy/梁超过该面积的60%。在包围XMM-LSS场的内部9.6平方度区域中实现的${\rm rms}$约为$200~μ$ Jy/波束，而在外部12.66平方度区域（不包括噪声边缘）上实现的约为$45~μ$ Jy/波束。最终镶嵌图的分辨率为6.5弧秒。我们提出了一个在$\geq7\times {\rm rms}$上检测到的5\,434个源的目录。我们验证，并纠正的可靠性，在天体测量，流量和错误检测率的目录。利用（到目前为止）最深的无线电连续调查在一个相对较大的（2平方度）的领域，完成在探测的GMRT-XXL-N调查的通量水平，我们还评估了调查的不完整性作为通量密度的函数。由于在一个大的区域内具有丰富的多波长数据，无线电连续灵敏度达到了一定的程度，因此GMRT-XXL-N 610 MHz测量成为研究射电源，特别是放射性选定的活动星系核的物理特性、环境和宇宙演化的重要资产。
英文摘要：
We present the 25 square-degree GMRT-XXL-N 610 MHz radio continuum survey, conducted at 50~cm wavelength with the Giant Metrewave Radio Telescope (GMRT) towards the XXL Northern field (XXL-N). We combined previously published observations of the XMM-Large Scale Structure (XMM-LSS) field, located in the central part of XXL-N, with newly conducted observations towards the remaining XXL-N area, and imaged the combined data-set using the Source Peeling and Atmospheric Modeling ({\sc SPAM}) pipeline. The final mosaic encompasses a total area of $30.4$ square degrees, with ${\rm rms}<150~μ$Jy/beam over 60\% of the area. The ${\rm rms}$ achieved in the inner 9.6 square degree area, enclosing the XMM-LSS field, is about $200~μ$Jy/beam, while that over the outer 12.66 square degree area (which excludes the noisy edges) is about $45~μ$Jy/beam. The resolution of the final mosaic is 6.5 arcsec. We present a catalogue of 5\,434 sources detected at $\geq7\times {\rm rms}$. We verify, and correct the reliability of, the catalog in terms of astrometry, flux, and false detection rate. Making use of the (to date) deepest radio continuum survey over a relatively large (2 square degree) field, complete at the flux levels probed by the GMRT-XXL-N survey, we also assess the survey's incompleteness as a function of flux density. The radio continuum sensitivity reached over a large field with a wealth of multi-wavelength data available makes the GMRT-XXL-N 610 MHz survey an important asset for studying the physical properties, environments and cosmic evolution of radio sources, in particular radio-selected active galactic nuclei (AGN).
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
