论文标题
MAVERIC调查：无线电目录和源数来自25个银河球状簇的深度阵列成像
The MAVERIC Survey: Radio catalogs and source counts from deep Very Large Array imaging of 25 Galactic globular clusters
论文作者
论文摘要
Maveric调查是对银河系球状簇的首次深度无线电连续成像调查，其中心目标是查找和分类积聚紧凑的二进制文件，包括恒星质量的黑洞。在这里，我们提出了25个群集的无线电源目录，具有非常深的Karl G. Jansky非常大的阵列观测值。观察时间的中位数为每个簇10小时，在中心频率分别为5.0和7.2 GHz的典型RMS敏感性分别为2.3和2.1 UJY。我们在5个Sigma的调查中检测到近1300个来源，尽管其中许多可能是背景来源，但我们也发现了一些在某些群集中过多的无线电来源的证据。集群核心源的无线电光谱指数分布与背景不同，并显示了双峰分布。我们暂时将陡峭的光谱源（5.0 GHz时更明亮）分类为毫秒脉冲星和平面光谱源，称为紧凑或其他类型的二进制文件。这些临时分类将通过X射线和光学数据的未来添加来巩固。我们图像的外部区域代表了一个深，相对较宽的场（〜0.4/sq。DEG）和高分辨率C频段背景调查，我们介绍了针对该区域计算的源数。我们还向社区发布了这25个集群的无线电连续图像。
The MAVERIC survey is the first deep radio continuum imaging survey of Milky Way globular clusters, with a central goal of finding and classifying accreting compact binaries, including stellar-mass black holes. Here we present radio source catalogs for 25 clusters with ultra-deep Karl G. Jansky Very Large Array observations. The median observing time was 10 hr per cluster, resulting in typical rms sensitivities of 2.3 and 2.1 uJy per beam at central frequencies of 5.0 and 7.2 GHz, respectively. We detect nearly 1300 sources in our survey at 5 sigma, and while many of these are likely to be background sources, we also find strong evidence for an excess of radio sources in some clusters. The radio spectral index distribution of sources in the cluster cores differs from the background, and shows a bimodal distribution. We tentatively classify the steep-spectrum sources (those much brighter at 5.0 GHz) as millisecond pulsars and the flat-spectrum sources as compact or other kinds of binaries. These provisional classifications will be solidified with the future addition of X-ray and optical data. The outer regions of our images represent a deep, relatively wide field (~ 0.4/sq. deg) and high resolution C band background survey, and we present source counts calculated for this area. We also release radio continuum images for these 25 clusters to the community.
