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首页> 外文期刊>The Astrophysical journal >THE POPULATION OF COMPACT RADIO SOURCES IN THE ORION NEBULA CLUSTER
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THE POPULATION OF COMPACT RADIO SOURCES IN THE ORION NEBULA CLUSTER

机译:猎户座星云团中紧凑型无线电源的人口数量

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摘要

We present a deep centimeter-wavelength catalog of the Orion Nebula Cluster (ONC), based on a 30 hr single-pointing observation with the Karl G. Jansky Very Large Array in its high-resolution A-configuration using two 1 GHz bands centered at 4.7 and 7.3 GHz. A total of 556 compact sources were detected in a map with a nominal rms noise of 3 μJy bm?1, limited by complex source structure and the primary beam response. Compared to previous catalogs, our detections increase the sample of known compact radio sources in the ONC by more than a factor of seven. The new data show complex emission on a wide range of spatial scales. Following a preliminary correction for the wideband primary-beam response, we determine radio spectral indices for 170 sources whose index uncertainties are less than ±0.5. We compare the radio to the X-ray and near-infrared point-source populations, noting similarities and differences.
机译:我们基于20个小时的高解析度Karl G.Jansky超大型阵列,使用两个1 GHz频带为中心的高分辨阵列,提出了猎户星云团(ONC)的深厘米波长目录。 4.7和7.3 GHz。在一个图中,总共检测到556个紧凑型光源,其标称rms噪声为3μJybm?1,受复杂的光源结构和主光束响应限制。与以前的目录相比,我们的检测将ONC中已知紧凑型无线电源的样本增加了7倍以上。新数据显示了大范围空间尺度上的复杂排放。在对宽带初级光束响应进行初步校正之后,我们确定了170个信号源的无线电频谱索引,其不确定度小于±0.5。我们将无线电与X射线和近红外点源人群进行了比较,并指出了相同点和不同点。

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