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A VLBA Survey of Radio Stars in the Orion Nebula Cluster. I. The Nonthermal Radio Population
The Astrophysical Journal ( IF 4.9 ) Pub Date : 2021-01-04 , DOI: 10.3847/1538-4357/abc68e
Jan Forbrich 1, 2 , Sergio A. Dzib 3 , Mark J. Reid 2 , Karl M. Menten 3
Affiliation  

We present first results of a four-epoch VLBA survey for nonthermal emission toward all 556 compact radio sources previously identified in a deep VLA survey of the Orion Nebula Cluster (ONC). We identify VLBA counterparts toward an unprecedented 123 sources. Of these, 41 do not have X-ray counterparts, of which 34 also do not display near-infrared counterparts. Since these cannot be explained by extragalactic background sources, this suggests a component of the ONC population of young stellar objects that are too deeply embedded for even X-rays to be detectable. We find pervasive variability and detect even most of the highest-S/N sources in only one out of four epochs. Neither a negative spectral index nor extreme variability in the VLA data is a good predictor of a VLBA detection.

中文翻译:

对猎户座星云星团中射电星的 VLBA 巡天。I. 非热射电群体

我们展示了对先前在猎户座星云团 (ONC) 的深度 VLA 调查中确定的所有 556 个紧凑型射电源的非热辐射的四时期 VLBA 调查的第一个结果。我们针对前所未有的 123 个来源确定了 VLBA 对应物。其中,41 个没有 X 射线对应物,其中 34 个也没有近红外对应物。由于这些无法用河外背景源来解释,这表明 ONC 年轻恒星天体的一个组成部分,它们嵌入得太深,甚至 X 射线都无法检测到。我们发现了普遍的变异性,并且仅在四分之一的时期内检测到了大多数最高 S/N 源。VLA 数据中的负光谱指数或极端可变性都不是 VLBA 检测的良好预测指标。
更新日期:2021-01-04
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