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        A VLBA Survey of radio stars in the Orion Nebula Cluster: I. The nonthermal radio population

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        2011.09329v1.pdf (PDF, 189Kb)
        Author
        Forbrich, Jan
        Dzib, Sergio A.
        Reid, Mark J.
        Menten, Karl M.
        Attention
        2299/23796
        Abstract
        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.
        Publication date
        2021-01-04
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.3847/1538-4357/abc68e
        Other links
        http://hdl.handle.net/2299/23796
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