Poster Open Access

The Orion Radio All-Stars: Radio census and proper motions with the VLA and nonthermal variability with ALMA and the VLBA

Vargas-González, Jaime; Forbrich, Jan; Dzib, Sergio; Bally, John

Wolk, Scott

We are presenting a follow-up of our deep VLA radio survey in the central part of the Orion Nebula Cluster (ONC) at cm-wavelengths, now expanded to the outskirts of the cluster. We find strong evidence of the effect that the high-mass stars in the Trapezium have on the radio properties of nearby sources which most likely show free-free radio emission from external photoevaporation. We also compare our two sensitive VLA epochs of the central cluster, with a time baseline of just a few years, to measure fast proper motions of faint features related to the OMC1 explosion. In our continued variability study there are no new cases of extreme events (variability greater than an order of magnitude on short timescales), however it is within the expectations for these new and shorter observations. In addition to this analysis we expand our study of nonthermal YSO radio variability using ALMA and the VLBA, conducting a systematic monitoring in the millimeter range to constrain the occurrence of synchrotron flares which could have implications in disk mass measurements of insufficiently spatially resolved protoplanetary discs. The VLBA allows us to filter out any thermal emission making possible the study of the exclusively nonthermal population in the ONC at centimeter-wavelengths for which we present its variability in a greater detail.

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