The Gould's Belt Very Large Array Survey III. The Orion region

TL;DR

This survey used the VLA to detect hundreds of radio sources in the Orion region, identifying many as young stellar objects and providing targets for further distance measurements.

Contribution

It presents high-sensitivity, large-scale radio observations of the Orion region, identifying new YSOs and characterizing their radio properties.

Findings

Detected 374 sources at 4.5 GHz and 354 at 7.5 GHz.

Identified 86 new candidate young stars based on radio properties.

Confirmed consistency of radio properties with previous Gould's Belt results.

Abstract

We present results from a high-sensitivity (60 $\mu$Jy), large-scale (2.26 square degree) survey obtained with the Karl G. Jansky Very Large Array as part of the Gould's Belt Survey program. We detected 374 and 354 sources at 4.5 and 7.5 GHz, respectively. Of these, 148 are associated with previously known Young Stellar Objects (YSOs). Another 86 sources previously unclassified at either optical or infrared wavelengths exhibit radio properties that are consistent with those of young stars. The overall properties of our sources at radio wavelengths such as their variability and radio to X-ray luminosity relation are consistent with previous results from the Gould's Belt Survey. Our detections provide target lists for followup VLBA radio observations to determine their distances as YSOs are located in regions of high nebulosity and extinction, making it difficult to measure optical parallaxes.