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J/ApJ/790/49 Gould's Belt VLA survey. III. Orion region (Kounkel+, 2014)
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Beginning of ReadMe :J/ApJ/790/49 Gould's Belt VLA survey. III. Orion region (Kounkel+, 2014)
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The Gould's Belt Very Large Array survey.
III. The Orion region.
Kounkel M., Hartmann L., Loinard L., Mioduszewski A.J., Dzib S.A.,
Ortiz-Leon G.N., Rodriguez L.F., Pech G., Rivera J.L., Torres R.M.,
Boden A.F., Evans II N.J., Briceno C., Tobin J.
<Astrophys. J., 790, 49 (2014)>
=2014ApJ...790...49K
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ADC_Keywords: Radio continuum ; Cross identifications ; Infrared sources ;
X-ray sources ; YSOs
Keywords: astrometry; magnetic fields; radiation mechanisms: non-thermal;
radio continuum: stars; techniques: interferometric
Abstract:
We present results from a high-sensitivity (60muJy), large-scale
(2.26deg^2^) 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 7.5GHz, 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 follow-up Very Long Baseline Array
radio observations to determine their distances as YSOs are located in
regions of high nebulosity and extinction, making it difficult to
measure optical parallaxes.
Description:
Fields in the Orion A and B molecular clouds were observed with the
Karl G. Jansky Very Large Array (VLA) in its A configuration. The 210
individual fields have been split into 7 maps, with 30 fields being
observed per map, as follows: 12 in lambda Ori, 3 in L1622, 27 are
shared between NGC 2068 and NGC 2071, 14 are shared between NGC 2023
and NGC 2024, 11 in sigma Ori, 109 in the Orion Nebula Cluster
(ONC), 16 in L1641-N, 8 in L1641-C, and 10 in L1641-S (see Figures 1-7).
All the maps were imaged closely in time, and a total of three epochs
separated by approximately a full month were acquired in summer 2011.
Assuming a FWHM diameter of the primary beam of 10' and 6' at 4.5 and
7.5GHz respectively, the total area covered by our observations is
2.26 and 1.35deg^2^, respectively.