J/MNRAS/506/3169 VLA compact radio sources in the ONC (Vargas-Gonzalez+, 2021)
From downtown to the outskirts: a radio survey of the Orion Nebula Cluster.
Vargas-Gonzalez J., Forbrich J., Dzib S. A., Bally J.
<Mon. Not. R. Astron. Soc. 506, 3169-3185 (2021)>
=2021MNRAS.506.3169V 2021MNRAS.506.3169V (SIMBAD/NED BibCode)
ADC_Keywords: Interferometry ; Protostars ; YSOs ; Radio sources ; Stars, flare
Keywords: instrumentation: high angular resolution - stars: coronae -
stars: variables: T Tauri, HerbigAe/Be - stars: protostars -
radio continuum: stars
Abstract:
We present a newly enlarged census of the compact radio population
towards the Orion Nebula Cluster (ONC) using high-sensitivity
continuum maps (3-10uJy/beam) from a total of ∼30-h
centimetre-wavelength observations over an area of ∼20x20 square
arcmin obtained in the C-band (4-8GHz) with the Karl G.Jansky Very
Large Array (VLA) in its high-resolution A-configuration. We thus
complement our previous deep survey of the innermost areas of the ONC,
now covering the field of view of the Chandra Orion Ultra-deep Project
(COUP). Our catalogue contains 521 compact radio sources of which 198
are new detections. Overall, we find that 17 per cent of the (mostly
stellar) COUP sources have radio counterparts, while 53 per cent of
the radio sources have COUP counterparts. Most notably, the radio
detection fraction of X-ray sources is higher in the inner cluster and
almost constant for r>3 arcmin (0.36pc) from θ1 Ori C,
suggesting a correlation between the radio emission mechanism of these
sources and their distance from the most massive stars at the centre
of the cluster, e.g. due to increased photoionisation of circumstellar
discs. The combination with our previous observations 4yr prior lead
to the discovery of fast proper motions of up to ∼373km/s from faint
radio sources associated with ejecta of the OMC1 explosion. Finally,
we search for strong radio variability. We found changes in flux
density by a factor of up to 5 within our observations and a few
sources with changes by a factor >10 on long time-scales of a few
years.
Description:
Compact radio source catalogue towards the Orion Nebula Cluster. Data
obtained with the C-band (4-8GHz) of the Karl G. Jansky VLA of the
National Radio Astronomy Observatory. 521 compact sources are
reported with their position, peak flux densities, source structure,
known counterparts at infrared and X-ray wavelengths, distance to the
stellar system Theta 1 Ori C, and the distance to the closest phase
centre where the reported positions come from.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 118 521 Catalogue of compact radio sources in the ONC
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See also:
J/ApJ/540/236 : KH photometry of Orion Nebula Cluster (Hillenbrand+, 2000)
J/A+A/441/195 : Circumstellar disks in Trapezium cluster (Vicente+, 2005)
J/AJ/136/2136 : HST/ACS Atlas of Great Orion Nebula proplyds (Ricci+, 2008)
J/ApJ/826/16 : ALMA and GeMS observations of OMC1 region (Eisner+, 2016)
J/ApJ/822/93 : Population of compact radio sources in ONC (Forbrich+, 2016)
J/A+A/587/A153 : VISION I. VISTA Orion A Survey (Meingast+, 2016)
J/ApJ/923/221 : ALMA obs. of protoplanetary disks in ONC+OMC1 (Otter+, 2021)
J/MNRAS/522/56 : ALMA 3-mm sources in Orion-KL region (Vargas-Gonzalez+, 2023)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension (J2000)
4- 5 I2 min RAm Right Ascension (J2000)
7- 13 F7.4 s RAs Right Ascension (J2000)
15- 20 F6.4 s e_RAs Right Ascension uncertainty
22 A1 --- DE- Declination (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 34 F6.3 arcsec DEs Declination (J2000)
36- 40 F5.3 arcsec e_DEs Declination uncertainty
42- 44 I3 --- ID [1/521] Source identification number
46- 51 F6.3 mJy/beam Speak Peak flux density at C-band (4-8GHz) (1)
53- 57 F5.3 mJy/beam e_Speak Peak flux density C-band (4-8GHz)
uncertainty
59- 62 F4.2 arcsec Bmaj ?=- Source fitting structure, major axis
64- 67 F4.2 arcsec e_Bmaj ?=- Uncertainty in Bmaj
69- 72 F4.2 arcsec Bmin ?=- Source fitting structure, minor axis
74- 77 F4.2 arcsec e_Bmin ?=- Uncertainty in Bmin
79- 81 I3 deg PA ?=- Source fitting structure, Position angle
83- 85 I3 deg e_PA ?=- Uncertainty in PA
87- 90 I4 --- COUP ?=- X-ray counterpart in COUP survey (2)
92-107 A16 --- VISION Infrared counterpart in VISION (3)
109-113 F5.2 arcmin DistStar Distance to Theta 1 Ori C
115-118 F4.2 arcmin DPhCentre Distance from the closest phase centre
among six different pointings
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Note (1): Corrected by primary beam attenuation
Note (2): Chandra Orion Ultra-deep Project (COUP) by Getman et al.
(2005ApJS..160..319G 2005ApJS..160..319G, Cat. J/ApJS/160/319, A deep X-ray survey.
Note (3): Vienna Survey In Orion (VISION) by Meingast et al.
(2016A&A...587A.153M 2016A&A...587A.153M, Cat. J/A+A/587/A153, A near-infrared survey with the
European Southern Observatory's (ESO) Visible and Infrared Survey Telescope
for Astronomy (VISTA).
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Acknowledgements:
Jaime Vargas-Gonzalez, jvargas(at)carnegiescience.edu
(End) Patricia Vannier [CDS] 09-May-2024