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J/ApJ/818/116      Gould's Belt VLA survey. V. Perseus region      (Pech+, 2016)

The Gould's Belt very large array survey. V. The Perseus region. Pech G., Loinard L., Dzib S.A., Mioduszewski A.J., Rodriguez L.F., Ortiz-Leon G.N., Rivera J.L., Torres R.M., Boden A.F., Hartman L., Kounkel M.A., Evans Ii N.J., Briceno C., Tobin J., Zapata L.A. <Astrophys. J., 818, 116 (2016)> =2016ApJ...818..116P (SIMBAD/NED BibCode)
ADC_Keywords: Radio sources ; Molecular clouds ; YSOs ; Interferometry Keywords: radiation mechanisms: nonthermal - radiation mechanisms: thermal - radio continuum: stars - techniques: interferometric Abstract: We present multiepoch, large-scale (∼2000 arcmin2), fairly deep (∼16 µJy), high-resolution (∼1") radio observations of the Perseus star-forming complex obtained with the Karl G. Jansky Very Large Array at frequencies of 4.5 and 7.5 GHz. These observations were mainly focused on the clouds NGC 1333 and IC 348, although we also observed several fields in other parts of the Perseus complex. We detect a total of 206 sources, 42 of which are associated with young stellar objects (YSOs). The radio properties of about 60% of the YSOs are compatible with a nonthermal radio emission origin. Based on our sample, we find a fairly clear relation between the prevalence of nonthermal radio emission and evolutionary status of the YSOs. By comparing our results with previously reported X-ray observations, we show that YSOs in Perseus follow a Gudel-Benz relation with κ=0.03, consistent with other regions of star formation. We argue that most of the sources detected in our observations but not associated with known YSOs are extragalactic, but provide a list of 20 unidentified radio sources whose radio properties are consistent with being YSO candidates. Finally, we also detect five sources with extended emission features that can clearly be associated with radio galaxies. Description: The observations were collected with the VLA of the National Radio Astronomy Observatory in B and BnA configurations. Two frequency subbands, each 1 GHz wide and centered at 4.5 and 7.5 GHz, respectively, were recorded simultaneously. The observations were obtained in three sessions, on 2011 March 06/13, April 14/25, and May 01/02/10/19/22, typically separated from one another by a month. This dual-frequency, multiepoch strategy was chosen to enable the characterization of the spectral index and variability of the detected sources, as well as to help with the identification of the emission mechanisms. Objects: ----------------------------------------------------------- RA (ICRS) DE Designation(s) ----------------------------------------------------------- 03 28 55 +31 22.2 Ced 16 = NGC 1333 03 44 34 +32 09.8 NAME omi Per Cloud = IC 348 ----------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 50 12 VLA Observations table3.dat 71 91 Radio Sources Detected in IC 348 table4.dat 71 41 Radio Sources Detected in Single Fields in Perseus
See also: VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) J/ApJ/497/736 : The young cluster IC 348. (Herbig, 1998) J/ApJ/593/1093 : IC 348 membership (Luhman+, 2003) J/A+A/468/1009 : Star formation in Perseus. II. (Hatchell+, 2007) J/AJ/134/411 : Properties of IC 348 members (Muench+, 2007) J/ApJ/775/63 : Gould's Belt VLA Survey. I. Ophiuchus complex (Dzib+, 2013) J/ApJ/790/49 : Gould's Belt VLA survey. III. Orion region (Kounkel+, 2014) J/ApJ/801/91 : Gould's Belt Very Large Array survey. IV. Taurus (Dzib+, 2015) J/ApJ/805/9 : Gould's Belt VLA Survey. II. Serpens region (Ortiz-Leon+, 2015) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Region Region identifier 9 A1 --- n_Region [d] Note on Region (1) 11 A1 --- Epoch [123C] Epoch (2) 13- 16 F4.2 arcsec Bmaj4.5 Synthesised beam major axis at 4.5GHz 18- 21 F4.2 arcsec Bmin4.5 Synthesised beam minor axis at 4.5GHz 23- 27 F5.1 deg PA4.5 [] Position angle of synthesized beam at 4.5GHz 29- 32 F4.2 arcsec Bmaj7.5 Synthesised beam major axis at 7.5GHz 34- 37 F4.2 arcsec Bmin7.5 Synthesised beam minor axis at 7.5GHz 39- 44 F6.2 deg PA7.5 [] Position angle of synthesized beam at 7.5GHz 46- 47 I2 muJy/beam rms4.5 rms noise measured at the center of the Stokes I image, at 4.5GHz 49- 50 I2 muJy/beam rms7.5 rms noise measured at the center of the Stokes I image, at 7.5GHz
Note (1): Note as follows: d = Average values in the seven individual fields. Note (2): C indicates parameters measured in the images after combining the epochs.
Byte-by-byte Description of file: table3.dat table4.dat
Bytes Format Units Label Explanations
1- 19 A19 --- Name GBS-VLA Name ( 21 A1 --- New [YN] New source? (1) 23- 27 F5.2 mJy F4.5 Flux density at 4.5GHz 29- 33 F5.3 mJy e_F4.5 Uncertainty in F4.5 35 A1 --- l_Var4.5 [>] Limit flag on Var4.5 36- 37 I2 % Var4.5 [4/96]? Variability of the source at 4.5GHz 39- 40 I2 % e_Var4.5 [1/68]? Uncertainty in Var4.5 41 A1 --- n_Var4.5 [E] Note on Var4.5 (2) 43 A1 --- l_F7.5 [<] Limit flag on F7.5 44- 48 F5.2 mJy F7.5 ? Flux density at 7.5GHz 50- 53 F4.2 mJy e_F7.5 ? Uncertainty in F7.5 55 A1 --- l_Var7.5 [>] Limit flag on Var7.5 56- 57 I2 % Var7.5 [2/88]? Variability of the source at 7.5GHz 59- 60 I2 % e_Var7.5 [6/49]? Uncertainty in Var7.5 61 A1 --- n_Var7.5 [AE] Note on Var7.5 (2) 63 A1 --- l_alpha [<] Limit flag on alpha 64- 67 F4.1 --- alpha ? Spectral index 69- 71 F3.1 --- e_alpha ? Uncertainty in alpha
Note (1): Source as follows: Y = Source without reported counterparts at any frequency; N = Source with known counterpart. Note (2): Note as follows: A = Source not detected at three times the noise level on individual epochs, but detected on the image of the concatenated epochs; E = Sources with extended emission features.
History: From electronic version of the journal References: Dzib et al. Paper I. 2013ApJ...775...63D, Cat. J/ApJ/775/63 Ortiz-Leon et al. Paper II. 2015ApJ...805....9O, Cat. J/ApJ/805/9 Kounkel et al. Paper III. 2014ApJ...790...49K, Cat. J/ApJ/790/49 Dzib et al. Paper IV. 2015ApJ...801...91D, Cat. J/ApJ/801/91
(End) Tiphaine Pouvreau [CDS] 30-Jan-2018
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