J/MNRAS/462/2904 Final GMRT-TAU catalogue (Ainsworth+, 2016)
A GMRT survey of regions towards the Taurus molecular cloud at 323 and 608 MHz.
Ainsworth R.E., Coughlan C.P., Green D.A., Scaife A.M.M., Ray T.P.
<Mon. Not. R. Astron. Soc., 462, 2904-2917 (2016)>
=2016MNRAS.462.2904A 2016MNRAS.462.2904A (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Molecular clouds ; Radio sources
Keywords: catalogues - surveys - radio continuum: galaxies
Abstract:
We present observations of three active sites of star formation in the
Taurus molecular cloud complex taken at 323 and 608MHz (90 and 50cm,
respectively) with the Giant Metrewave Radio Telescope (GMRT). Three
pointings were observed as part of a pathfinder project, targeted at
the young stellar objects (YSOs) L1551 IRS 5, T Tau and DG Tau (the
results for these target sources were presented in a previous paper).
In this paper, we search for other YSOs and present a survey
comprising of all three fields; a by-product of the large
instantaneous field of view of the GMRT. The resolution of the survey
is of order 10 arcsec and the best rms noise at the centre of each
pointing is of order 100µJy/beam at 323MHz and 50µJy/beam at
608MHz. We present a catalogue of 1815 and 687 field sources detected
above 5σrms at 323 and 608MHz, respectively. A total of 440
sources were detected at both frequencies, corresponding to a total
unique source count of 2062 sources. We compare the results with
previous surveys and showcase a sample of extended extragalactic
objects. Although no further YSOs were detected in addition to the
target YSOs based on our source-finding criteria, these data can be
useful for targeted manual searches, studies of radio galaxies or to
assist in the calibration of future observations with the
Low-Frequency Array towards these regions.
Description:
The details of the observations and data reduction using the
Astronomical Image Processing Software (aips) were presented in
Ainsworth et al. (2016MNRAS.459.1248A 2016MNRAS.459.1248A).
Observations centred on the young stars L1551 IRS 5, T Tau and DG Tau
were made with the GMRT (see e.g. Ananthakrishnan, 2005, Int. Cosm.
Ray Conf. 10 125) in 325 and 610 MHz observing modes between 2012
December 6 and 14 (average epoch 2012.95).
Observations of 3C48, 3C147 or 3C286 were made at the beginning and
end of each observing run to calibrate the flux-density scale.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 151 2062 The final GMRT-TAU catalogue
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See also:
II/332 : c2d Spitzer final data release (DR4) (Evans+, 2003)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
J/A+A/468/353 : XMM-Newton Extended Survey of Taurus (Guedel+, 2007)
J/ApJ/801/91 : Gould's Belt Very Large Array survey. IV. Taurus (Dzib+, 2015)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name GMRT-TAU name (JHHMMSS.ss+DDMMSS.s)
21- 22 I2 h RAh Right ascension (J2000.0)
24- 25 I2 min RAm Right ascension (J2000.0)
27- 32 F6.3 s RAs Right ascension (J2000.0)
34 A1 --- DE- Declination sign (J2000.0)
35- 36 I2 deg DEd Declination (J2000.0)
38- 39 I2 arcmin DEm Declination (J2000.0)
41- 45 F5.2 arcsec DEs Declination (J2000.0)
47- 53 F7.2 mJy/beam Sp323 ?=- 323MHz peak flux density
55- 59 F5.2 mJy/beam e_Sp323 ? rms uncertainty on 323MHz peak
flux density
62- 68 F7.2 mJy Si323 ?=- 323MHz integrated flux density
70- 75 F6.2 mJy e_Si323 ? rms uncertainty on 323MHz integrated
flux density
77- 80 I4 uJy/beam Res323 ?=- Local noise at 323MHz
82 A1 --- SCode323 [CMS-] PYBDSM code at 323MHz (1)
84- 89 F6.2 mJy/beam Sp608 ?=- 608MHz peak flux density
91- 95 F5.2 mJy/beam e_Sp608 ? rms uncertainty on 608MHz peak
flux density
97-102 F6.2 mJy Si608 ?=- 608MHz integrated flux density
104-108 F5.2 mJy e_Si608 ? rms uncertainty on 608MHz integrated
flux density
110-114 I5 uJy/beam Res608 ?=- Local noise at 608MHz
116 A1 --- SCode608 [CMS-] PYBDSM code at 608MHz (1)
118-122 F5.2 --- alphaGMRT ?=- GMRT spectral index α for sources
detected at both 323 and 608MHz
124-127 F4.2 --- e_alphaGMRT ?=- rms uncertainty on GMRT spectral index
129 A1 --- NVSS [LBH-] Cross-reference with NVSS code (2)
131-135 F5.2 --- alphaNVSS ?=- NVSS spectral index α (3)
137-140 F4.2 --- e_alphaNVSS ?=- rms uncertainty on NVSS spectral index
142-151 A10 --- Ctp Known counterparts (4)
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Note (1): PYBDSM codes as follows:
S = single-Gaussian source that is the only source in the island of emission
C = single-Gaussian source in an island with other sources
M = multi-Gaussian source
Note (2): Cross-reference with NVSS code as follows:
L = a match with the lower frequency (323MHz) GMRT data only
H = a match with the higher frequency (608MHz) GMRT data only
B = indicates a match with both GMRT frequencies.
Note (3): The corresponding GMRT to NVSS spectral index alphaNVSS is generated
using two frequencies in the case of an 'L' or 'H' match, and
three frequencies in the case of a 'B' match.
Note (4): the known counterparts of a source cross-referenced with
G = GBS-VLA (Dzib et al., 2015, Cat. J/ApJ/801/91)
N = NVSS (Condon et al., 1998AJ....115.1693C 1998AJ....115.1693C, Cat. VIII/65)
X = XMM-Newton extended survey of the Taurus molecular cloud
(XEST; Gudel et al., 2007, Cat. J/A+A/468/353)
2M = Two Micron All Sky Survey
(2MASS; Skrutskie et al., 2006AJ....131.1163S 2006AJ....131.1163S, Cat. VII/233)
S = Spitzer c2d Legacy Program
(Evans et al., 2003PASP..115..965E 2003PASP..115..965E, Cat. II/332)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Feb-2018