J/A+A/549/A55 GMRT 153MHz (2m) Radio Mini Survey I. (Williams+, 2013)
T-RaMiSu: The Two-meter Radio Mini Survey I. The Bootes Field.
Williams W.L., Intema H.T., Rottgering H.J.A.
<Astron. Astrophys. 549, A55 (2013)>
=2013A&A...549A..55W 2013A&A...549A..55W
ADC_Keywords: Surveys ; Active gal. nuclei ; Galaxies, radio
Keywords: techniques: interferometric - surveys - galaxies: active -
radio continuum: galaxies
Abstract:
We present wide area, deep, high-resolution 153MHz GMRT observations
of the NOAO Bootes field, adding to the extensive, multi-wavelength
data of this region. The observations, data reduction, and catalogue
construction and description are described here. The seven pointings
produced a final mosaic covering 30 square degrees with a resolution
of 25". The rms noise is 2mJy/beam in the centre of the image, rising
to 4-5mJy/beam on the edges, with an average of 3mJy/beam.
Seventy-five per cent of the area has an rms <4mJy/beam. The
extracted source catalogue contains 1289 sources detected at 5σ,
of which 453 are resolved. We estimate the catalogue to be 92 per cent
reliable and 95 per cent complete at an integrated flux density limit
of 14mJy. The flux densities and astrometry have been corrected for
systematic errors. We calculate the differential source counts which
are in good agreement with those in the literature and provide an
important step forward in quantifying the source counts at these low
frequencies and low flux densities. The GMRT 153MHz sources have been
matched to the 1.4GHz NVSS and 327MHz WENSS catalogues and spectral
indices were derived.
Description:
The source catalog presented here is derived from seven 4 hour
pointings with the GMRT at 153MHz, centered at the NOAO Bootes field.
The resulting 30 square degree image has a central noise level of
2mJy/beam and a resolution of 25".
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 68 1289 List of sources in the T-RaMiSu
table3.dat 92 1233 List of Gaussian components
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See also:
J/AJ/123/1784 : 1.4GHz imaging of the Bootes field (de Vries+, 2002)
J/AJ/127/213 : LALA Bootes field X-ray source catalog (Wang+, 2004)
J/AJ/130/923 : Faint radio sources in the NOAO Bootes field (Wrobel+, 2005)
J/ApJ/634/L1 : 16 micron sources in the NOAO Bootes field (Kasliwal+, 2005)
J/ApJS/161/9 : X-ray survey of the NDWFS Bootes field (Kenter+, 2005)
J/ApJ/641/140 : Optical counterparts in the NDWFS Bootes field (Brand+, 2006)
J/A+A/535/A38 : Observations of NOAO Bootes field at 153Mhz (Intema+, 2011)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Source identifier (JHHMMSS+DDMM)
14- 22 F9.5 deg RAdeg Centroid right ascension (J2000)
24- 27 F4.1 arcsec e_RAdeg rms uncertainty on RAdeg (1σ)
29- 36 F8.5 deg DEdeg Centroid declination (J2000)
38- 41 F4.1 arcsec e_DEdeg rms uncertainty on DEdeg (1σ)
43- 46 I4 mJy Si 153MHz integrated flux density
48- 51 I4 mJy e_Si rms uncertainty on S153 (1σ)
53- 56 I4 mJy Sp 153MHz peak flux density in mJy/beam
58- 61 I4 mJy e_Sp rms uncertainty on S153 (1σ) in mJy/beam
64- 66 F3.1 mJy Noise Local RMS image noise near source in mJy/beam
68 I1 --- Ng ? Number of gaussians fitted to source (1)
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Note (1): A null indicates a poor Gaussian fit. In these cases the total
flux density quoted is the total flux density in the source island.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Source identifier (JHHMMSS+DDMM)
14 A1 --- m_Name [abc] Component identifier
16- 24 F9.5 deg RAdeg Centroid right ascension (J2000)
26- 29 F4.1 arcsec e_RAdeg rms uncertainty on RAdeg (1σ)
31- 38 F8.5 deg DEdeg Centroid declination (J2000)
40- 43 F4.1 arcsec e_DEdeg rms uncertainty on DEdeg (1σ)
45- 48 I4 mJy Si 153MHz integrated flux density
50- 52 I3 mJy e_Si rms uncertainty on S153 (1σ)
54- 57 I4 mJy Sp 153MHz peak flux density in mJy/beam
59- 61 I3 mJy e_Sp rms uncertainty on S153 (1σ) in mJy/beam
63- 67 F5.1 arcsec a ? Gaussian semi-major axis (1)
69- 72 F4.1 arcsec e_a ? Uncertainty on gaussian semi-major axis (1)
74- 78 F5.1 arcsec b ? Gaussian semi-minor axis (1)
80- 83 F4.1 arcsec e_b ? Uncertainty on gaussian semi-minor axis (1)
85- 88 I4 deg phi ? Gaussian position angle φ (1)
90- 92 I3 deg e_phi ? Uncertainty on gaussian position angle (1)
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Note (1): Parameters are given for extended sources to which Gaussian
components were successfully fit.
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Acknowledgements:
Wendy Williams, wwilliams(at)strw.leidenuniv.nl
(End) Patricia Vannier [CDS] 13-Nov-2012