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J/MNRAS/406/1853      Sources in VSA fields at 30GHz     (Gawronski+, 2010)

30 GHz observations of sources in the Very Small Array fields. Gawronski M.P., Peel M.W., Lancaster K., Battye R.A., Birkinshaw M., Browne I.W.A., Davies M.L., Davis R.J., Feiler R., Franzen T.M.O., Genova-santos R., Kus A.J., Lowe S.R., Pazderska B.M., Pazderski E., Pooley G.G., Roukema B.F., Waldram E.M., Wilkinson P.N. <Mon. Not. R. Astron. Soc., 406, 1853-1864 (2010)> =2010MNRAS.406.1853G
ADC_Keywords: Radio sources Keywords: cosmology: observations - radio continuum: general - cosmic background radiation Abstract: Small angular scale (high multipole order l) studies of cosmic microwave background (CMB) anisotropies require accurate knowledge of the statistical properties of extragalactic sources at cm-mm wavelengths. We have used a 30GHz dual-beam receiver (One Centimetre Receiver Array prototype) on the Torun 32-m telescope to measure the flux densities of 121 sources in Very Small Array fields selected at 15GHz with the Ryle Telescope. We have detected 57 sources above a limiting flux density of 5mJy, of which 31 sources have a flux density greater than 10mJy, which is our effective completeness limit. From these measurements we derive a surface density of sources above 10mJy at 30GHz of 2.2±0.4deg-2. This is consistent with the surface density obtained by Mason et al. who observed a large sample of sources selected at a much lower frequency (1.4GHz). We have also investigated the dependence of the spectral index distribution on flux density by comparing our results with those for sources above 1Jy selected from the Wilkinson Microwave Anisotropy Probe 22GHz catalogue. Description: The VSA (Very Small Array) has made CMB observations in three different configurations, corresponding to different multipole order (l) ranges: compact for l=150-800 (Taylor et al. 2003, Cat. J/MNRAS/341/1066), extended for l=300-1500 (Dickinson et al. 2004MNRAS.353..732D) and super-extended for l=600-2500. The corresponding areas have been surveyed with the Ryle Telescope (RT) at 15GHz, to a greater depth the higher the l value, in order to identify the sources for subtraction at 33GHz. The five fields analyzed in this paper are those of the VSA super-extended observations. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 90 121 Sources in the VSA fields notes.dat 80 43 Individual notes
See also: VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Source name (JHHMM+DDMMa) 12 A1 --- n_Name [)] for components of a single source 14- 15 I2 h RAh Right ascension (J2000) (1) 17- 18 I2 min RAm Right ascension (J2000) (1) 20- 24 F5.2 s RAs Right ascension (J2000) (1) 26 A1 --- DE- Declination sign (J2000) (1) 27- 28 I2 deg DEd Declination (J2000) (1) 30- 31 I2 arcmin DEm Declination (J2000) (1) 33- 36 F4.1 arcsec DEs Declination (J2000) (1) 38 A1 --- l_S1.4 Limit flag on S1.4 39- 43 F5.1 mJy S1.4 Flux density ay 1.4GHz 45- 48 F4.1 mJy e_S1.4 ? rms uncertainty on S1.4 50- 52 I3 mJy S4.8 ?=- Flux density at 4.8GHz 54- 55 I2 mJy e_S4.8 ? rms uncertainty on S4.8 56 A1 --- n_S4.8 [a] Note (2) 57- 60 F4.1 mJy S15 Flux density at 15GHz 62- 65 F4.1 mJy S30 Flux density at 30GHz 67- 69 F3.1 mJy e_S30 rms uncertainty on S30 71 A1 --- l_alpha Limit flag on spectral index α 72- 76 F5.2 --- alpha ?=- Spectral index between 30GHz and 1.4GHz 78- 81 F4.2 --- E_alpha ? Error on α (upper limit) 83- 86 F4.2 --- e_alpha ? Error on α (lower limit) 87- 88 A2 --- flag [ve ] variable/extended flag (3) 90 A1 --- Note [*] indicates a note in notes.dat file
Note (1): The positions are from the Ryle Telescope (RT) 15GHz observations (see Section 5 for details). Note (2): For sources J1535+4143a/b and J1535+4142, same 4.8GHz flux density. Note (3): Flag is: v = variable source (see Section 6.1) e = extended source in FIRST maps (see Section 6.4)
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Source name 13- 80 A68 --- Note Text of the note
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Feb-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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