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 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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 90 121 Sources in the VSA fields
notes.dat 80 43 Individual notes
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See also:
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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
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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)
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Source name
13- 80 A68 --- Note Text of the note
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Feb-2011