J/MNRAS/360/340 Very Small Array. Flux density at 33GHz (Cleary+, 2005)
Source subtraction for the extended Very Small Array and 33-GHz source
count estimates.
Cleary K.A., Taylor A.C., Waldram E., Battye R.A., Dickinson C.,
Davies R.D., Davis R.J., Genova-Santos R., Grainge K., Jones M.E.,
Kneissl R., Pooley G.G., Rebolo R., Rubino-Martin J.A., Saunders R.D.E.,
Scott P.F., Slosar A., Titterington D., Watson R.A.
<Mon. Not. R. Astron. Soc., 360, 340-353 (2005)>
=2005MNRAS.360..340C 2005MNRAS.360..340C
ADC_Keywords: Surveys ; Radio sources
Keywords: surveys - cosmic microwave background - radio continuum: galaxies
Abstract:
We describe the source subtraction strategy and observations for the
extended Very Small Array (VSA), a cosmic microwave background
interferometer operating at 33GHz. A total of 453 sources were
monitored at 33GHz using a dedicated source subtraction baseline.
131 sources brighter than 20mJy were directly subtracted from the VSA
visibility data. Some characteristics of the subtracted sources, such
as spectra and variability, are discussed. The 33GHz source counts
are estimated from a sample selected at 15GHz. The selection of VSA
fields in order to avoid bright sources introduces a bias into the
observed counts. This bias is corrected and the resulting source count
is estimated to be complete in the flux-density range 20114mJy. The
33GHz source counts are used to calculate a correction to the VSA
power spectrum for sources below the subtraction limit.
Erratum:
Table A1 of Cleary et al. (2005) was described as listing the 33-GHz
sources used for the source-count estimation. However, an error was
made in generating the text of Table A1. This erratum gives the
correct source list used for the counts. This error does not affect
any of the results of the paper, as the correct source list was used
to estimate the counts.
Of the 102 sources which were used to estimate the counts, 45 came
from the VSA123 fields with 20mJy≤S< 46mJy and 57 came from the
VSA5678 fields with 20mJy≤S< 114mJy. However, Table A1 of Cleary et
al. (2005) omits (in error) nine sources from VSA123 with
35.9mJy≤S<46mJy and includes (in error) three sources from VSA5678
with S>114mJy. Also, for some sources the quoted uncertainty was a
factor of sqrt(2) too large.
Table 1 below lists the 102 sources used to estimate the 33-GHz source
counts in Cleary et al. (2005). The normalizing area for the source
counts is 0.044sr except for those sources brighter than 46mJy, for
which it is 0.024sr. For each source, the measured flux density, S,
and 1sigma uncertainty, ΔS, in mJy are presented. In addition to
the quoted error, there is a calibration uncertainty of ∼4 per cent in
flux density.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 43 102 33-GHz source flux densities
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See also:
J/MNRAS/341/1066 : Very Small Array. II. CMB at 34GHz (Taylor+, 2003)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- [CTW2005] Name, HHMM+DDMM, based on J2000 positions
10 A1 --- m_[CTW2005] Multiplicity index on [CTW2005]
11 A1 --- n_[CTW2005] [*] * for sources brighter than 46mJy (1)
13- 14 I2 h RAh Right ascension (J2000)
16- 17 I2 min RAm Right ascension (J2000)
19- 22 F4.1 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 32 I2 arcsec DEs Declination (J2000)
34- 38 F5.1 mJy S33GHz Flux density at 33GHz
40- 43 F4.1 mJy e_S33GHz rms uncertainty on S33GHz
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Note (1): The normalizing area for the source counts is 0.044sr except for
those sources brighter than 46mJy (indicated by an asterisk), for
which it is 0.024sr.
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History:
* 17-Mar-2006: From electronic version of the journal
* 09-Dec-2009: Corrected table from erratum, 2008, MNRAS, 386, 1759
(End) Patricia Vannier [CDS] 09-Dec-2009