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J/ApJ/704/1433     31GHz survey of low-frequency radio sources    (Mason+, 2009)

A 31 GHz survey of low-frequency selected radio sources. Mason B.S., Weintraub L., Sievers J., Bond J.R., Myers S.T., Pearson T.J., Readhead A.C.S., Shepherd M.C. <Astrophys. J., 704, 1433-1447 (2009)> =2009ApJ...704.1433M
ADC_Keywords: Radio continuum ; Surveys ; Active gal. nuclei Keywords: cosmic microwave background - cosmology: observations - galaxies: active - radio continuum: galaxies Abstract: The 100m Robert C. Byrd Green Bank Telescope and the 40m Owens Valley Radio Observatory telescope have been used to conduct a 31GHz survey of 3165 known extragalactic radio sources over 143deg2 of the sky. Target sources were selected from the NRAO VLA Sky Survey in fields observed by the Cosmic Background Imager (CBI); most are extragalactic active galactic nuclei (AGNs) with 1.4GHz flux densities of 3-10mJy. The resulting 31GHz catalogs are presented in full online. Using a maximum-likelihood analysis to obtain an unbiased estimate of the distribution of the 1.4-31GHz spectral indices of these sources, we find a mean 31-1.4GHz flux ratio of 0.110±0.003 corresponding to a spectral index of α=-0.71±0.01 (Sν∝να); 9.0%±0.8% of sources have α>-0.5 and 1.2%±0.2% have α>0. By combining this spectral-index distribution with 1.4GHz source counts, we predict 31GHz source counts in the range 1mJy<S31<4mJy, N(>S31)=(16.7±1.7)deg-2(S31/1mJy)-0.80±0.07. Description: In this paper, we present a detailed characterization of the impact of the discrete source foreground on arcminute-scale 31GHz anisotropy measurements based upon two observational campaigns. The first campaign was carried out with the Owens Valley Radio Observatory (OVRO) 40m telescope at 31GHz from 2000 September through 2002 December. The second campaign used the Robert C. Byrd Green Bank Telescope (GBT) from 2006 February to May. A companion paper (Sievers et al. 2009arXiv0901.4540S) presents the five-year CBI total intensity power spectrum incorporating the results of the point-source measurements discussed here. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 81 1674 OVRO 40-m 31GHz survey results (2002 September through 2002 December) table3.dat 81 1490 GBT 100-m 31GHz survey results (2006 February through 2006 May)
See also: VIII/85 : SPECFIND V2.0 Catalog of radio continuum spectra (Vollmer+ 2009) VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) J/A+A/501/801 : CBI sample at 4.85GHz and 10.45GHz (Angelakis+, 2009) Byte-by-byte Description of file: table[23].dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name NVSS source name (HHMMSS+DDMM; <NVSS JHHMMSS+DDMMSS> in Simbad) 13- 14 I2 h RAh Hour of Right Ascension (J2000) 16- 17 I2 min RAm Minute of Right Ascension (J2000) 19- 23 F5.2 s RAs Second of Right Ascension (J2000) 25 A1 --- DE- Sign of the Declination (J2000) 26- 27 I2 deg DEd Degree of Declination (J2000) 29- 30 I2 arcmin DEm Arcminute of Declination (J2000) 32- 35 F4.1 arcsec DEs Arcsecond of Declination (J2000) 37- 43 F7.2 mJy S31 The 31GHz flux density 45- 49 F5.2 mJy e_S31 Uncertainty in S31 51- 58 F8.2 mJy S1.4 The 1.4GHz NVSS integrated flux density 60- 65 F6.2 mJy e_S1.4 Uncertainty in S1.4 67- 71 F5.1 arcsec amaj ?=0 The 1.4GHz NVSS major axis 73- 77 F5.1 arcsec bmin ?=0 The 1.4GHz NVSS minor axis 79 A1 --- D [*] *: Indicates detection ≥ 4σ 81 A1 --- C [*] *: Indicates confusion-corrected flux (see Appendix A)
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 25-Nov-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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