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SZA31GHZ - Sunyaev-Zel'dovich Array 31-GHZ Radio Source Catalog

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Overview

This table contains the first sample of 31-GHz selected sources to flux levels of 1 mJy. From late-2005 to mid-2007, the Sunyaev-Zel'dovich Array (SZA) observed 7.7 deg2 of the sky at 31 GHz to a median rms of 0.18 mJy/beam. The authors identify 209 sources at greater than 5-sigma significance in the 31-GHz maps, ranging in flux from 0.7 mJy to ~200 mJy. Archival NRAO VLA Sky Survey (NVSS) data at 1.4 GHz and observations at 5 GHz with the Very Large Array are used to characterize the sources. The authors determine the maximum-likelihood integrated source count to be N(>S) = (27.2 +/- 2.5) deg-2 * (SmJy)^(-1.18 +/- 0.12)^ over the flux range 0.7 - 15 mJy. This result is significantly higher than predictions based on 1.4-GHz selected samples, a discrepancy which can be explained by a small shift in the spectral index distribution for faint 1.4-GHz sources. From comparison with previous measurements of sources within the central arcminute of massive clusters, the authors derive an overdensity of 6.8 +/- 4.4 deg-2, relative to field sources.

The SZA is an interferometer designed specifically for detecting and imaging the Sunyaev-Zel'dovich (SZ) effect in galaxy clusters, and is located at the Owens Valley Radio Observatory (OVRO). The SZA is equipped with an 8-GHz wideband correlator and sensitive 26GHZ-36GHz receivers. The data in the SZA survey correspond to 1493 tracks taken between 2005 November 13 and 2007 July 25. The data in the CMB anisotropy measurements correspond to an additional 414 tracks taken between 2005 November 12 and 2007 October 25. The analysis in this paper refers to the full 1907 tracks taken in both observing modes.

To complement the NVSS and FIRST observations, the authors obtained high-sensitivity VLA observations at 5 GHz between 2007 February 24 and 2007 April 15.


Catalog Bibcode

2010ApJ...716..521M

References

Radio sources from a 31 GHz sky survey with the Sunyaev-Zel'dovich Array.
    Muchovej S., Leitch E., Carlstrom J.E., Culverhouse T., Greer C.,
    Hawkins D., Hennessy R., Joy M., Lamb J., Loh M., Marrone D.P., Miller A.,
    Mroczkowski T., Pryke C., Sharp M., Woody D.
   <Astrophys. J., 716, 521-529 (2010)>
   =2010ApJ...716..521M    (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in June 2102 based on CDS Catalog J/ApJ/716/521 file table3.dat.

Parameters

Name
The name of the 31-GHz source. The HEASARC created these names using the Dictionary of Nomenclature of Celestial Objects methodology, viz they are of the form '[MLC 2010] JHHMMSS.s+DDMMSS', where the prefix stands for Muchovej, Leitch, Carlstrom 2010 and the numerical string is the J2000.0 equatorial position of the source.

RA
The Right Ascension of the radio source in the selected equinox. This was given in J2000.0 coordinates to a precision of 0.01 seconds of time in the original table.

Dec
The Declination of the radio source in the selected equinox. This was given in J2000.0 coordinates to a precision of 0.01 arcseconds in the original table.

LII
The Galactic Longitude of the radio source.

BII
The Galactic Latitude of the radio source.

Cor_Flux_31_GHz
The SZA 31-GHz flux density of the radio source, in mJy, corrected for 'boosting' in the presence of noise (i.e., the St parameter in Eq. 13 of the reference paper).

Cor_Flux_31_GHz_Pos_Err
The upper uncertainty in the corrected SZA 31-GHz flux density, in mJy. These errors do not reflect the uncertainties in the absolute flux calibration.

Cor_Flux_31_GHz_Neg_Err
The lower uncertainty in the corrected SZA 31-GHz flux density, in mJy. These errors do not reflect the uncertainties in the absolute flux calibration.

Flux_31_GHz
The best-fit 31-GHz flux density of the radio source, in mJy, not corrected for 'boosting' in the presence of noise (i.e., the S parameter in Eq. 13 of the reference paper).

SNR_31_GHz
The significance (signal-to-noise ratio, S/N) of the 31-GHz detection in the composite mosaics.

Flux_5_GHz_Limit
This flag parameter is set to '<' if the corresponding flux density is an upper limit rather than a detection.

Flux_5_GHz
The VLA 5-GHz flux density of the radio source, in mJy. Note that the 5-GHz map RMS is 68 uJy/beam.

Flux_1p4_GHz_Limit
This flag parameter is set to '<' if the corresponding flux density is an upper limit rather than a detection.

Flux_1p4_GHz
The NVSS Catalog 1.4-GHz flux density of the radio source, in mJy.

Flux_1p4_GHz_Flag
This flag parameter is set to 'f' if multiple sources at 31 GHz correspond to a single source in the NVSS catalog. In such cases, the 31-GHz fluxes of the multiple sources were combined in constructing the 1.4-GHz to 31-GHz spectral index.


Contact Person

Questions regarding the SZA31GHZ database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 26-Jun-2012