AT20GBSS - Australia Telescope 20-GHz Survey Bright Source Sample

Overview

The Australia Telescope 20-GHz (AT20G) Survey is a blind survey of the whole southern sky at 20 GHz (with follow-up observations at 4.8 and 8.6 GHz) carried out with the Australia Telescope Compact Array from 2004 to 2007. The Bright Source Sample (BSS) is a complete flux-limited sub-sample of the AT20G Survey catalog comprising 320 extragalactic (|b| > 1.5 degrees) radio sources south of declination -15 degrees with 20-GHz flux densities S_20GHz > 0.50 Jy (500 mJy). Of these sources, 218 have near simultaneous observations at 8 and 5 GHz.

In the reference paper, the authors present an analysis of the radio spectral properties in total intensity and polarization, size, optical identifications and redshift distribution of the BSS sources. Optical identifications provided an estimation of redshift for 186 sources with median values of 1.20 and 0.13 for QSOs and galaxies, respectively.

Catalog Bibcode

2008MNRAS.384..775M

References

The Australia Telescope 20-GHz (AT20G) Survey: the Bright Source Sample.
    Massardi M., Ekers R.D., Murphy T., Ricci R., Sadler E.M., Burke S.,
    De Zotti G., Edwards P.G., Hancock P.J., Jackson C.A., Kesteven M.J.,
    Mahony E., Phillips C.J., Staveley-Smith L., Subrahmanyan R., Walker M.A.,
    Wilson W.E.
   <Mon. Not. R. Astron. Soc., 384, 775-802 (2008)>
   =2008MNRAS.384..775M    (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in August 2008 based on the CDS Catalog J/MNRAS/384/775 files table2.dat and table3.dat.

HEASARC Implementation

The HEASARC has converted all flux densities (both total and polarized) from the Jy units given in the original CDS table into the mJy units which it uses in its tables for radio-band flux densities.

Parameters

Source_Number
A unique identification number for each radio source in the catalog, in order of increasing J2000.0 Right Ascension.

Name
The name for the radio source using the '[MEM2008]' prefix (for Massardi, Ekers, Murphy 2008) and the value of the source number parameter, as recommended by the CDS Dictionary of Nomenclature of Celestial Objects, e.g., '[MEM2008] 1'.

Note_Flag
This parameter is a flag which if set to 'Y' indicates that there is a note about this source (identified by its source number) in the file http://cdsarc.u-strasbg.fr/ftp/cats/J_MNRAS/384/775/notes.dat.

RA
The Right Ascension of the radio source centroid in the selected equinox. The RA was given in J2000.0 coordinates to a precision of 0.01 seconds of time in the original table. The average error in RA and Dec is 0.5 arcseconds (see Section 3.4 of the reference paper).

Dec
The Declination of the radio source centroid in the selected equinox. The Dec was given in J2000.0 coordinates to a precision of 0.1 arcseconds in the original table. The average error in RA and Dec is 0.5 arcseconds (see Section 3.4 of the reference paper).

LII
The Galactic Longitude of the radio source.

BII
The Galactic Latitude of the radio source.

AT20G_Name
The name of the radio source using the 'AT20G' prefix (for Australia Telescope, 20 GHz) and the J2000 coordinates of the source in the HHMMSS.s-DDMMSS format recommended by the CDS Dictionary of Nomenclature of Celestial Objects. Notice that this differs slightly from the (non-standard) naming scheme in the reference paper where the authors suggested names in the format 'AT20G JHHMMSS-DDMMSS', i.e., with less precision in RA.

Flux_1p5_cm_Limit
This flag is set to '>' if the flux density at 20 GHz is a lower limit to the actual flux density.

Flux_1p5_cm
The flux density of the radio source at 20 GHz, in mJy.

Flux_1p5_cm_Error
The RMS uncertainty of the corresponding flux density, in mJy.

Flux_3p5_cm
The flux density of the radio source at 8 GHz, in mJy. Whenever available, the authors give the results of 5 and 8-GHz observations almost simultaneous to the 20-GHz ones, otherwise they refer to the best observations available for the source at each frequency.

Flux_3p5_cm_Error
The RMS uncertainty of the corresponding flux density, in mJy.

Flux_6_cm
The flux density of the radio source at 5 GHz, in mJy. Whenever available, the authors give the results of 5 and 8-GHz observations almost simultaneous to the 20-GHz ones, otherwise they refer to the best observations available for the source at each frequency.

Flux_6_cm_Error
The RMS uncertainty of the corresponding flux density, in mJy.

Flux_20_cm
The flux density of the radio source at 1.4 GHz, in mJy, from the National Radio Astronomy Observatory (NRAO) Very Large Array (VLA) Sky Survey (NVSS: Condon et al. 1998, AJ, 115, 1693).

Flux_20_cm_Error
The RMS uncertainty of the corresponding flux density, in mJy.

Flux_36_cm
The flux density of the radio source at 843 MHz, in mJy, from SUMSS (Version 2.0: Mauch et al. 2003, MNRAS, 342, 11117 and Mauch et al. 2007, yCat, 8081).

Flux_36_cm_Error
The RMS uncertainty of the corresponding flux density, in mJy.

Redshift
The redshift of the source, obtained as discussed in Section 5.5 of the reference paper.

Ref_Redshift
The reference code for the quoted redshift as follows:

  (SSO) New redshifts from SSO 2.3 m;
  (ESO) Edwards et al. (in preparation);
  (2QZ) Croom et al. 2004, MNRAS, 349, 1397;
  (6dF) Jones et al. 2004, MNRAS, 355, 747 (6dF Galaxy Survey);
  (FCSS) Drinkwater et al. 2000, A&A, 355, 900 and Fornax online catalog;
  (RC3) de Vaucouleurs et al. 1991, Third Reference Catalogue of Bright Galaxies;
  (Al94) di Serego Alighieri et al. 1994, MNRAS, 269, 998;
  (Ar67) Arp et al. 1967, ApJ, 147, 840;
  (Ba95) Baker et al. 1995, MNRAS, 277, 553;
  (Br75) Browne et al. 1975, MNRAS, 173, 87p;
  (Br77) Browne & Savage, 1977, MNRAS, 179, 65p;
  (Ca00) Caccianiga et al. 2000, A&AS, 144, 247;
  (Da79) Danziger et al. 1979, MNRAS, 186, 93;
  (Da91) Da Costa et al. 1991, ApJS, 75, 935;
  (di94) di Serego Alighieri, 1994, MNRAS, 269, 998;
  (De84) Dekker & D'Odorico, 1984, ESO Messenger, 37, 7;
  (Dr97) Drinkwater et al. 1997, MNRAS, 284, 85;
  (El01) Ellison et al. 2001, A&A, 379, 393;
  (Fa87) Falomo et al. 1987, ApJ, 318, L39;
  (Fr83) Fricke et al. 1983, A&A, 117, 60;
  (Go98) Gonclaves et al. 1998, A&AS, 127, 107;
  (Gr83) Grandi, 1983, MNRAS, 204, 691;
  (Ha03) Halpern et al. 2003, AJ, 125, 572;
  (He04) Heidt et al. 2004, A&A, 418, 813;
  (Hu78) Hunstead et al. 1978, MNRAS, 185, 149;
  (Hu78) Hunstead et al. 1980, MNRAS, 192, 31p;
  (Io96) Iovino et al. 1996, A&AS, 119, 265;
  (Ja78) Jauncey et al. 1978, ApJ, 218, L1;
  (Ja82) Jauncey et al. 1982, AJ, 87, 763;
  (Ja84) Jauncey et al. 1984, ApJ, 286, 498;
  (Ja02) Jackson et al. 2002, A&A, 386, 97;
  (Ke85) Keel, 1985, AJ, 90, 2207;
  (La01) Landt et al. 2001, MNRAS, 323, 757;
  (Lo96) Loveday et al. 1996, ApJS, 107, 201L;
  (Ma95) Maza et al. 1995, Rev. Mex. Astron. Astrofis., 31, 119;
  (Mo78) Morton et al. 1978, MNRAS, 185, 735;
  (Mo82) Morton et al. 1982, MNRAS, 198, 669;
  (Mu84) Murdoch et al. 1984, Publ. Astron. Soc. Aust., 5, 341;
  (Od91) O'Dea et al. 1991, ApJ, 380, 66O;
  (Os94) Osmer et al. 1994, ApJ, 436, 678;
  (Pe72) Peterson & Bolton, 1972, ApJ, 173, L19;
  (Pe76) Peterson et al. 1976, ApJ, 207, L5;
  (Pe98) Perlman et al. 1998, AJ, 115, 1253;
  (Pi98) Pietsch et al. 1998, A&A, 333, 48;
  (Qu95) Quintana et al. 1995, ApJS, 96, 343;
  (Ro77) Rodgers & Peterson, 1977, ApJ, 212, L9;
  (Sa76) Savage et al. 1976, MNRAS, 177, 77;
  (Sb05) Sbarufatti et al. 2005, AJ, 129, 559;
  (Sb06) Sbarufatti et al. 2006, AJ, 132, 1;
  (Sc65) Schmidt, 1965, ApJ, 141, 1;
  (St89) Stickel et al. 1989, A&AS, 80, 103;
  (St93) Stickel et al. 1993, A&AS, 98, 393;
  (St94) Stickel et al. 1994, A&AS, 105, 211;
  (Su04) Sulentic et al. 2004, A&A, 423, 121;
  (Ta93) Tadhunter et al. 1993, MNRAS, 263, 999;
  (Ta01) Tadhunter et al. 2001, MNRAS, 327, 227;
  (Th90) Thompson et al. 1990, PASP, 102, 1235;
  (Wh88) White et al. 1988, ApJ, 327, 561;
  (Wi76) Wills & Wills, 1976, ApJS, 31, 143;
  (Wi83) Wilkes et al. 1983, Publ. Astron. Soc. Aust., 5, 2;
  (Wi86) Wilkes, 1986, MNRAS, 218, 331;
  (Wi00) Wisotzki et al. 2000, A&A, 358, 77;
  (Wr77) Wright et al. 1977, ApJ, 211, L115;
  (Wr79) Wright et al. 1979, ApJ, 229, 73;
  (Wr83) Wright et al. 1983, MNRAS, 205, 793.

BJ_Mag
The optical B Magnitude of the source, for sources with SuperCOSMOS2 counterparts.

Optical_Id_Code
A flag parameter giving the SuperCOSMOS identification of the source: 'G' for galaxies, 'Q' for QSOs. A blank space indicates that no identification was possible (see Section 5.5 of the reference paper).

FIRST_Epoch_1p5_cm
This flag parameter indicates the first epoch of the 20-GHz observation of the radio source, where the epochs 1-6 are defined in Table 1 of the reference paper.

Second_Epoch_1p5_cm
This flag parameter indicates the second epoch of the 20-GHz observation of the radio source, where the epochs 1-6 are defined in Table 1 of the reference paper.

Spectral_Shape_Flag
This flag parameter indicates the spectral shape: 'F' for flat, 'I' for inverted, 'P' for peaked, 'S' for steep, 'U' for upturning, as in Table 4 of the reference paper.

Galactic_Plane_Flag
This flag parameter indicates the Galactic position: a 'G' indicates that the source is within 10 degrees of the Galactic plane.

Epoch_3p5_cm
This flag parameter indicates the epoch of observation at 8 GHz in the case of not simultaneous observations (numbers refer to the epoch reference numbers in Table 1 of the reference paper): in such cases, the authors have listed the flux densities measured in the best observation available to them.

Epoch_6_cm
This flag parameter indicates the epoch of observation at 5 GHz in the case of not simultaneous observations (numbers refer to the epoch reference numbers in Table 1 of the reference paper): in such cases, the authors have listed the flux densities measured in the best observation available to them.

Extent_Flag
This flag parameter indicates the extendedness: 'E' if the source is extended at 20 GHz, 'M' if it has been observed in the mosaic mode. The flux density for the 'M' sources corresponds to the integrated flux density of the source in the mosaic area.

Calibrator_Flag
This flag parameter if set to 'C' indicates that the source is listed in the AT calibrator manual.

Alt_Name
An alternative name for the radio source from other well-known radio-frequency catalogs, e.g., PMN, PKS, NVSS,.

Wmap_Source_Number
The identification number for the source in the WMAP 1-yr catalog (Bennett et al. 2003, ApJS, 148, 97).

Pol_Flux_1p5_cm_Limit
This flag is set to '<' if the corresponding integrated polarized flux density is an upper limit to the actual value.

Pol_Flux_1p5_cm
The integrated polarized flux density of the radio source at 20 GHz, in mJy.

Pol_Flux_1p5_cm_Error
The RMS uncertainty in the corresponding integrated polarized flux density, in mJy.

Pol_Percent_1p5_cm
The fractional polarization of the radio source at 20 GHz, in percent.

Pol_Angle_1p5_cm
The polarization angle of the radio source at 20 GHz, in degrees.

Pol_Flux_3p5_cm_Limit
This flag is set to '<' if the corresponding integrated polarized flux density is an upper limit to the actual value.

Pol_Flux_3p5_cm
The integrated polarized flux density of the radio source at 8 GHz, in mJy.

Pol_Flux_3p5_cm_Error
The RMS uncertainty in the corresponding integrated polarized flux density, in mJy.

Pol_Percent_3p5_cm
The fractional polarization of the radio source at 8 GHz, in percent.

Pol_Angle_3p5_cm
The polarization angle of the radio source at 8 GHz, in degrees.

Pol_Flux_6_cm_Limit
This flag is set to '<' if the corresponding integrated polarized flux density is an upper limit to the actual value.

Pol_Flux_6_cm
The integrated polarized flux density of the radio source at 5 GHz, in mJy.

Pol_Flux_6_cm_Error
The RMS uncertainty in the corresponding integrated polarized flux density, in mJy.

Pol_Percent_6_cm
The fractional polarization of the radio source at 5 GHz, in percent.

Pol_Angle_6_cm
The polarization angle of the radio source at 5 GHz, in degrees.

Contact Person

Questions regarding the AT20GBSS database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:24:33 EDT