CDROM/APJS/V103/P427 GB6 Catalog of Radio Sources (Gregory+ 1996) ================================================================================ The GB6 Catalog of Radio Sources P. C. Gregory, W. K. Scott, K. Douglas, & J. J. Condon <1996, ApJS, 103, 427> =1996ApJS..103..427G ================================================================================ Abstract: The Green Bank 4.85 GHz (lambda ~ 6 cm) survey was made with the NRAO seven-beam receiver on the (former) 91 m telescope during 1986 November and 1987 October. The final set of sky maps covering the declination band 0 deg < Dec. < +75 deg was constructed with data from both epochs. Its noise and position errors are nearly a factor of 2^(1/2) smaller than in the epoch 1987 maps, from which the 87GB catalog of 54,579 sources stronger than S ~ 25 mJy was extracted. Therefore, we used the new maps to make the GB6 catalog of 75,162 discrete sources with angular sizes phi <= 10.5 arcmin and flux densities S >= 18 mJy. This catalog is available in machine-readable versions with either B1950 or J2000 positions and as a printed book with B1950 positions. The GB6 weighted differential source counts S^(5/2)n(S) between 18 mJy and 7 Jy agree well with evolutionary models based on independent data. Keywords: catalogs -- radio continuum: galaxies -- surveys Description: The final set of sky maps from the Green Bank 4.85 GHz survey (Condon, J. J., Broderick, J. J., Seielstad, G. A., Douglas, K., & Gregory, P. C. 1994, AJ, 107, 1829) was used to construct the GB6 Catalog of sources stronger than S ~ 18 mJy in the declination range 0 deg < Dec. < +75 deg (Gregory, P. C., Scott, W. K., Douglas, K., & Condon, J. J. 1996, ApJS, 103, 427). There are two machine-readable versions of the GB6 catalog, with coordinates precessed to B1950 (file b1950.dat) and J2000 (file j2000.dat). Each catalog file contains one line per source (75,162 lines each), and the sources are sorted by increasing B1950 or J2000 right ascension. File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- b1950.dat 80 75162 GB6 catalog, B1950 coordinates j2000.dat 80 75162 GB6 catalog, J2000 coordinates -------------------------------------------------------------------------------- Byte-per-byte Description of file: b1950.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 h RAh Right ascension (B1950) 3- 4 I2 min RAm R.A. 5- 8 F4.1 s RAs R.A. 9-12 F4.1 s u_RA Uncertainty in R.A. 13 1X --- --- Blank 14 A1 --- DE- Sign of declination (B1950) 15-16 I2 deg DEd Declination 17-18 I2 arcmin DEm Dec. 19-20 I2 arcsec DEs Dec. 21-23 I3 arcsec u_DE Uncertainty in declination 24-29 F6.1 deg GLat Galactic latitude 30-35 F6.1 deg GLon Galactic longitude 36-41 I6 mJy Flux 4.85 GHz peak flux density 42-46 I5 mJy u_Flux Uncertainty in peak flux density 47-48 2X --- --- Blank 49 A1 --- n1_Flux 'E' for significant extension 50 A1 --- n2_Flux 'W' for warning 51 A1 --- n3_Flux 'C' for confusion 52-56 F5.2 --- a Fitted major axis / beam size 57-61 F5.2 --- b Fitted minor axis / beam size 62-65 I4 deg PA Fitted major axis position angle (degrees east of north) 66-69 I4 mJy/beam Z Local sky level, Z 70-74 I5 --- Map_X Map pixel column number (from left) 75-79 I5 --- Map_Y Map pixel row number (from bottom) -------------------------------------------------------------------------------- Byte-per-byte Description of file: j2000.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 h RAh Right ascension (J2000) 3- 4 I2 min RAm R.A. 5- 8 F4.1 s RAs R.A. 9-12 F4.1 s u_RA Uncertainty in R.A. 13 1X --- --- Blank 14 A1 --- DE- Sign of declination (J2000) 15-16 I2 deg DEd Declination 17-18 I2 arcmin DEm Dec. 19-20 I2 arcsec DEs Dec. 21-23 I3 arcsec u_DE Uncertainty in declination 24-29 F6.1 deg GLat Galactic latitude 30-35 F6.1 deg GLon Galactic longitude 36-41 I6 mJy Flux 4.85 GHz peak flux density 42-46 I5 mJy u_Flux Uncertainty in peak flux density 47-48 2X --- --- Blank 49 A1 --- n1_Flux 'E' for significant extension 50 A1 --- n2_Flux 'W' for warning 51 A1 --- n3_Flux 'C' for confusion 52-56 F5.2 --- a Fitted major axis / beam size 57-61 F5.2 --- b Fitted minor axis / beam size 62-65 I4 deg PA Fitted major axis position angle (degrees east of north) 66-69 I4 mJy/beam Z Local sky level, Z 70-74 I5 --- Map_X Map pixel column number (from left) 75-79 I5 --- Map_Y Map pixel row number (from bottom) -------------------------------------------------------------------------------- ================================================================================ (End)