GB6 - Green Bank 6-cm (GB6) Radio Source Catalog
The GB6 catalog of radio sources Gregory P.C., Scott W.K., Douglas K., Condon J.J. <Astrophys. J. Suppl. Ser. 103, 427 (1996)> =1996ApJS..103..427G
The GB6 source designation based on the J2000 position.
The Right Ascension of the radio source in the selected equinox. This was given to a precision of 0.1 seconds of time in the original table.
The Declination of the radio source in the selected equinox. This was given to a precision of 1 arcsecond in the original table.
The Galactic Longitude of the radio source.
The Galactic Latitude of the radio source.
The rms uncertainty in the Right Ascension, in seconds of time.
The rms uncertainty in the Declination, in arcseconds.
The 4.85-GHz peak flux density, in mJy.
The rms uncertainty in the 4.85-GHz peak flux density, in mJy.
A flag parameter which is set to "B" to indicate that the source is near the border of an image. The GB6 Catalog is the result of merging 288 catalogs, each of which came from a single GB6 image covering about 15 X 15 deg of sky. Sources found near the border of an image are flagged "B". The borders of these images overlap, so duplication among sources which appeared in two or more catalogs had to be removed from the final GB6 Catalog. Normally, the one fit without the 'B' flag was chosen. Thus, there are two classes of 'B' sources which remain in the final catalog: (1) All sources near the upper (+75 deg) and lower (0 deg) declination limits of the images, and (2) Sources elsewhere that are just at the catalog limit, so the fit was just above the limit near the border of one image and just below the limit in the overlapping image(s).
A flag parameter which is set to "E" to indicate that there is either significant extension to the source, or that it is a partially resolved blend of two or more point sources.
A flag parameter which is set to "W" to indicate a warning for a weak source with large zero offset |Z|, narrow fitted minor axis < 0.60 * the minor axis of the beam size, or very bad confusion, less reliable than most.
A flag parameter which is set to "C" to indicate that this is a confused source near a stronger source or its sidelobes.
The dimensionless angular size of the radio source, given as the normalized FWHM major axis in units of the beam size major axis (the major diameter of the point source response).
The dimensionless angular size of the radio source, given as the normalized FWHM minor axis in units of the beam size minor axis (the minor diameter of the point source response).
The fitted major axis position angle, in degrees east of north.
The local zero level Z, in mJy/beam.
The map pixel column number of the radio source, measured from the left.
The map pixel row number of the radio source, measured from the bottom.