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THE 1.4 GHZ NORTHERN SKY CATALOG Distribution version, 4 December 1991 This is a brief description of the format of the distribution version of the 20 cm Northern Sky Catalog of White, R. L. and Becker, R. H. (1992, Ap.J.Supp., 79, 331). For more details see the paper. The catalog is in an ascii file with 69 characters per record. It can be read with the following Fortran statements: character name*10, conflg, decsgn*1, extflg, cextflg integer rahh, ramm, decdd, decmm, decss, flux, cflux, pflux real rass, sihi, silo read(10,1) name, conflg, rahh, ramm, rass, & decsgn, decdd, decmm, decss, & flux, extflg, cflux, cextflg, pflux, sihi, silo 1 format(a10, 1x, a1, 1x, i2, 1x, i2, 1x, f4.1, 1x, & a1, i2, 1x, i2, 1x, i2, 1x, & i7, a1, 1x, i7, a1, 1x, i7, 1x, f4.1, 1x, f4.1) Note that several of the columns may be blank, so in an actual application one would have to be careful about zero values for a number of items. Column Variable Format Description ------ -------- ------ ----------- (1) NAME A10 20cm Name, constructed from RA, Dec HHMM+DDMM with A or B added at end if needed to make name unique. When a 20cm source matches a sources in the 6cm catalog of Becker, White, & Edwards (1991, ApJSupp 75, 1) the 6cm name and position (good to 40" at the 90% confidence level) are used. Sources without a 6cm counterpart have names ending in L; their positions are only accurate to 160" at the 90% confidence level). (2) CONFLG A1 A ? indicates that a 20cm source matched more than one 6cm or 80cm source, so confusion is likely. In that case the additional matches are listed in following lines. (3) RAHH I2 Hours of right ascension (1950) (4) RAMM I2 Minutes of RA (5) RASS F4.1 Seconds of RA (6) DECSGN I2 Sign of declination (7) DECDD I2 Degrees of declination (8) DECMM I2 Minutes of declination (9) DECSS I2 Seconds of declination (10) FLUX I7 1.4 GHz flux (mJy) (11) EXTFLG A1 "*" if source is extended at 20cm, else blank (12) CFLUX I7 4.85 GHz flux (mJy) from Becker et al (1991) (13) CEXTFLG A1 "*" if source is extended at 6cm, else blank (14) PFLUX I7 0.365 GHz flux (mJy) from Texas survey, Douglas et al., private comm. (15) SIHI F4.1 Spectral index between 6 and 20 cm; blank if not detected at 6 cm. F(nu) = C nu**alpha. (16) SILO F4.1 Spectral index between 20 and 80 cm; blank if not detected at 80cm Here are a few sample lines from the catalog: 123456789 123456789 123456789 123456789 123456789 123456789 123456789 0000-0041 00 00 24.0 -00 41 17 167 139 432 -0.1 -0.7 0000+6849L 00 00 26.4 +68 49 39 721* 0000+1821 00 00 27.9 +18 21 39 123 177 299 0.3 -0.7 0000+5457 ? 00 00 28.6 +54 57 33 140 45 351 -0.9 -0.7 2359+5453 ? 23 59 25.3 +54 53 57 140 128 -0.1 0000+4600 00 00 31.6 +46 00 06 123 27 181 -1.2 -0.3 0000+5814 00 00 31.9 +58 14 56 329 104 1137 -0.9 -0.9