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VIII/17 31524 1.4-GHz Sources (White and Becker 1992)
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The 1.4-GHz Northern Sky Catalog
White R.L., Becker R.H.
<ApJS, 79, 331 (1992)>
=1992ApJS...79..331W
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ADC_Keywords: Radio sources
Description:
This catalog contains a list of 30239 1.4 GHz radio sources over the
declination range of -5 degrees to 82 degrees. This catalog is based
on the Green Bank 1.4 GHz Northern Sky Survey (Condon and Broderick
1985, 1986), which was generated using the Green Bank 300 foot (91m)
telescope. The threshold for identifying a 1.4 GHz radio source was
set at 100 mJy. The catalog data include the source name, a confusion
flag, right ascension (1950), declination (1950), 1.4 GHz flux, a flag
to indicate if the source is extended at 20 cm, 4.85 GHz flux (from
Becker et al. 1991), a flag to indicate if the source is extended at
6 cm, 0.365 GHz flux (from Douglas et al. 1980), spectral index between
6 and 20 cm, and spectral index between 20 and 80 cm. Where
possible, the source name is derived from the 6 cm catalog of Becker
et al. 1991.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
north20.dat 69 31524 Catalog Data
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Byte-by-byte Description of file: north20.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- NAME *20cm Name
12 A1 --- CONFLG *flag
14- 15 I2 h RAh Hours of right ascension (1950)
17- 18 I2 min RAm Minutes of RA
20- 23 F4.1 s RAs Seconds of RA
25 A1 --- DE- Sign of declination
26- 27 I2 deg DEd Degrees of declination
29- 30 I2 arcmin DEm Minutes of declination
32- 33 I2 arcsec DEs Seconds of declination
35- 41 I7 mJy FLUX 1.4 GHz flux
42 A1 --- EXTFLG "*" if source is extended at 20cm, else blank
44- 50 I7 mJy CFLUX ? 4.85 GHz flux from Becker et al (1991)
51 A1 --- CEXTFLG "*" if source is extended at 6cm, else blank
53- 59 I7 mJy PFLUX ? 0.365 GHz flux from Texas survey,
Douglas et al., private comm.
61- 64 F4.1 --- SpHI ? Spectral index between 6 and 20 cm; blank
if not detected at 6 cm.
F(nu) = C*nu**alpha.
66- 69 F4.1 --- SpLO ? Spectral index between 20 and 80 cm; blank
if not detected at 80cm
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Note on NAME:
20 cm 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, Ap J Supp 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).
Note on CONFLG:
? 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.
Remarks:
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., in press). 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.
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
References:
Becker, R.H., White, R.L. and Edwards, A.L. 1991, ApJS, 75, 1
Condon, J.J., and Broderick, J.J. 1986, AJ, 91, 1051
Douglas, J.N., Bash, F.N., Torrence, G.W., and Wolfe, C. 1980,
Univ. Tex., Publ. Astron., No. 17
Condon. J.J., and Broderick, J.J. 1985, AJ, 90, 2540
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(End) C.-H. Joseph Lyu [Hughes STX/NASA] 01-Aug-1995