VIII/14 87GB Catalog of radio sources (Gregory et al., 1991)
The 87GB Catalog of Radio Sources covering 0 to +75° at 4.85 GHz
Gregory P.C., Condon J.J.
<Astrophys. J. Suppl. Ser. 75, 1011-1291 (1991)>
=1991ApJS...75.1011G 1991ApJS...75.1011G
ADC_Keywords: Radio sources
Abstract of paper:
The 91m telescope in Green Blank was used during 1987 October to map
6.0sr of the sky in the [0,+75]degrees declination band at 4.85GHz. We
present the 87GB catalog of 54579 discrete sources with angular sizes
less than about 10.5arcmin and stronger than S about 25mJy derived
from these maps. The catalog positions and flux densities have been
corrected for known map biases. Their estimated rms uncertainties were
verified by comparison with more accurate positions and flux densities
available for some sources. The 4.85GHz normalized source counts
S5/2.n(S) between 25mJy and 10Jy were obtained and agree well with
evolutionary models based on independent data.
File Summary:
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File Name Lrecl Records Explanations
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ReadMe 80 . This file
makefile 80 46 Unix Makefile to generate the programs
b1950.dat 80 54579 The 87GB catalogue in B1950 coordinates
j2000.dat 80 54579 The 87GB catalogue in J2000 coordinates
SIMPLE.fih 73 24 Original FITS header
b1950.fih 67 127 Original FITS extension header for b1950.dat
f2000.fih 67 127 Original FITS extension header for j2000.dat
match.f 77 293 Selection program
match.for 77 285 Selection program
readme.txt 80 278 87GB Catalog Description
select.f 73 249 Selection program
select.for 73 248 Selection program
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See also:
VIII/40 : The GB6 catalog of radio sources (Gregory et al., 1996)
which contains 75,162 sources with flux densities S≥18mJy.
Description:
The 54579 sources of the 87GB catalogue are stored in two files,
with B1950 coordinates (b1950.dat) and J2000 coordinates (j2000.dat).
On Unix workstations, a simple fold
command can be used to transform the FITS files into plain ascii
files with format:
Byte-by-byte Description of file: *.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension (hours) (B1950 or J2000)
3- 4 I2 min RAm Right Ascension (minutes) (B1950 or J2000)
5- 8 F4.1 s RAs Right Ascension (seconds) (B1950 or J2000)
10- 12 F3.1 s e_RAs rms uncertainty in RA (seconds)
14 A1 --- DE- Declination (sign) (B1950 or J2000)
15- 16 I2 deg DEd Declination (degrees) (B1950 or J2000)
17- 18 I2 arcmin DEm Declination (minutes) (B1950 or J2000)
19- 20 I2 arcsec DEs Declination (seconds) (B1950 or J2000)
22- 23 I2 arcsec e_DEs rms uncertainty in Declination
25- 29 F5.1 deg GLAT galactic latitude b2
31- 35 F5.1 deg GLON [0/360] galactic longitude l2
37- 41 I5 mJy Flux 4.85 GHz peak flux density
43- 46 I4 mJy e_Flux rms uncertainty in FLUX
49 A1 --- Eflag [E] flag for extended source
50 A1 --- Wflag [W] warning flag
51 A1 --- Cflag [C] flag for confused source
53- 56 F4.2 --- MajAxis normalized major axis of fit
58- 61 F4.2 --- MinAxis normalized minor axis of fit
63- 65 I3 deg Angle fit major-axis PA (degrees E of N)
67- 69 I3 mJy Zero zero-level of fit
71- 74 I4 --- PIXX x-coordinate pixel number
76- 79 I4 --- PIXY y-coordinate pixel number
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Programs:
Issuing on Unix workstations the command
make
in this directory should normally be enough to generate the
search programs and their related data files (these programs
use plain ascii files B1950.xxH and J2000.xxH with the above format,
where xx stands for the hour of right ascension from 00 to 23).
Historical Notes:
*30-Nov-1992: First archived at CDS
*04-Oct-1994: The FITS files have been converted to standard ascii files.
(End) Francois Ochsenbein [CDS] 30-Nov-1992