ADC/CDS Standard Document for Catalog:/catalogs/8/8016/
ADC/CDS Standard Document for Catalog:| 1. Use the ADC Data Viewer Suite to visualize the data. |
|
| 2. Get the data files via anonymous FTP. (See Note.) |
|
VIII/16 Molonglo Reference Catalogue of Radio Sources (Large+ 1991)
================================================================================
Molonglo Reference Catalogue of Radio Sources
Large M.I., Cram L.E., Brugess A.M.
<The Observatory, 111, 72 (1991)>
=1991Obs...111...72L
================================================================================
ADC_Keywords: Radio sources
Description:
" 408-MHz survey observations made with the Molonglo Radio Telescope
have been used to prepare a catalogue of 12 141 discrete sources of
listed flux density >= 0.7 Jy. The survey covers 7.85 sr of the sky
defined by +18.5 (deg) >= dec(1950) >= -85.0 (deg), mod(b) >= 3
(deg). A few sources beyond the declination limits are also
included. The catalogue comprises celestial coordinates with
standard error typically lying between 3 and 10 arcsec and 408-MHz
flux densities with standard error typically lying between 4 and 10
per cent. Galactic coordinates, notes on source morphology and
cross-references to the Parkes Catalogues are included. The overall
source density is 1500/sr, corresponding to 0.001 per beam area.
There are 7347 sources of listed flux density >= 1.00 Jy, at which
level the catalogue is substantially complete. The reliability is
believed to be better than 99.9 per cent. " The MRC was re-issued in
1990 with the original B1950 coordinates supplemented by J2000
values, and an additional cross-reference flag `J' added to denote
(extended) sources imaged at 843-MHz by P.A. Jones. No other
alterations were made to the original release. The MRC is now
available on 5.25 inch, 1.2 Mbyte MS-DOS (IBM) floppy disk (0.5 inch
magnetic tape is also available, but is not the preferred medium).
In the floppy disk format, simple software is provided to facilitate
use of the catalogue on a PC computer.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
mrcj2000.dat 87 12141 Catalog Data
mrc.for 76 724 fortran code to read catalog by L. Cram (1990)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: mrcj2000.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Bname *Recommended IAU name of the source based on
B1950 equinox.
11- 12 I2 h RAh Right ascension (hours) in B1950 equinox
14- 15 I2 min RAm RA (minutes) in B1950 equinox
17- 20 F4.1 s RAs RA (sec) in B1950 equinox
22 A1 --- DE- Declination sign
23- 24 I2 deg DEd DEC in degrees in B1950 equinox
26- 27 I2 arcmin DEm DEC in arcminutes in B1950 equinox
29- 30 I2 arcsec DEs DEC in arcseconds in B1950 equinox
32- 33 I2 h RAh2000 Right ascension (hours) in J2000 equinox
(Converted from B1950 using the STARLINK
program COCO)
35- 36 I2 min RAm2000 RA (minutes) in J2000 equinox
38- 41 F4.1 s RAs2000 RA (seconds) in J2000 equinox
43 A1 --- DE-2000 Declination sign
44- 45 I2 deg DEd2000 DEC in J2000 equinox
47- 48 I2 arcmin DEm2000 DEC in J2000 equinox
50- 51 I2 arcsec DEs2000 DEC in J2000 equinox
52- 54 F3.1 s e_RAs2000 Standard error in RA (in seconds of time)
55 A1 --- flag1 '*' indicates that the values obtained from
two or more independent transits are
scattered more than expected.
56- 57 I2 arcsec e_DEs2000 Standard error in Dec (in seconds of arc)
58 A1 --- flag2 See flag1
59- 65 F7.2 Jy Flux Flux density
66- 69 F4.2 Jy e_Flux Standard error
70 A1 --- flag3 See flag1
71- 73 A3 --- Mflag *Morphology flags
74 A1 --- Cflag1 Cross-reference flag1
J - See Jones (1989)
75- 76 A2 --- Cflag2 *Cross-reference flag2
77- 81 F5.1 deg GLON [0,360] Galactic longitude
82- 87 F6.1 deg GLAT Galactic latitude
--------------------------------------------------------------------------------
Note on Bname:
The first four characters are the hours and minutes of right ascension, and
the last four the signed declination in tenths of a degree (unrounded).
Column 9 contains the letters A, B, etc. denoting sources having the same
eight-character IAU designation but decreasing flux density.
Note on Mflag:
Morphology flags
blank - no clear evidence of departure from point
A - Source with small-scale structure
E - Extended source
C - Complex extended source
M - Multiple sources (within 8 arcmin of another)
N - Weak neighbouring sources
Note on Cflag2:
Cross-reference flag2
P - Source lies within 2 arcmin of a Parkes source
T - Discussed in the original MNRAS MRC paper
S - See Schilizzi and McAdam (1975)
M - See Clarke et al. (1976)
C - See Cameron (1971)
R - See Robertson (1973)
Two flags at most are used in Cols 75-76, with P>T>S>M>C>R.
Remarks:
DATA STRUCTURE.
The machine-readable MRC is provided as 12 141 ASCII records, each
of fixed length 87 bytes (each followed by CR,LF). The first line is
listed below, with `x' in positions that may be occupied by characters
but are blank in the first record :
===========================================================================
1 10 20 30 40 50
| | | | | |
0000-506x 00 00 09.2 -50 41 31 00 02 42.5 -50 24 49x.3xx4xx
60 70 80
| | |
xx1.28x.06xxxxxpx-64.9 321.4
===========================================================================
FORTRAN CODE TO READ MRC
FORTRAN 77 source is included (MRC.FOR) to allow menu-driven reading of
the MRC as provided here. The FORTRAN program is self-explanatory. It
expects to find the MRC ASCII data file in the current directory and with
the name MRCJ2000. An executable version of this FORTRAN code has been
produced (using Microsoft FORTRAN Version 5, with a library which uses a
co-processor should one be available) and may be invoked on an IBM AT or
compatible by setting the correct current directory and typing `MRC'. The
program will run faster if the source and data are placed on a hard disk.
The original MRC was published in Mon. Not. R. astr. Soc., Vol 194,
pp 693-704 and Microfiches MN 194/1.
================================================================================
(End) C.-H. Joseph Lyu [Hughes STX/NASA] 01-Aug-1995