This database table is the Dixon Master List of Radio Sources (Version 43,
dated November 1981) which contains flux densities for known radio sources
detected at a variety of frequencies. The Master List of Radio Sources was
prepared by combining about thirty catalogs of radio sources that were
available as of that date into a common format. Notice that this is a
list of observations, not of individual sources, and that an entry
in this table corresponds to an observation of a radio source at a
particular frequency from a particular source catalog: also, no attempt
was made by the author to use the same name for the same source, e.g.,
the source 3C 273 appears more than a dozen times under a variety of names
such as PKS 1226+02, NRAO400, CTA 53, etc.
1970ApJS...20....1D
A Master List of Radio Sources
Dixon R.S.
<Astrophys. J. Suppl. Ser. 20, 1 (1970)>
This database table was recreated at the HEASARC in June 2005 after it was
discovered that the positions had been incorrectly precessed. The original
input table used for both the previous and current HEASARC Dixon tables was
the 43rd version of the Master List, dated November 1981. It was
obtained from the Colorado node of the Astrophysics Data System (ADS), the
now-defunct HTTP link <adswww.colorado.edu/catalogs/rad_msl43.html>, and
apparently was provided by D. E. Harris on or after 1991. Notice that the
version of this table that is currently available at CDS
(ftp://cdsarc.u-strasbg.fr/pub/cats/VII/2A) is, according to Andernach
(1989, Bull. Inf. Centre Donnees Stellaires, 37, 139), the 42nd edition
(dated 1976) and has only 79493 entries compared to 84559 entries in
the HEASARC table.
Name
The source designation: NRAO (National Radio Astronomy Observatory),
PP, PKS (Parkes Radio Catalog), LMH, MM, etc.
RA
The Right Ascension of the radio source in the selected equinox.
This was given in B1950 equatorial coordinates to a precision of
10^-7 degrees in the original table, although the real accuracy of
the positions is clearly much less (<= a 1 - a few arcminutes).
Dec
The Declination of the radio source in the selected equinox.
This was given in B1950 equatorial coordinates to a precision of
10^-7 degrees in the original table, although the real accuracy of
the positions is clearly much less (<= a 1 - a few arcminutes).
LII
The galactic longitude of the radio source.
BII
The galactic latitude of the radio source.
Frequency
The frequency (in MHz) at which the radio source was detected
for the given flux density.
Limit_Flux_Radio
This flag indicates whether the flux density is a lower
or upper limit. A '>' symbol indicates that the flux density is greater than
the given value. A '<' symbol is given if the flux density is less than the
given value. If the flux density given is neither an upper nor a lower limit,
this flag is left blank.
Flux_Radio
The flux density (in mJy) at the given frequency of the
radio source. This was converted by the HEASARC from the Jy units
used in the original table.
Questions regarding the DIXON database table can be addressed to the
HEASARC User Hotline.
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Page Author: Browse Software Development Team
Last Modified: Wednesday, 02-Nov-2005 18:11:30 EST