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DIXON - Dixon Master List of Radio Sources (Version 43)

HEASARC
Archive

Overview

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.

Catalog Bibcode

1970ApJS...20....1D

References

A Master List of Radio Sources
     Dixon R.S.
    <Astrophys. J. Suppl. Ser. 20, 1 (1970)>

Provenance

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.

Parameters

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.


Contact Person

Questions regarding the DIXON database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 2-Nov-2005