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MGPS2 - Molonglo Galactic Plane Survey 2nd Epoch Compact Source Catalog

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Overview

This table contains the Molonglo Galactic Plane Survey 2nd Epoch (MGPS-2) Compact Source Catalog. The MGPS-2 was carried out with the Molonglo Observatory Synthesis Telescope (MOST) at a frequency of 843 MHz and with a restoring beam of 45" x 45" cosec |(delta)|, where delta is the declination, making it the highest resolution large-scale radio survey of the southern Galactic plane to date. It covers the range |b| < 10 degrees and 245 < l < 365 degrees, where l and b are the Galactic longitude and latitude, and is the Galactic counterpart to the SUMSS (CDS Cat. VIII/81) Catalog which covers that portion of the southern sky with delta < -30 degrees, |b| > 10 degrees.

This version of the catalog (15-Aug-2007) consists of 48850 compact sources, made by fitting elliptical gaussians in the MGPS-2 mosaics to a limiting peak brightness of 10 mJy/beam. The authors used a custom method (described in the associated reference publication) to remove extended sources from the catalog. Positions in the catalog are accurate to 1" - 2". The authors have carried out an analysis of the compact source density across the Galactic plane and find that the source density is not statistically higher than the density expected from the extragalactic source density alone.

See http://www.astrop.physics.usyd.edu.au/mosaics for access to the MGPS-2 mosaic images.


Catalog Bibcode

2007MNRAS.382..382M

References

The Molonglo Galactic Plane Survey (MGPS-2): Compact Source Catalogue
    Murphy, T., Mauch, T., Green, A., Hunstead, R. W., Piestrzynski, B.,
    Kels, A.P., Sztajer, P.
    2007, MNRAS, Volume 382, p. 382
   (2007MNRAS.382..382M)

Provenance

This HEASARC table was created in January 2008 based on CDS catalog J/MNRAS/382/382 file mgpscat.dat.

Parameters

Name
The MGPS-2 source designation (MGPS JHHMMSS-DDMMSS) provided by the authors, using the IAU-recommended position-based method.

RA
The Right Ascension of the radio source in the selected equinox. This was given in J2000 coordinates to a precision of 0.01 seconds of time in the original table.

Dec
The Declination of the radio source in the selected equinox. This was given in J2000 coordinates to a precision of 0.1 arcseconds in the original table.

LII
The Galactic Longitude of the radio source.

BII
The Galactic Latitude of the radio source.

RA_Error
The uncertainty in the Right Ascension of the radio source, in arcseconds, calculated from the quadratic sum of the MOST Right Ascension calibration uncertainty and equation (1) of the reference paper.

Dec_Error
The uncertainty in the Declination of the radio source, in arcseconds, calculated from the quadratic sum of the MOST Declination calibration uncertainty and equation (2) of the reference paper.

Flux_36_cm
The 843 MHz (36 cm) peak brightness of the source, in units of mJy/beam, calculated as described in Section 5.3 of the reference paper.

Flux_36_cm_Error
The 1-sigma uncertainty in the radio source peak brightness at 843 MHz, in mJy/beam, calculated as described in Section 5.3 of the reference paper.

Int_Flux_36_cm
The total flux density of the radio source at 843 MHz, in mJy.

Int_Flux_36_cm_Error
The uncertainty in the total flux density of the radio source at 843 MHz, in mJy, calculated from the equations described by Condon (1997, PASP, 109, 166).

Fit_Major_Axis
The fitted size of the major axis of the radio source, in arcseconds.

Fit_Minor_Axis
The fitted size of the minor axis of the radio source, in arcseconds.

Fit_Position_Angle
The fitted major axis position angle of the radio source, in degrees east of north. Most unresolved sources would have PA values close to 0 or 180 degrees, since the MOST elliptical beam has a position angle PA = 0 degrees.

Major_Axis
The major axis of the source after deconvolution from the MOST beam, in arcseconds. This parameter is given if the fitted major axis size exceeds the beam size by more than 2.33 times the sigma of the fitted major axis size.

Minor_Axis
The minor axis of the source after deconvolution from the MOST beam, in arcseconds. If the major axis is resolved, the minor axis is subsequently checked using the same criterion, viz., this parameter is filled if the fitted minor axis size exceeds the beam size by more than 2.33 times the sigma of the fitted minor axis size, and the deconvolved size is given.

Position_Angle
The deconvolved position angle of the source, in degrees east from north. This parameter is given if the major axis is resolved.

Mosaic_Name
The name of the mosaic in which the radio source appears. The naming scheme for MGPS-2 mosaics is JHHMMMDD indicating the J2000 RA and Dec of the mosaic centre, e.g., J0712M32. The original mosaics are available online at http://www.astrop.physics.usyd.edu.au/mosaics. In the case where a radio source appears in two mosaics (due to overlap), the mosaic name quoted is the one for which the fitted parameters are included in the catalog.

Number_Mosaics
The number of mosaics in which the source appears. Sometimes a source can appear in multiple mosaics because of a small overlap region used to ensure all sources are properly imaged and not truncated. The source parameters which appear in the catalog are those for the most reliable fit.

X_Pixel
The x-pixel position of the radio source in the quoted mosaic.

Y_Pixel
The y-pixel position of the radio source in the quoted mosaic.


Contact Person

Questions regarding the MGPS2 database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 30-Jan-2008