CGPSNGPCAT - Canadian Galactic Plane Survey (CGPS) 1420-MHz Compact Source Catalog

Overview

This table contains a catalog of compact sources of radio emission at 1420 MHz in the northern Galactic plane from the Canadian Galactic Plane Survey (CGPS). The catalog contains 72,758 compact sources with an angular size less than 3 arcminutes within the Galactic longitude range 52 < l_II < 192 degrees down to a 5-sigma detection level of ~1.2 mJy. Linear polarization properties are included for 12,368 sources with signals greater than 4 x sigma_QU in the CGPS Stokes Q and U images at the position of the total intensity peak. In the reference paper, the authors compare the CGPS flux densities with the catalogued flux densities in the Northern VLA Sky Survey (NVSS) catalog for 10,897 isolated unresolved sources with CGPS flux density greater than 4 mJy in order to search for sources that show variable flux density on timescales of several years. They identify 146 candidate variables that exhibit high fractional variations between the two surveys. In addition, they identify 13 candidate transient sources that have CGPS flux density above 10 mJy but that are not detected in the NVSS.

In the CGPS, the Synthesis Telescope at the Dominion Radio Astrophysical Observatory (the DRAO ST) provided arcminute-resolution images of the radio continuum and atomic-hydrogen line emission of the northern Galactic Plane. The CGPS DRAO radio continuum observations provided images of Stokes I, Q, and U in four 7.5-MHz sub-bands spanning 35 MHz, centered on 1420 MHz. The observations were carried out in three phases beginning in 1995 and ending in 2009. The sky coverage of each phase and the observing dates are listed in Table 1 of the reference paper. The Galactic plane was covered with a width in Galactic latitude of 9 degrees, centered at b_II = 1 degree to accommodate the warp of the Galactic disk. The longitude coverage was constrained by the southern Declination limit of ~20 degrees, the range that could be effectively imaged by a linear east-west synthesis telescope array. The Phase II observations included an extension to higher latitudes (b_II = 17.5 degrees) over a restricted range of longitude.

In this table, we present the CGPS 1420-MHz compact source catalog covering 1,464 square degrees and spanning a range of 140 degrees of Galactic longitude between 52 and 192 degrees.

Catalog Bibcode

2017AJ....153..113T

References

A 1420 MHz Catalog of Compact Sources in the Northern Galactic Plane
     Taylor A.R., Leahy D.A., Wenwu T., Sunstrum C., Kothes R.,
     Landecker T.L., Ransom R.R., Higgs L.A.
    <Astron. J., 153, 113 <2017>
    =2017AJ....153..113T   (SIMBAD/NED Bibcode)

Provenance

This table was created by the HEASARC in June 2017 based upon a machine-readable version of Table 2 from the reference paper that was obtained from the AJ web site.

Parameters

Name
The Canadian Galactic Plane Survey (CGPS) compact source designation based on its J2000.0 position, viz., 'CGPS JHHMMSS+DDMMSS'.

RA
The Right Ascension of the CGPS compact source in the selected equinox. This was given in decimal degrees to a precision of 10^-5 degrees in the original table.

RA_Error
The 1-sigma uncertainty in the Right Ascension of the CGPS compact source, in seconds of time.

Dec
The Declination of the CGPS compact source in the selected equinox. This was given in decimal degrees to a precision of 10^-5 degrees in the original table.

Dec_Error
The 1-sigma uncertainty in the Declination of the CGPS compact source, in arcseconds.

LII
The Galactic Longitude of the CGPS compact source.

BII
The Galactic Latitude of the CGPS compact source.

Int_Flux_1420_MHz
The integrated Stokes I intensity of the CGPS compact source at 1420 MHz, in mJy.

Int_Flux_1420_MHz_Error
The 1-sigma uncertainty in the integrated Stokes I intensity of the CGPS compact source at 1420 MHz, in mJy.

Flux_1420_MHz
The peak Stokes I intensity of the CGPS compact source at 1420 MHz, in mJy/beam.

Flux_1420_MHz_Error
The 1-sigma uncertainty in the peak Stokes I intensity of the CGPS compact source at 1420 MHz, in mJy/beam.

RMS_1420_MHz
The average rms around the position of the 1420-MHz compact source in the Q and U images, in mJy.

Pol_Flux_1420_MHz
The bias-corrected polarized intensity of the 1420-MHz compact source, in the case of detected polarized emission, in mJy/beam.

Pol_Flux_1420_MHz_Error
The 1-sigma uncertainty in the bias-corrected polarized intensity of the 1420-MHz compact source, in mJy/beam.

Pol_Angle_1420_MHz
The polarization position angle of the 1420-MHz compact source, in degrees

Major_Axis
The deconvolved major axis of the Stokes I emission of the 1420-MHz compact source, in arcseconds. The deconvolved source dimensions are listed as zero if the source is classed as unresolved. The beam dimensions at the location of the source can be calculated using Equation (1) of the reference paper.

Major_Axis_Error
The 1-sigma uncertainty in the deconvolved major axis of the Stokes I emission of the 1420-MHz compact source, in arcseconds.

Minor_Axis
The deconvolved minor axis of the Stokes I emission of the 1420-MHz compact source, in arcseconds. The deconvolved source dimensions are listed as zero if the source is classed as unresolved. The beam dimensions at the location of the source can be calculated using Equation (1) of the reference paper.

Minor_Axis_Error
The 1-sigma uncertainty in the deconvolved minor axis of the Stokes I emission of the 1420-MHz compact source, in arcseconds.

Position_Angle
The deconvolved major-axis position angle of the source, measured with respect to J2000.0 north, in degrees.

Contact Person

Questions regarding the CGPSNGPCAT database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:25:32 EDT