MWACS - Murchison Widefield Array Commissioning Survey Compact Low-Frequency Source Ctlg

Overview

The Murchison Widefield Array Commissioning Survey (MWACS) is a ~6100 deg² 104 - 196 MHz radio sky survey performed with the Murchison Widefield Array during instrument commissioning between 2012 September and 2012 December. The data were taken as meridian drift scans with two different 32-antenna sub-arrays that were available during the commissioning period. The data were combined in the visibility plane before being imaged, and then mosaicked. The survey covers approximately 20.5^h < RA < 8.5^h, -58^o < Dec < -14^o over three frequency bands centred on 119, 150 and 180 MHz. The survey has 3-arcminute angular resolution and a typical noise level of 40 mJy/beam, with reduced sensitivity near the field boundaries and bright sources. The catalog consists of flux density and spectral index measurements for 14,110 sources, extracted from the mosaics, 1,247 of which are sub-components of complexes of sources.

Catalog Bibcode

2014PASA...31...45H

References

The Murchison Widefield Array Commissioning Survey - MWACS.
    Hurley-Walker N., Morgan J., Wayth R.B., Hancock P.J., Bell M.E.,
    Bernardi G., Bhat N.D.R., Briggs F., Deshpande A.A., Ewall-Wice A.,
    Feng L., Hazelton B.J., Hindson L., Jacobs D.C., Kaplan D.L.,
    Kudryavtseva N., Lenc E., McKinley B., Mitchell D., Pindor B., Procopio P.,
    Oberoi D., Offringa A., Ord S., Riding J., Bowman J.D., Cappallo R.,
    Corey B., Emrich D., Gaensler B.M., Goeke R., Greenhill L., Hewitt J.,
    Johnston-Hollitt M., Kasper J., Kratzenberg E., Lonsdale C., Lynch M.,
    McWhirter R., Morales M.F., Morgan E., Prabu T., Rogers A., Roshi A.,
    Shankar U., Srivani K., Subrahmanyan R., Tingay S., Waterson M., Webster R.,
    Whitney A., Williams A., Williams C.
   <Publ. Astron. Soc. Australia , 31, 45 (2014)>
   =2014PASA...31...45H

Provenance

This table was created by the HEASARC in December 2014 based on CDS catalog VIII/98 file mwacs.dat.

Parameters

Name
The MWACS radio source designation registered with the CDS Dictionary of Nomenclature of Celestial Object, viz., 'MWACS JHHMM.m+DDMM'.

RA
The Right Ascension of the radio source in the selected equinox. This was given in J2000 decimal degrees in the original table.

RA_Error
The rms uncertainty in the Right Ascension of the radio source, in arcseconds (converted by the HEASARC from the arcminute units used in the original table).

Dec
The Declination of the radio source in the selected equinox. This was given in J2000 decimal degrees in the original table.

Dec_Error
The rms uncertainty in the Declination of the radio source, in arcseconds (converted by the HEASARC from the arcminute units used in the original table).

LII
The Galactic Longitude of the radio source.

BII
The Galactic Latitude of the radio source.

Flux_180_MHz
The fitted integrated flux density of the radio source at 180 MHz, in mJy (converted by the HEASARC from the Jy units used in the original table).

Flux_180_MHz_Error
The rms uncertainty in the fitted integrated flux density of the radio source at 180 MHz, in mJy (converted by the HEASARC from the Jy units used in the original table).

Spectral_Index
The fitted spectral index, alpha, of the radio source over the 3 observed frequency bands (centered at 119.04, 149.76 and 180.48 MHz, respectively), where S_nu ~ nu^alpha.

Spectral_Index_Error
The uncertainty in the fitted spectral index, alpha, of the radio source.

Major_Axis
The fitted major axis of the radio source at 180 MHz, in arcminutes, including the convolution with the synthesized beam.

Major_Axis_Error
The uncertainty in the fitted major axis of the radio source at 180 MHz. in arcminutes.

Minor_Axis
The fitted minor axis of the radio source at 180 MHz, in arcminutes, including the convolution with the synthesized beam.

Minor_Axis_Error
The uncertainty in the fitted minor axis of the radio source at 180 MHz. in arcminutes.

Position_Angle
The fitted position angle of the major axis of the radio source at 180 MHz, in degrees, including the convolution with the synthesized beam.

Position_Angle_Error
The uncertainty in the fitted position angle of the major axis of the radio source at 180 MHz, in degrees.

Beam_Major_Axis
The major axis of the beam PSF at 180 MHz at the position of the radio source, in arcminutes.

Beam_Minor_Axis
The minor axis of the beam PSF at 180 MHz at the position of the radio source, in arcminutes.

Beam_Position_Angle
The position angle of the beam PSF at 180 MHz at the position of the radio source, in degrees.

C102_ID
The identification of the radio source within the northern (Dec = -27^o) field. Sources in the overlap region are idenified by having non-null values of both c102_id and c103_id.

C103_ID
The identification of the radio source within the southern (Dec = -47^o) field. Sources in the overlap region are idenified by having non-null values of both c102_id and c103_id.

Multi_Cpt_ID
The sub-component index for those sources which have multi-component fits. All components of a multi-component source will share a value for the c102_id and c103_id parameters, with each source component having a unique value of the mult_cpt_id parameter.

Fit_Type_Code
The type of spectral fit used to determine the radio source spectral index:

     0 = gaussian fit at all frequencies
     1 = flood-fill
     2 = forced measurement

Contact Person

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

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:31:18 EDT