A Westerbork Synthesis Radio Telescope 327 MHz Survey of the Galactic Plane

Abstract

view Abstract Citations (73) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Westerbork Synthesis Radio Telescope 327 MHz Survey of the Galactic Plane Taylor, A. R. ; Goss, W. M. ; Coleman, P. H. ; van Leeuwen, J. ; Wallace, B. J. Abstract The Westerbork Synthesis Radio Telescope (WSRT) has been used to survey the Galactic plane region 42^deg^ < l < 92^deg^ at a frequency of 327 MHz. We present images of the emission within |b| < 1.6^deg^ at resolution of 1' x 1' csc δ and detection level as low as 10 mJy beam^-1^. Inspection of the survey image has produced a catalog of nearly 4000 discrete sources with sizes less than about ~3'. The catalog of these sources and FITS files of seven images covering the survey area are available on the World Wide Web at http://www.ras.ucalgary.ca/wsrt_survey.html. Approximately 15% of the sources are resolved, with dimensions of 1'- 3'. The spatial distribution of resolved sources shows concentrations toward the spiral arms and follows the warping of the Galactic disk over the length of the survey region, indicating that a sizable fraction is Galactic. Spectral indices are calculated for 1313 sources detected in other radio surveys at frequencies greater than 408 MHz. The resolved sources exhibit a bimodal spectral index distribution, with distinct nonthermal and thermal populations. Comparison with the IRAS Point Source Catalogue results in 118 identifications between WSRT and IRAS sources. Most of these are thermal radio sources associated with compact Galactic objects such as H II regions and planetary nebulae. A search for variability among 2148 of the compact sources has resulted in 29 candidate low-frequency variable sources. Publication: The Astrophysical Journal Supplement Series Pub Date: November 1996 DOI: 10.1086/192363 Bibcode: 1996ApJS..107..239T Keywords: ISM: H II REGIONS; ISM: PLANETARY NEBULAE: GENERAL; RADIO CONTINUUM: GENERAL; SURVEYS full text sources ADS | data products SIMBAD (4051) NED (3530) CDS (2) Related Materials (1) Catalog: 1997yCat..21070239T