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Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt........23t&link_type=abstract
Thesis (PH.D.)--THE UNIVERSITY OF BRITISH COLUMBIA (CANADA), 1982.Source: Dissertation Abstracts International, Volume: 43-12,
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1
Scientific paper
Observations have been carried out to survey the northern galactic plane for sources of highly variable radio emission at 5 GHz. To over-come the biases of previous searches for variability, the survey is conducted by making repeated and systematic observations of the survey regions, consisting of the area within about (+OR-)2(DEGREES) of the galactic plane in the longitude interval of 40(DEGREES) to 220(DEGREES). This thesis presents the analysis and results of the first 40% of the survey. The observations were carried out for a total of 3 months, and cover an area of over 200 square degrees, with a resolution of 3'. Within this area, 806 compact radio sources have been detected. The catalogue includes sources with flux density as low as 15 mJy, and is complete down to 70 mJy. Of these sources, 758 have been examined for variation on a time scale of a few days (short-term), and 434 for variations on time scales of one or two years (long-term). Twenty-three new variable sources have been discovered; 12 short-term and 11 long-term. An additional 18 sources are possibly variable. The amplitudes of the long-term variations are similar to those of known extragalactic variables. A number of short-term variables exhibit much larger variations. The longitude distribution suggest that the majority of short-term variables are galactic, with luminosities in the range 10('30) - 10('35) ergs-s(' -1); similar to the luminosities of the strong X-ray binary sources, such as Cyg X-3, SS 433 and Sco X-1. Extensive follow-up observations have been carried out for only one of the variable sources discovered. This source (GT0236 + 610) is periodic, undergoing a radio outburst every 26.52 days. The source is co-incident with the B0 star LS I + 61(DEGREES)303. The identification has been confirmed by Gregory et al. (1979). GT0236 + 610 is an X-ray source (Share et al. 1978, Bignami et al. 1980) and is the most probable counterpart of the COS B (gamma) -ray source CG135 + 01 (Gregory and Taylor 1978). Another highly variable source (GT2116 + 493) is also found to be co-incident with a stellar object. This source is probably an RS CVn type binary at a distance of about 300 pc. Comparison of source counts from the catalogue, to extragalactic results, show that > 200 of the compact sources, with flux density < 60 mJy, are galactic. The non-variable galactic sources are likely small HII regions within 6 kpc of the sun.
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