A 408-MHz radio survey of the region surrounding Simeis 57

Details A 408-MHz radio survey of the region surrounding Simeis 57 A 408-MHz radio survey of the region surrounding Simeis 57

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jrasc..85...24h&link_type=abstract

Journal of the Royal Astronomical Society of Canada (ISSN 0035-872X), vol. 85, Feb. 1991, p. 24-42.

Astronomy and Astrophysics

Astronomy

6

H Ii Regions, Radio Astronomy, Radio Sources (Astronomy), Sky Surveys (Astronomy), Astronomical Maps, Cygnus Constellation, Emission Spectra, Spectrum Analysis, Synthetic Apertures

Scientific paper

In late 1985, the area surrounding the peculiar H II region Simeis 57 was observed with the DRAO Synthesis Telescope at 408 MHz. Despite the presence of Cygnus A in the field of view, which limits the sensitivity of the telescope owing to its limited dynamic range, a reasonable picture of the distribution of stronger radio sources in this region has been obtained. Included in the 8 deg field of view are the SNR W 63 and the north-east portion of the Cygnus X complex of H II regions. Some 40 compact radio sources are catalogued and the extended sources are discussed. A spectral index is derived for the radio emission from Simeis 57 but it is not sufficiently precise to determine whether or not the emission is thermal. Spectral indices of many of the compact sources have been derived from the data in the literature, combined with the present results. Most sources are extragalactic, but several possible Galactic sources are identified. Two of these may be small-diameter SNRs.

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