High resolution observations of compact radio sources in the directions of supernova remnants

Details High resolution observations of compact radio sources in the directions of supernova remnants High resolution observations of compact radio sources in the directions of supernova remnants

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mmsai..49..577g&link_type=abstract

(Società Astronomica Italiana and Consiglio Nazionale delle Ricerche, Workshop on Supernovae and Supernova Remnants, 1st, Erice,

Astronomy and Astrophysics

Astronomy

Interstellar Radiation, Radio Astronomy, Radio Sources (Astronomy), Supernova Remnants, Very Long Base Interferometry, Astronomical Spectroscopy, High Resolution, Radio Spectra

Scientific paper

VLBI observations of five compact radio sources located in the directions of supernova remnants (SNRs) are reported which were performed at a wavelength of 2.8 or 3.7 cm with resolutions of the order of 1 milliarcsec. The sources observed (and the SNRs near them) include CL4 (the Cygnus Loop), G127.11 plus 0.54 (G127.1 plus 0.5), G74.84 plus 1.22 (G74.9 plus 1.3), 2052 plus 43 (G84.2-8), and 0016 plus 731 (CTA 1). Fits of simple circular Gaussian models to the limited data indicate that three of the sources (CL 4, 2052 plus 43, and 0016 plus 731) have angular sizes of less than 1 milliarcsec, while the remaining two sources have angular sizes of less than 0.5 milliarcsec. The linear sizes are estimated to range from less than 1 AU to 7 AU. The shapes and variation of the radio spectra of these objects, as well as their angular sizes and brightness temperatures, are shown to be similar to those of Cyg X-3 and the compact source at the galactic center.

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