Meter-wavelength VLBI. I - Cassiopeia A

Details Meter-wavelength VLBI. I - Cassiopeia A Meter-wavelength VLBI. I - Cassiopeia A

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974aj.....79.1248h&link_type=abstract

Astronomical Journal, vol. 79, Nov. 1974, p. 1248-1252.

Astronomy and Astrophysics

Astronomy

9

Radio Interferometers, Supernova Remnants, Very High Frequencies, Astronomical Maps, Interferometry, Radiant Flux Density, Radio Astronomy, Visibility

Scientific paper

Very-long-baseline interferometric observations of the supernova remnant Cassiopeia A, at 74 MHz with a 12,000-wavelength baseline and at 111 MHz with a 18,500-wavelength baseline, are reported. The fringe amplitudes are strongly varying on a time scale of about 15 to 30 minutes, which is attributed to much the same complex structure as that observed at higher frequencies, plus one other compact source. Due to the poor (u, nu)-plane coverage, the location of the extra source can not be isolated unambiguously, but possibilities are suggested. The source must lie outside the supernova remnant shell, possibly associated with a concentration of emission north of the shell, or lying outside the gap in the northeastern side of the shell. The flux and spectral index deduced for the compact source depend on the assumed size, with a range of 100 Jy and 500 Jy at 74 MHz. If the source is associated with the supernova explosion, it must have been traveling at least 5000 km/sec.

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