VLA observations of the luminous supernova remnant in NGC 4449

Details VLA observations of the luminous supernova remnant in NGC 4449 VLA observations of the luminous supernova remnant in NGC 4449

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..140b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 1, 1983, p. 140-143.

Astronomy and Astrophysics

Astronomy

18

Radio Astronomy, Supernova Remnants, Radiant Flux Density, Radio Interferometers, Radio Spectra, Variability

Scientific paper

Observations of the SNR in NGC 4449 at 1.47, 5, and 15 GHz using the VLA are reported. The variation of the peak flux density and the time variations of the SNR are shown along with the SNR contours and spectrum. Adopting a distance of 5 Mpc for NGC 4449, an expansion velocity of 3500 km/s, and an upper limit of 0.07 arcsec for the angular size from the VLA 15 GHz observations, an age of less than 236 years is derived. This is consistent with the 200 years estimated by Kirshner and Blair (1980) based on optical measurements. The SNR shows evidence for significant variability at 5 GHz.

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