Do the compact radio sources in NGC 253 and M82 fade over time?

Details Do the compact radio sources in NGC 253 and M82 fade over time? Do the compact radio sources in NGC 253 and M82 fade over time?

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424l..29u&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 424, no. 1, p. L29-L32

Astronomy and Astrophysics

Astronomy

33

Active Galactic Nuclei, Data Reduction, Infrared Sources (Astronomy), Normal Density Functions, Radio Spectra, Starburst Galaxies, Supernovae, Bolometers, Flux Density, Frequencies, Image Processing, Light Curve, Radio Emission, Stellar Luminosity, Time Measurement, Very Large Array (Vla)

Scientific paper

The nearby starburst galaxy NGC 253 has been observed at a third epoch at 6 cm, and a second epoch at 3.6 cm, using the highest resolution configuration of the Very Large Array (VLA). Over a total time span of 4 yr between 1987 and 1991, no new compact radio sources have appeared. The flux density limit ranges from 3 mJy (3 times the power of Cas A) for most of the main body of the source to approximately 0.3 mJy off the diffuse source surrounding the nucleus. Furthermore, there is no evidence for significant source fading over 4 yr, in contrast to the result reported by Kronberg & Sramek (1985) for M82. More recent data suggest that, except for the strongest source in that galaxy, the compact radio sources in M82 may not be fading after all. If this suggestion proves correct, supernova rates of 0.2-0.3/yr in M82, estimated based on the assumed source fading, are incorrect. More accurate limits on source fading indicate that the current rate of production of radio supernovae in M82 is no greater than 0.1/yr, while that in NGC 253 is no greater than 0.25/yr.

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