Second-epoch VLA observations of compact radio sources in NGC 253

Details Second-epoch VLA observations of compact radio sources in NGC 253 Second-epoch VLA observations of compact radio sources in NGC 253

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102..875u&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Sept. 1991, p. 875-881. Research supported by University of California.

Astronomy and Astrophysics

Astronomy

38

Extragalactic Radio Sources, Starburst Galaxies, Very Large Array (Vla), Astronomical Spectroscopy, Flux Density, Supernova Remnants

Scientific paper

Results are presented of second-epoch 6-cm VLA observations of the starburst galaxy NGC 253 in early 1989, approximately 18 months after the first observations identified more than 30 compact radio sources in the galaxy. The galaxy was also mapped at 3.6 cm. No new radio sources were found at 6 cm after the 18-month interval. Assuming that at least two-thirds of new type II supernovae would have been detectable radio emitters stronger than 3 mJy, the 95-percent confidence upper limit to the SN rate is 3.0/yr. None of the 13 sources with flux densities above 1 mJy showed significant decreases in strength over 18 months; the strongest source showed an apparent increase of 6.5 percent in flux density, which differs from that of Kronberg and Sramek (1985) for M82. The 3.6 map identified a number of new sources because of the reduction of confusion. The available spectral data show that a few of the resolved sources may be H II regions.

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