Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322..673r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 15, 1987, p. 673-680. Research supported by the Research Corp.
Astronomy and Astrophysics
Astronomy
14
Nebulae, Radio Sources (Astronomy), Spiral Galaxies, Supernova Remnants, Astronomical Spectroscopy, Background Radiation, Very Large Array (Vla)
Scientific paper
The results of a search for Crablike supernova remnants in M33 using the VLA and spectral indices and center-brightened morphology as discriminants are reported. The observations show that seven of the 12 are unresolved with a 0.3 arcsec beam. Of the five resolved sources, three have morphologies typical of background radio galaxies, and one may be a shell supernova remnant in M33. However, one 'source' is shown at high resolution to be composed of a complex of sources, mostly steep-spectrum, but containing one unresolved component with a flux at both frequencies of about 0.5 mJy. While this could be a Crablike remnant with a very flat spectrum, its properties are also consistent with those of a normal compact H II region. None of the other 11 objects fits the observational definition of a Crablike remnant. Thus M33 joins M31 and the Galaxy in exhibiting far fewer Crablike remnants than theory would predict.
Fix John D.
Reynolds Stephen P.
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