Radio search for Crab-like nebulae in M33

Journal Article · Sun Nov 01 04:00:00 EST 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165762· OSTI ID:5465269

Reynolds, S P; Fix, J D

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. 27 references.

• Research Organization: North Carolina State Univ., Raleigh; Iowa Univ., Iowa City
• OSTI ID: 5465269
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 322; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BACKGROUND RADIATION
CONFIGURATION
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
GALAXIES
H2 REGIONS
MORPHOLOGY
NEBULAE
RADIATIONS
RADIOWAVE RADIATION
SPIRAL CONFIGURATION
SUPERNOVA REMNANTS