84 gigahertz observations of five Crab-like supernova remnants
Flux density measurements at 3.6 mm have been made to extend the frequency coverage for three Crablike remnants and two Crablike components within remnants whose large-scale morphologies show shell-type structure. All five objects show flat, polarized, nonthermal radio spectra and associated X-ray emission characteristic of this class. The flux density is found to be lower than expected on the basis of an extrapolation of the spectrum from lower frequencies. If this is due to steepening caused by evolutionary effects, severe constraints can be put on the characteristics of the objects showing spectral steepening: all must be less than 2000 yr old, and the supernovae in which they were born must all have had very unusual properties. 30 refs.
- Research Organization:
- Instituto de Radioastronomia Milimetrica, Granada, Spain; North Carolina State University, Raleigh; National Radio Astronomy Observatory, Tucson, AZ
- OSTI ID:
- 6034242
- Journal Information:
- Astrophys. J.; (United States), Vol. 338
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
SUPERNOVA REMNANTS
MICROWAVE RADIATION
AGE ESTIMATION
BRIGHTNESS
CONSTRAINTS
ENERGY SPECTRA
FLUX DENSITY
MORPHOLOGY
PULSARS
RADIOASTRONOMY
RADIOWAVE RADIATION
SPECTROSCOPY
STAR EVOLUTION
SUPERNOVAE
X RADIATION
ASTRONOMY
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ERUPTIVE VARIABLE STARS
IONIZING RADIATIONS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
SPECTRA
STARS
VARIABLE STARS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources