On the birthrate of galactic supernovae

Details On the birthrate of galactic supernovae On the birthrate of galactic supernovae

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..74..273l&link_type=abstract

(Conference on Stellar Collapse, Supernovae and Neutron Star Formation, University of California, Santa Barbara, Calif., May 5-8

Astronomy and Astrophysics

Astrophysics

6

Star Distribution, Stellar Evolution, Supernovae, Brightness, Estimates, Extragalactic Radio Sources, Interstellar Magnetic Fields, Milky Way Galaxy, Pulsars, Spiral Galaxies, Supernova Remnants

Scientific paper

The birthrate of galactic supernovae is estimated in three different ways. The three ranges overlap, and it is suggested that 70 + or - 35 yr represents a more realistic estimate of the rate than some that have previously been made. The galactic supernova remnants and their observed systematic brightness gradients perpendicular to the galactic plane imply a scale height of about 200 pc for the remnant progenitors and a galactic magnetic field scale height of about 300 pc. Long standing anomalies associated with the young remnant AD 1006, the galactic loops, and faint remnants, are accounted for by the brightness gradient effect. This provides firm, independent evidence for the validity of the remnant method of deducing the birthrate of galactic supernovae.

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