Supernova rates, galaxy emission, and Hubble type

Details Supernova rates, galaxy emission, and Hubble type Supernova rates, galaxy emission, and Hubble type

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..845v&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, March 1991, p. 845-847.

Astronomy and Astrophysics

Astronomy

4

H Alpha Line, Nitrogen, Spiral Galaxies, Supernovae, Forbidden Transitions, Galactic Evolution, Galactic Structure, Interstellar Matter

Scientific paper

Supernova discovery frequency is found to correlate with emission-line (H-alpha + forbidden N II line) equivalent width, except for the most active galaxies in which some supernovae might be hidden by dust. SNII occur preferentially in active galaxies with emission-line EW not less than 20 A, whereas SNIa favor less active galaxies with EW less than 20 A. The intrinsic frequency of supernovae is found to be an order of magnitude higher in Sc galaxies than it is in early type spirals. The relatively high frequency of SNIa in late-type galaxies suggests that not all such objects have old progenitors.

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