The rate of supernovae: biases and uncertainties

Details The rate of supernovae: biases and uncertainties The rate of supernovae: biases and uncertainties

1995-11-27

arxiv.org/abs/astro-ph/9511129v1

Astronomy and Astrophysics

Astrophysics

10 pages, uuencoded gzipped PostScript file including three figures. To appear in "Thermonuclear Supernovae", Kluwer Academic

Scientific paper

Using an updated SN list and galaxy parameters from the RC3 catalog, we have revisited two well know biases affecting SN searches. We show that the bias in the central region of galaxies is negligible for galaxies closer than 40 Mpc (H=75), but causes the loss of almost 50% of SNe in the distance range 80-160 Mpc. This bias has a weak dependence on the galaxy and SN types. Instead the bias due to the inclination of spiral galaxies is more severe especially for SNII in late spirals with only 1 SNe out of 5 being detected in edge--on galaxies. The two effects seem interconnected with a more severe loss of SNe in the central part of inclined spirals. Our best estimates of the SN rates are reported along with a quantitative estimates of the different source of errors.

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