Spectroscopic differences between supernovae of type IA in early-type and in late-type galaxies

Details Spectroscopic differences between supernovae of type IA in early-type and in late-type galaxies Spectroscopic differences between supernovae of type IA in early-type and in late-type galaxies

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.2231b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 6, p. 2231-2235.

Astronomy and Astrophysics

Astronomy

82

Expansion, Propagation Velocity, Supernovae, Astronomical Spectroscopy, Galaxies

Scientific paper

Published data are used to derive a uniform set of blueshifts in the lambda 6355 feature of Si II for 33 SNe Ia. All seven SNe Ia with blueshifts at 10 days past maximum of 9500 km/s occurred in early-type galaxies. The observed dependence of Si II blueshift on parent-galaxy type indicates that differing SNe Ia blueshifts are due to global physical differences, rather than to asymmetries in their expansion that are viewed from different directions. It is speculated that SNe Ia with low expansion velocities might, in the mean, have older progenitors than those with high expansion velocities.

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