Type Ibc supernovae in disturbed galaxies: evidence for a top-heavy IMF

Details Type Ibc supernovae in disturbed galaxies: evidence for a top-heavy IMF Type Ibc supernovae in disturbed galaxies: evidence for a top-heavy IMF

2010-05-04

arxiv.org/abs/1005.0511v1

Astrophysical Journal 717 (2010) 342-347

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

22 pages, 5 figures, accepted for publication in ApJ

Scientific paper

10.1088/0004-637X/717/1/342

We compare the radial locations of 178 core-collapse supernovae to the R-band and H alpha light distributions of their host galaxies. When the galaxies are split into `disturbed' and `undisturbed' categories, a striking difference emerges. The disturbed galaxies have a central excess of core-collapse supernovae, and this excess is almost completely dominated by supernovae of types Ib, Ic and Ib/c, whereas type II supernovae dominate in all other environments. The difference cannot easily be explained by metallicity or extinction effects, and thus we propose that this is direct evidence for a stellar initial mass function that is strongly weighted towards high mass stars, specifically in the central regions of disturbed galaxies.

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