EDP Sciences
Free access
Volume 433, Number 3, April III 2005
Page(s) 807 - 814
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20041411

A&A 433, 807-814 (2005)
DOI: 10.1051/0004-6361:20041411

The supernova rate per unit mass

F. Mannucci1, M. Della Valle2, 3, N. Panagia3, E. Cappellaro4, G. Cresci5, R. Maiolino2, A. Petrosian6 and M. Turatto7

1  CNR - IRA, Largo E. Fermi 5, 50125 Firenze, Italy
    e-mail: filippo@arcetri.astro.it
2  INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
3  Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
4  INAF, Osservatorio Astronomico di Capodimonte, salita Moiariello a Capodimonte 16, 80131 Napoli, Italy
5  Dipartimento di Astronomia, Universitá di Firenze, Largo E. Fermi 5, 50125, Firenze, Italy
6  Byurakan Astrophysical Observatory and Isaac Newton Institute of Chile, Armenian Branch, Byurakan 378433, Armenia
7  INAF, Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy

(Received 4 June 2004 / Accepted 17 November 2004 )

We compute the rate of supernovae (SNe) of different types along the Hubble sequence normalized to the near-infrared luminosity and to the stellar mass of the parent galaxies. This is made possible by the new complete catalog of near-infrared galaxy magnitudes obtained by 2MASS. We find that the rates of all SN types, including Ia, Ib/c and II, show a sharp dependence on both the morphology and the (B-K) colors of the parent galaxies and, therefore, on the star formation activity. In particular we find, with a high statistical significance, that the type Ia rate in late type galaxies is a factor ~20 higher than in E/S0. Similarly, the type Ia rate in the galaxies bluer than B-K=2.6 is about a factor of 30 larger than in galaxies with B-K>4.1. These findings can be explained by assuming that a significant fraction of Ia events in late spirals/irregulars originates in a relatively young stellar component.

Key words: stars: supernovae: general -- infrared: galaxies

© ESO 2005

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