The infrared supernova rate in starburst galaxies *
Istituto di Radioastronomia, sezione di Firenze, Largo E. Fermi 5, 50125, Firenze, Italy e-mail: email@example.com
2 INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125, Firenze, Italy
3 Dipartimento di Astronomia, Univesità di Roma, via della vasca navale 86, Roma, Italy
4 Dipartimento di astronomia, Università di Firenze, Largo E. Fermi 5, 50125, Firenze, Italy
5 ESO, Ave. Alonso de Cordova 3107, Casilla 19, Santiago 19001, Chile
6 Telescopio Nazionale Galileo, Aptdo de Correos 565, 38700 Santa Cruz de la Palma, Canary Island, Spain
7 Steward Observatory, Univ. of Arizona, Tucson, AZ85721, USA
Corresponding author: F. Mannucci, firstname.lastname@example.org
Accepted: 13 February 2003
We report the results of our ongoing search for extincted supernovae (SNe) at near-infrared wavelengths. We have monitored at 2.2 μm a sample of 46 Luminous Infrared Galaxies and detected 4 SNe. The number of detections is still small but sufficient to provide the first estimate of supernova rate at near-infrared wavelengths. We measure a SN rate of SNu which is an order of magnitude larger than observed in quiescent galaxies. On the other hand, the observed near-infrared rate is still a factor 3-10 smaller than that estimated from the far-infrared luminosity of the galaxies. Among various possibilities, the most likely scenario is that dust extinction is so high () to obscure most SNe even in the near-IR. The role of type Ia SNe is also discussed within this context. We derive the type Ia SN rate as a function of the stellar mass of the galaxy and find a sharp increase toward galaxies with higher activity of star formation. This suggests that a significant fraction of type Ia SNe are associated with young stellar populations. Finally, as a by-product, we give the average K-band light curve of core-collapse SNe based on all the existing data, and review the relation between SN rate and far-infrared luminosity.
Key words: supernovae: general / supernovae: individual: SN 1999gd / supernovae: individual: SN 2000bg / infrared: stars
Based on observations collected at the European Southern Observatory, Chile (proposal 66.B-0417), at the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Centro Galileo Galilei of the INAF (Istituto Nazionale di Astrofisica), and at the Steward Observatory 61'' telescope.
© ESO, 2003