Article (Scientific journals)
Near-infrared [Fe II] emission from supernova remnants and the supernova rate of starburst galaxies
Morel, Thierry; Doyon, R.; St-Louis, N.
2002In Monthly Notices of the Royal Astronomical Society, 329, p. 398-410
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Keywords :
SURVEYS; SUPERNOVA REMNANTS; GALAXIES: INDIVIDUAL: M33; GALAXIES: STARBURST; INFRARED: ISM
Abstract :
[en] In an effort better to calibrate the supernova rate of starburst galaxies as determined from near-infrared [FeII] features, we report on a [FeII] λ1.644μm line-imaging survey of a sample of 42 optically selected supernova remnants (SNRs) in M33. A wide range of [FeII] luminosities are observed within our sample (from less than 6 to 695L[SUB]solar[/SUB]). Our data suggest that the bright [FeII] SNRs are entering the radiative phase and that the density of the local interstellar medium (ISM) largely controls the amount of [FeII] emission. We derive the following relation between the [FeII] λ1.644μm line luminosity of radiative SNRs and the electronic density of the post-shock gas, n[SUB]e[/SUB]: L[SUB][FeII][/SUB] (L[SUB]solar[/SUB])~1.1n[SUB]e[/SUB] (cm[SUP]-3[/SUP]). We also find a correlation in our data between L[SUB][FeII][/SUB] and the metallicity of the shock-heated gas, but the physical interpretation of this result remains inconclusive, as our data also show a correlation between the metallicity and n[SUB]e[/SUB]. The dramatically higher level of [FeII] emission from SNRs in the central regions of starburst galaxies is most likely due to their dense environments, although metallicity effects might also be important. The typical [FeII]-emitting lifetime of a SNR in the central regions of starburst galaxies is found to be of the order of 10[SUP]4[/SUP]yr. On the basis of these results, we provide a new empirical relation allowing the determination of the current supernova rate of starburst galaxies from their integrated near-infrared [FeII] luminosity.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Morel, Thierry  ;  Inter University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007, India
Doyon, R.;  Département de Physique and Observatoire du Mont Mégantic, Université de Montréal, C. P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7, Canada
St-Louis, N.;  Département de Physique and Observatoire du Mont Mégantic, Université de Montréal, C. P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7, Canada
Language :
English
Title :
Near-infrared [Fe II] emission from supernova remnants and the supernova rate of starburst galaxies
Publication date :
01 January 2002
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
329
Pages :
398-410
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://de.arxiv.org/abs/astro-ph/0110500
Available on ORBi :
since 19 February 2010

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