Issue |
A&A
Volume 419, Number 1, May III 2004
|
|
---|---|---|
Page(s) | 109 - 126 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20034049 | |
Published online | 23 April 2004 |
UV and FIR selected samples of galaxies in the local Universe*
Dust extinction and star formation rates
Laboratoire d'Astrophysique de Marseille, BP 8, 13376 Marseille Cedex 12, France e-mail: [veronique.buat;jose.donas;alessandro.boselli;bruno.milliard]@oamp.fr
Corresponding author: J. Iglesias-Páramo, jorge.iglesias@oamp.fr
Received:
4
July
2003
Accepted:
11
February
2004
We have built two samples of galaxies selected at 0.2 μm (hereafter UV)
and 60 μm (hereafter FIR) covering a sky area of 35.36 deg2. The UV selected sample contains 25 galaxies brighter than . All of them, but one elliptical,
are detected at 60 μm with a flux density larger or equal to 0.2 Jy.
The UV counts are significantly lower than the Euclidean extrapolation towards brighter fluxes of previous determinations.
The FIR selected sample contains
42 galaxies brighter than
Jy. Except four galaxies, all
of them have a UV counterpart at the limiting magnitude
mag. The mean
extinction derived from the analysis of the FIR
to UV flux ratio is ~1 mag for the UV selected sample
and ~2 mag for the FIR selected one.
For each sample we compare several indicators of the recent star formation
rate (SFR) based on the FIR and/or the UV emissions. We find
linear relationships with slopes close to unity between the different SFR indicator, which means that, over the whole converting offset. Various absolute calibrations for both samples are discussed in this paper.
A positive correlation between extinction and SFR is found when
both samples are considered together although with a considerable scatter.
A similar result is obtained when using the SFR normalized to the optical surface of the galaxies.
Key words: ISM: dust, extinction / ultraviolet: galaxies / infrared: galaxies
© ESO, 2004
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