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Date and Time of the Query: 2019-05-20 T19:47:59 PDT
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For refcode 2002A&A...383..801B:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2002A&A...383..801B Star formation and dust extinction in nearby star-forming and starburst galaxies V. Buat, A. Boselli, G. Gavazzi and C. Bonfanti Laboratoire d'Astrophysique de Marseille, BP 8, 13376 Marseille Cedex 12, France; e-mail: alessandro.boselli@astrsp-mrs.fr Universita degli studi di Milano-Bicocca, Dipatimento di Fisica, Piazza dell'Ateneo Nuovo 1, 20126 Milano, Italy; e-mail: giuseppe.gavazzi@mib.infn.it; cristian.bonfanti@mib.infn.it Received 28 August 2001/Accepted 18 December 2001 Abstract. We study the star formation rate and dust extinction properties of a sample of nearby star-forming galaxies as derived from H{alpha} and UV (~2000 A) observations and we compare them to those of a sample of starburst galaxies. The dust extinction in H{alpha} is estimated from the Balmer decrement and the extinction in UV using the FIR to UV flux ratio or the attenuation law for starburst galaxies of Calzetti et al. (2000). The H{alpha} and UV emissions are strongly correlated with a very low scatter for the star-forming objects and with a much higher scatter for the starburst galaxies. The H{alpha} to UV flux ratio is found to be larger by a factor ~2 for the starburst galaxies. We compare both samples with a purely UV selected sample of galaxies and we conclude that the mean H{alpha} and UV properties of nearby star-forming galaxies are more representative of UV-selected galaxies than starburst galaxies. We emphasize that the H{alpha} to UV flux ratio is strongly dependent on the dust extinction: the positive correlation found between F_H{alpha}_/F_UV_ and F_FIR_/F_UV_ vanishes when the H{alpha} and UV flux are corrected for dust extinction. The H{alpha} to UV flux ratios converted into star formation rate and combined with the Balmer decrement measurements are tentatively used to estimate the dust extinction in UV. Key words: galaxies: starburst - ISM: dust extinction - galaxies: stellar content
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