We study the star formation rate and dust extinction properties of a sample of nearby star-forming galaxies as derived from Halpha and UV ( similar to 2000 Angstrom) observations and we compare them to those of a sample of starburst galaxies. The dust extinction in Halpha 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 Halpha 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 Halpha to UV flux ratio is found to be larger by a factor similar to 2 for the starburst galaxies. We compare both samples with a purely UV selected sample of galaxies and we conclude that the mean Halpha and UV properties of nearby star-forming galaxies are more representative of UV-selected galaxies than starburst galaxies. We emphasize that the Halpha to UV flux ratio is strongly dependent on the dust extinction: the positive correlation found between F-Halpha/F-UV and F-FIR./F-UV vanishes when the Halpha and UV flux are corrected for dust extinction. The Halpha 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.

Buat, V., Boselli, A., Gavazzi, G., Bonfanti, C. (2002). Star formation and dust extinction in nearby star-forming and starburst galaxies. ASTRONOMY & ASTROPHYSICS, 383(3), 801-812.

Star formation and dust extinction in nearby star-forming and starburst galaxies

GAVAZZI, GIUSEPPE;
2002

Abstract

We study the star formation rate and dust extinction properties of a sample of nearby star-forming galaxies as derived from Halpha and UV ( similar to 2000 Angstrom) observations and we compare them to those of a sample of starburst galaxies. The dust extinction in Halpha 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 Halpha 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 Halpha to UV flux ratio is found to be larger by a factor similar to 2 for the starburst galaxies. We compare both samples with a purely UV selected sample of galaxies and we conclude that the mean Halpha and UV properties of nearby star-forming galaxies are more representative of UV-selected galaxies than starburst galaxies. We emphasize that the Halpha to UV flux ratio is strongly dependent on the dust extinction: the positive correlation found between F-Halpha/F-UV and F-FIR./F-UV vanishes when the Halpha and UV flux are corrected for dust extinction. The Halpha 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.
Articolo in rivista - Articolo scientifico
galaxies : starburst; ISM : dust extinction; galaxies : stellar content
English
801
812
Buat, V., Boselli, A., Gavazzi, G., Bonfanti, C. (2002). Star formation and dust extinction in nearby star-forming and starburst galaxies. ASTRONOMY & ASTROPHYSICS, 383(3), 801-812.
Buat, V; Boselli, A; Gavazzi, G; Bonfanti, C
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/22356
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