EDP Sciences
Free access
Volume 393, Number 1, October I 2002
Page(s) 33 - 42
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20020925

A&A 393, 33-42 (2002)
DOI: 10.1051/0004-6361:20020925

Spectral Energy Distributions of starburst galaxies in the 900-1200 $\rm\AA$ range

V. Buat1, D. Burgarella1, J. M. Deharveng1 and D. Kunth2

1  Laboratoire d'Astrophysique de Marseille, BP 8, 13376 Marseille Cedex 12, France
    e-mail: denis.burgarella@astrsp-mrs.fr,jean-michel.d eharveng@astrsp-mrs.fr
2  Institut d'Astrophysique de Paris, Bd Arago, Paris, France
    e-mail: kunth@iap.fr

(Received 21 May 2002 / Accepted 6 June 2002 )

We present the 970-1175  $\rm\AA$ spectral energy distributions (SEDs) of 12 starburst galaxies observed with the Far Ultraviolet Spectroscopic Explorer FUSE. We benefit from the high spectral resolution of FUSE to estimate a continuum as much as possible unaffected by the interstellar lines. The continuum is rather flat with, in a few cases, a decrease at $\rm\lambda < 1050~\AA$, the amplitude of which is correlated with various indicators of dust extinction. The far-UV SEDs are compared with synthetic population models. The galaxies with almost no extinction have an SED consistent with on-going star formation over some Myrs. We derive a mean dust attenuation law in the wavelength range 965-1140  $\rm\AA$ by comparing the SED of obscured galaxies to an empirical dust-free SED. The extinction is nearly constant longward of 1040  $\rm\AA$ but rises at shorter wavelengths. We compare our results with other studies of extinction for galaxies and stars in this wavelength range.

Key words: galaxies: starburst -- ISM: dust, extinction -- ultraviolet: galaxies

Offprint request: V. Buat, veronique.buat@astrsp-mrs.fr

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