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Modelling the extinction properties of galaxies.

Granato, G.L.; Silva, L.; Bressan, A.; Lacey, C.G.; Baugh, C.M.; Cole, S.; Frenk, C.S.


G.L. Granato

L. Silva

A. Bressan

C.G. Lacey


José M. Vílchez

Grażyna Stasińska

Enrique Pérez


Recently (Granato, Lacey, Silva et al., 2000, astro-ph/0001308) we have combined our spectrophotometric galaxy evolution code which includes dust reprocessing (GRASIL, Silva et al.,1998) with semi-analytical galaxy formation models (GALFORM, Cole et al., 1999). One of the most characteristic features of the former is that the dust is divided in two main phases: molecular cloud complexes, where stars are assumed to be born, and the diffuse interstellar medium. As a consequence, stellar populations of different ages have different geometrical relationships with the two phases, which is essential in understanding several observed properties of galaxies, in particular those undergoing major episodes of star formation at any redshift. Indeed, our merged GRASIL+GALFORM model reproduces fairly well the SEDs of normal spirals and starbursts from the far-UV to the sub-mm and their internal extinction properties. In particular in the model the observed starburst attenuation law (Calzetti, 1999) is accounted for as an effect of geometry of stars and dust, and has nothing to do with the optical properties of dust grains.


Granato, G., Silva, L., Bressan, A., Lacey, C., Baugh, C., Cole, S., & Frenk, C. (2001). Modelling the extinction properties of galaxies. In J. M. Vílchez, G. Stasińska, & E. Pérez (Eds.), The Evolution of Galaxies: I-Observational Clues (589-592). Springer Verlag.

Publication Date 2001
Publisher Springer Verlag
Pages 589-592
Book Title The Evolution of Galaxies: I-Observational Clues.
Chapter Number 5
ISBN 9789048158218