Modelling the extinction properties of galaxies

Citation
Gl. Granato et al., Modelling the extinction properties of galaxies, ASTRO SP SC, 277, 2001, pp. 79-82
Citations number
5
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICS AND SPACE SCIENCE
ISSN journal
0004-640X → ACNP
Volume
277
Year of publication
2001
Supplement
1
Pages
79 - 82
Database
ISI
SICI code
0004-640X(2001)277:<79:MTEPOG>2.0.ZU;2-E
Abstract
Recently (Granato, Lacey, Silva et al., 2000, astro-ph/0001308) we have com bined our spectrophotometric galaxy evolution code which includes dust repr ocessing (GRASIL, Silva et al., 1998) with semi-analytical galaxy formation models (GALFORM, Cole et al. 1999). One of the most characteristic feature s of the former is that the dust is divided in two main phases: molecular c loud complexes, where stars are assumed to be born, and the diffuse interst ellar 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 th ose undergoing major episodes of star formation at any redshift. Indeed, ou r merged GRASIL+GALFORM model reproduces fairly well the SEDs of normal spi rals and starbursts from the far-UV to the sub-mm and their internal extinc tion properties. In particular in the model the observed starburst attenuat ion 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 .