New photometric models of galactic evolution applied to the HDF

Citation
Gl. Granato et al., New photometric models of galactic evolution applied to the HDF, ASTRO SP SC, 276(2-4), 2001, pp. 973-978
Citations number
3
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICS AND SPACE SCIENCE
ISSN journal
0004-640X → ACNP
Volume
276
Issue
2-4
Year of publication
2001
Pages
973 - 978
Database
ISI
SICI code
0004-640X(2001)276:2-4<973:NPMOGE>2.0.ZU;2-V
Abstract
We summarize our modelling of galaxy photometric evolution (the GRASIL code ). By including the effects of dust grains and PAH molecules in a two-phase clumpy medium, where clumps are associated with star-forming regions, we r eproduce the observed UV to radio SEDs of galaxies with star formation rate s from zero to several hundred M. yr(-1). GRASIL is a powerful tool for inv estigating star formation, the initial mass function and the supernova rate in nearby starbursts and normal galaxies, as well as for predicting the ev olution of luminosity functions of different types of galaxies at wavelengt hs covering six decades. It may be interfaced with any device to provide th e star formation and metallicity histories of a galaxy. As an application, we have investigated the properties of early-type galaxies in the HDF, trac king the contribution of this population to the cosmic star formation histo ry, which has a broad peak between z = 1.5 and 4. To explain the absence of objects at z greater than or similar to 1.3, we suggest a sequence of dust -enshrouded merger-driven starbursts in the first few Gyr of galaxy lifetim es. We are at present working on a complementary sample of late-type object s selected in a similar way.