New photometric models of galactic evolution applied to the HDF |
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Authors: | Gian Luigi Granato Laura Silva Luigi Danese Giulia Rodighiero Alberto Franceschini Gianni Fasano Alessandro Bressan |
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Institution: | (1) Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy E-mail;(2) SISSA, Via Beirut 2–4, I-34014 Trieste, Italy;(3) Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy |
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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 reproduce the observed
UV to radio SEDs of galaxies with star formation rates from zero to several hundred M
⊙ yr-1.GRASIL is a powerful tool for investigating star formation, the initial mass function and the supernova rate in nearby starbursts
and normal galaxies, as well as for predicting the evolution of luminosity functions of different types of galaxies at wavelengths
covering six decades. It may be interfaced with any device to provide the star formation and metallicity histories of a galaxy.
As an application, we have investigated the properties of early-type galaxies in the HDF, tracking the contribution of this
population to the cosmic star formation history, which has a broad peak between z = 1.5 and 4.To explain the absence of objects at z ≳ 1.3, we suggest a sequence of dust-enshrouded merger-driven starbursts in the first few Gyr of galaxy lifetimes. We are
at present working on a complementary sample of late-type objects selected in a similar way.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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