Multiwavelength analyses of faint infrared galaxies

Mathematics – Logic

Scientific paper

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Galaxy, Spitzer, Infrared, Counts, Spectroscopy, Iso, Ulirg, Sed, Iras, Rdcs

Scientific paper

This Thesis follows a chronological outline, covering the development of infrared space facilities in the last decades: IRAS, ISO and Spitzer galaxies are studied.
Optical, near- and mid-IR spectroscopy, optical spectropolarimetry and broad-band UV to sub-mm analysis of nearby Ultra Luminous Infrared Galaxies are used as ``local laboratory'' for studying distant IR, active, dusty galaxies.
Optical and near-IR spectroscopy of 15 microns ISO sources is analysed; a comparison of the broad-band spectral energy distributions of such objects to those of intermediate-redshift early-type galaxies and distant Lyman-break sources follows.
Early Spitzer/SWIRE data are used here to study the optical to near-IR restframe SEDs of galaxies up to redshift ~3, exploiting both near- and mid-IR observations by IRAC and MIPS. The evolution of actively star-forming sources is analyzed through modeling of differential mid-IR source counts. A subsample of field galaxies from the GOODS survey is finally compared to the members of the RDCS 1252.9-2927 cluster, lying at a redshift z=1.237.

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