POPULATION SYNTHESIS MODELS FOR NORMAL GALAXIES WITH DUSTY DISKS

A POPULATION OF HOT, DUSTY ULTRALUMINOUS GALAXIES AT z 2

We report spectroscopic redshifts for 18 Jy radio galaxies at a mean redshift of z 1⁄4 2:2 that are faint at both submillimeter and optical wavelengths. While the radio fluxes of these galaxies could indicate far-IR luminosities comparable to high-redshift submillimeter-selected galaxies (k10 L ), none are detected in the submillimeter. We propose that this new population of galaxies represents...

Evolutionary Population Synthesis Models of Primeval Galaxies: a Critical Appraisal

Ages of Elliptical Galaxies from Population Synthesis Models

New population synthesis models, with the eeects of metallicity spread and the horizontal-branch (HB) morphology , provide a way to break the well-known age-metallicity degeneracy in the analysis of the integrated light of elliptical galaxies. Our models suggest that the far-UV radiation of these systems is dominated by a minority population of metal-poor, hot HB stars and their post-HB progeny...

Extremely Red and Dusty Galaxies

Preliminary results of a project aiming at unveiling the nature of the extremely red galaxies (ERGs) 1 found in deep optical-NIR surveys are presented. Very little is known about these objects, the critical issue being whether they are old ellipticals at z>1 or distant star-forming galaxies strongly reddened by dust extinction. We expect to shed light onto the unknown nature of these galaxies b...

NICMOS Imaging of Dusty Circumstellar Disks