165 research outputs found
Star formation across cosmic time with radio surveys. The promise of the SKA
This lecture briefly reviews the major recent advances in radio astronomy
made possible by ultra-deep surveys, reaching microJansky flux density levels.
A giant step forward in many fields, including the study of the evolution of
the cosmic star formation history is expected with the advent of the Square
Kilometer Array (SKA).Comment: 28 pages, 3 figures, to be published in the Proceedings of the 3rd
Cosmology School in Cracow, July 201
Dust in High Redshift Radio Galaxies and the Early Evolution of Spheroidal Galaxies
Several lines of evidence suggest that early-type galaxies might have been
very dusty during their initial evolutionary stages, characterized by intense
star formation activity. The radio selection has provided, by far, the richest
samples of high- galaxies, most likely of early type, which may therefore
yield crucial direct information on the period when the bulk of stars were
born. In order to investigate the role of dust in these phases, we have
analyzed recent observations of a number of high- radio galaxies in the
framework of a self-consistent scenario for the evolution of early type
galaxies. The available data can be fully accounted for by ``opaque'' models
similar to that already used by Mazzei and De Zotti (1994a) to fit the spectrum
of the hyperluminous galaxy IRAS~F. However, there is still
considerable latitude for models. Good fits can be obtained with galactic ages
ranging from 0.05 to 2 Gyr. Crucial constraints may be provided by ground-based
sub-mm measurements and by observations with the forthcoming Infrared Space
Observatory (ISO).Comment: MNRAS accepted; latex file, 10 pages, 7 figures available upon
reques
Workshop summary and the future
We present a tentative summary of the many very interesting issues that have
been addresses at this workshop, focussing in particular on the perspectives
for measuring the polarization power spectra of the Cosmic Microwave Background
produced by scalar and tensor perturbations, in the presence of foregrounds.Comment: 8 pages, 3 figures, to appear in S. Cecchini et al., Astrophysical
Polarized Backgrounds, AIP Conf. Proceeding
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