Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21322002b&link_type=abstract
American Astronomical Society, AAS Meeting #213, #220.02; Bulletin of the American Astronomical Society, Vol. 41, p.390
Astronomy and Astrophysics
Astronomy
Scientific paper
Ultraviolet is one of the main probes of star formation. Indeed, young stars emit the bulk of their energy in ultraviolet. Distant galaxy surveys (z 2-7) often rely on restframe UV redshifted in the optical and near-infrared, to provide good sensitivity and spatial resolution. Thus our understanding of star formation in the distant universe is crucially dependent on our knowledge of ultraviolet emission.
If ultraviolet is a terrific tool to study star formation in distant galaxies it also severely suffer from dust extinction. To correct for the effects of extinction, the "Starburst obscuration curve” in combination with the observed UV slope is routinely used. However there is evidence that this method gives poor results for quiescent star forming galaxies overestimating the UV luminosity by factors that range from a few to order of magnitude. With the advent of deeper surveys, the UV luminosity function can be viewed with some suspicion.
The aims of this project are:
1) Are we looking at the current star formation in the UV emission of normal star forming galaxies? Is dust hiding the earlier phases?
2) What is the dependence on the intensity of star formation? How is UV emission different in starburst and quiescent galaxies? What are the local differences between those two classes?
3) How those differences relate to extinction correction and how can we build a star formation rate estimator that can be used on distant galaxies?
We present here some preliminary results of this on-going work based on detailed study of half-dozen of galaxies. Using the IRX-Beta diagram, we will show what are the main differences between starburst and quiescent galaxies. Finally we will present the suspected parameters that can drive the differences between and discuss their effect.
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