IAU01703
Presentation type requested: POSTER
CONSTRAINING STAR FORMATION HISTORY WITH DEEP RADIO DATA
Minh T Huynh
Research School of Astronomy and Astrophysics, Australian National University

The radio waveband is a powerful tool for studying star formation because it is unattenuated by dust obscuration, unlike any optical or UV tracers. Radio emission from star-forming galaxies comprises synchrotron radiation from relativistic electrons accelerated in supernova remnants and free-free emission in HII regions. Since both phenomena are linked to short-lived massive stars, sensitive radio observations can provide a measure of recent star formation out to moderate redshifts. The Australia Telescope Hubble Deep Field South (ATHDFS) survey consists of single-pointing observations at 1.4, 2.5, 5.2 and 8.7 GHz, reaching a sensitivity of ~10 microJy rms. Combining our data with optical/IR photometry and spectroscopy, we determine the redshift distribution of the ATHDFS radio sources. This, and deep radio source counts, constrain the evolution of star-forming galaxies which can be converted to a radio `Madau' diagram.

Jackson Carole A, Norris Ray P, Ekers Ron D

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