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Star Formation History from Radio Observations:
A New Look at an Important Cosmological Parameter
R. B. Partridge et al.
Haverford College, USA
The radio wavelength luminosity of starburst galaxies correlates
well with their star formation rates (Condon, ARA & A 30, 1992).
Using this connection and three deep radio surveys (Fomalont et
al., AJ 102, 1991; Windhorst et al., Nature 375, 1995; Richards
et al., AJ 116, 1998), Haarsma and I construct the global star
formation history. Our results (see Haarsma et al., ApJ, 2000 for
details) show a steep increase from z=0 to z=1, matching cal-
culations of the global SFR based on optical observations, when
those observations have been corrected for the obscuration caused
by dust. We note that our method requires no corrections for
dust obscuration. We do, however, need to correct our results for
radio emission from AGN. We do so using the extensive optical
identications available in these three elds
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