Hiden Star Formation: The Ultraviolet Perspective
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Many recent estimates of the star formation rate density at high redshift rely on rest-frame ultraviolet (UV) data. These are highly sensitive to dust absorption. Applying a correlation between the far-infrared (FIR) to UV flux ratio and UV color found in a local starbursts to galaxy samples out to z ~ 3, one can account for most of the FIR background. However, the correlation is based on a sample that does not include the most extreme starbursts, Ultra Luminous Infrared Galaxies (ULIGs). Our new UV images of ULIGs show that their FIR fluxes are underpredicted by this correlation by factors ranging from 7 to 70. We discuss how ULIGs compare to the various types of high-z galaxies: sub-mm sources, Lyman Break Galaxies, and Extremely Red Objects.
4 Pages, 2 figures. To appear in Proc. JD9, IAU Manchester 2000, `Cold Gas and Dust at High Redshift' ed. D.J.Wilner, Highlights of Astronomy Vol. 12. PASP. Revised with minor corrections (typographical and grammar)
4 Pages, 2 figures. To appear in Proc. JD9, IAU Manchester 2000, `Cold Gas and Dust at High Redshift' ed. D.J.Wilner, Highlights of Astronomy Vol. 12. PASP. Revised with minor corrections (typographical and grammar)