Using Optically Faint Radio Sources to Pinpoint Dusty Proto-galaxies

Computer Science

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Hst Proposal Id #9174 Galaxies

Scientific paper

vspace-3mm Deep radio and submillimeter surveys show that at least one-half of the star-formation in the distant Universe remains hidden from optical surveys. We have recently isolated a number of high redshift, dusty starburst galaxies that remain invisible in ground based images to I_AB=25 and I_AB=28.5 in the Hubble Deep Field. These galaxies appear as faint radio sources with bright submillimeter counterparts {S_850>5 mJy}, demonstrating they are very dusty systems. The luminosities of these galaxies {10^12-13 L{sun} } suggest they are in the process of converting the bulk of their gas mass into stars, and will likely evolve into present day massive ellipticals. We propose to obtain deep STIS imaging for 7 of our high redshift {1< z <3} optically `invisible' ultraluminous galaxies, chosen from amongst our submillimeter- detected sample to display some hint of optical flux in our present ground-based imagery {I 26, 2Sigma}. The STIS images will thereby identify their dust obscured optical counterparts, and allow comparison of their optical and radio morphology in matching 0"pt 1 images. Do these distant ultraluminous galaxies resemble local analogs {e.g., Arp 220}? Are the optical counterparts to sub-mm/radio selected sources isolated collapsing spheroids or merger driven starbursts?

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