The Faintest Radio Galaxies: Interacting Starbursts at z<1

Details The Faintest Radio Galaxies: Interacting Starbursts at z<1 The Faintest Radio Galaxies: Interacting Starbursts at z<1

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8191l&link_type=abstract

HST Proposal ID #8191

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Hst Proposal Id #8191 Distant Galaxies

Scientific paper

We propose deep WFPC2 imaging and STIS slitless spectroscopy of two of our ultra-deep VLA fields. Those 4- and 6-cm maps have 1-Sigma levels of 3 and 11 Mu-Jy, respectively, comparable to VLA observations of the HDF, and show 14 and 9 sources in statistically complete samples. Keck spectroscopy and imaging to B, R, I 26.5 have identified most of the sources as compact, luminous starbursting and interacting galaxies at redshifts z es1; about 25 at z>1.5. Our goals here are: {1} identify the remaining sources; {2} pinpoint regions of star formation; {3} quantify the incidence of interaction using spatially-resolved kinematics; {4} quantify morphologies; and {5} constrain the evolution of these faintest of radio sources. Only the HDF and one other field have such deep VLA, HST, and Keck data, and there is strong evidence that field-to-field variations are significant. WFPC2 images with F814 will provide the resolution needed to measure morphologies on sub-kpc scales, iden ti fy interaction- induced star-formation, and distinguish AGN from non-AGN components. Slitless spectroscopy with STIS will reveal faint emission-line sources invisible in our Keck images and will provide spatially-resolved kinematics, necessary to disentangle the starforming components in interacting systems. The VLA fields extend over some 8min each, so both WFPC2 and STIS can be used simultaneously.

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