A Unique High Resolution Window to Two Strongly Lensed Lyman Break Galaxies

A Unique High Resolution Window to Two Strongly Lensed Lyman Break Galaxies On rare occasions, the otherwise very faint Lyman Break Galaxies (LBGs) are magnified by gravitational lensing to provide exceptional targets for detailed spectroscopic and imaging studies. We propose HST WFPC2 and NICMOS imaging of two strongly lensed Lyman Break Galaxies (LBGs) that were recently discovered by members of our team. These two LBGs -- the "8 O'Clock Arc" and the "SDSS J1206+5142 Arc" -- are currently the brightest known LBGs, roughly 3 times brighter than the former record-holder, MS1512-cB58 (a.k.a. "cB58"). The z=2.73 "8 O'Clock Arc" extends ~10 arcsec in length and is magnified by a factor of 12. The z=2.00 "SDSS J1206+5142 Arc" also extends ~10 arcsec in length and is magnified by a factor of 30. Due to their brightness and magnification, these two strongly lensed LBGs offer an unprecedented opportunity for the very detailed investigation of two individual galaxies at high redshift. We are currently pursuing a vigorous ground-based campaign to obtain multi-wavelength (UV, optical, NIR, radio) observations of these two LBGs, but our campaign currently lacks a means of obtaining high-resolution optical/NIR imaging -- a lack that currently only HST can address. Our prime objective for this proposal is to obtain high resolution HST images of these two systems with two-orbit WFPC2 images in the BVI bands and two-orbit NICMOS/NIC2 images in the J and H bands. These data will allow us to construct detailed lensing models, probe the mass and light profiles of the lenses and their environments, and constrain the star formation histories and rest-frame UV/optical spectral energy distributions of the LBGs.

Deep multi band optical and NIR imaging using WEPC2 (F450W, F606W, F814W) and NICMOS/NIC2 (F110W, F160W) for the brightest strongly lensed Lyman Break galaxies,the 8 O'clock arc and SDSS J1206+5142 arc. None None None COSMOLOGY 12 false 0.0 0.0 false false false false false SUPPORTED GALAXY GRAVITATIONAL LENS 19.2 SDSS r J2000 00 22 40.9100 +14 31 10.40 J2000 GALAXY GRAVITATIONAL LENS 19.2 SDSS r J2000 12 06 2.0900 +51 42 29.50 J2000 WFPC2 Imaging No F450W WFPC2 Imaging No F606W WFPC2 Imaging No F814W WFPC2 Imaging No F450W WFPC2 Imaging No F606W WFPC2 Imaging No F814W NIC2 Imaging No No F110W NIC2 Imaging No No F160W NIC2 Imaging No No F110W NIC2 Imaging No No F160W POS-TARG DITHER 0.559017 LINE 0.559017 false false 143.1301 4 26.56505 WFPC2-BOX 1

false

POS-TARG DITHER DITHER 2.5 NIC-XSTRIP-DITH 2.5 false false 270.0 4 90.0 POS-TARG NIC-SQUARE-WAVE-DITH 0.0 2

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