ACS/NICMOS Imaging of Bright Lyman Break Galaxy Candidates from SDSS

Details ACS/NICMOS Imaging of Bright Lyman Break Galaxy Candidates from SDSS ACS/NICMOS Imaging of Bright Lyman Break Galaxy Candidates from SDSS

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10181b&link_type=abstract

HST Proposal ID #10181

Computer Science

Hst Proposal Id #10181 Galaxies

Scientific paper

The recent surprising discovery of six unusually bright {r 20 mag} Lyman break galaxy {LBG} candidates with z=2.45-2.80 in the Sloan Digital Sky Survey {SDSS} raises a number of questions that only HST can address. Specifically, what is the true nature of these objects, and what role if any is played by gravitational lensing? We propose to use the superior resolution and sensitivity of ACS and NICMOS to obtain deep images of these objects and their environments. Compared to SDSS images, HST will allow us to determine their morphologies {extended, point-source, or lensed}, the appearance of their environments {rich or poor}, and to detect any faint foreground groups or clusters that might be responsible for lensing these objects. All outcomes would be intruiging. If the objects are lensed, it increases from 1 {MS1512-cB58} to 7 the number of normal LBGs bright enough to study individually. If they are instead unlensed point sources, they will represent a new class of previously unidentified absorption-line quasars. Finally, if they are unlensed and extended star-forming galaxies, they are at least 4mag brighter than L_* LBGs, thus making them the most luminous star-forming objects yet seen, representing a heretofore unknown extreme population of objects.

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