Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21360819r&link_type=abstract
American Astronomical Society, AAS Meeting #213, #608.19
Other
Scientific paper
We introduce an extremely deep U-band image taken of the Hubble Ultra Deep Field (HUDF), with a one sigma depth of 30.7 mag arcsec-2 and a detection limiting magnitude of 28 mag arcsec-2. The observations were carried out on the Keck I telescope using the LRIS-B detector. The U-band image substantially improves the accuracy of photometric redshift measurements of faint galaxies in the HUDF at z=[2.5,3.5]. The U-band for these galaxies is attenuated by lyman limit absorption, allowing for more reliable selections of candidate Lyman Break Galaxies (LBGs) than from photometric redshifts without U-band. We present a reliable sample of 300 LBGs at z=[2.5,3.5] in the HUDF. Accurate redshifts of faint galaxies at z=[2.5,3.5] are needed to obtain empirical constraints on the star formation efficiency of neutral gas at high redshift. Wolfe & Chen (2006) showed that the star formation rate (SFR) density in damped Ly-alpha absorption systems (DLAs) at z=[2.5,3.5] is significantly lower than predicted by the Kennicutt-Schmidt law for nearby galaxies. One caveat to this result that we wish to test is whether LBGs are embedded in DLAs. If in-situ star formation is occurring in DLAs, we would see it as extended low surface brightness emission around LBGs. We shall use the more accurate photometric redshifts to create a sample of LBGs around which we will look for extended emission in the more sensitive and higher resolution HUDF images. The absence of extended emission would put limits on the SFR density of DLAs associated with LBGs at high redshift. On the other hand, detection of faint emission on scales large compared to the bright LBG cores would indicate the presence of in situ star formation in those DLAs. Such gas would presumably fuel the higher star formation rates present in the LBG cores.
Armandroff Taft E.
Chen How-Wei
Cooke Jeff
Rafelski Marc
Wirth Gregory D.
No associations
LandOfFree
Lyman Break Galaxies in the Hubble Ultra Deep Field through Deep U-Band Imaging does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Lyman Break Galaxies in the Hubble Ultra Deep Field through Deep U-Band Imaging, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lyman Break Galaxies in the Hubble Ultra Deep Field through Deep U-Band Imaging will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1765658