Other
Scientific paper
Feb 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..554l&link_type=abstract
NOAO Proposal ID #2008A-0554
Other
Scientific paper
We have identified a population of star-forming galaxies at z 6 through the i-drop Lyman-break technique using HST/ACS. Using Spitzer/IRAC imaging (tracing the rest-frame optical), we discovered from SED-fitting that some of this population harbour relatively old stars (300-500Myr) with significant Balmer breaks, implying formation epochs of z 10. Our work suggests that UV photons from star formation at z 10 may play a key role in reionizing the Universe. However, these conclusions are drawn from the only field (GOODS-South) which has both deep Spitzer/IRAC imaging and many i-drop spectroscopic redshifts. Hence the global conclusions are compromised by cosmic variance. We have 72-hours on Spitzer to image 6 other sight-lines with deep ACS data; we propose to use GMOS multiobject mode to obtain spectroscopic redshifts, which are crucial to reduce the large uncertainties in fitting the stellar ages and masses, and hence inferring the preceding star formation history and the contribution to reionization.
Bunker Andrew
Chiu Kuenley
Douglas Laura
Eyles Laurence
Lacy Mark
No associations
LandOfFree
Redshifts for Spitzer-detected galaxies at z 6 - old stars in the first Gyr 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 Redshifts for Spitzer-detected galaxies at z 6 - old stars in the first Gyr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Redshifts for Spitzer-detected galaxies at z 6 - old stars in the first Gyr will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1528869