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Stars in the Hubble Ultra Deep Field
N. Pirzkal, K. C. Sahu, A. Burgasser +11
We identified 46 unresolved source candidates in the Hubble Ultra Deep Field, down to i775 = 29.5. Unresolved objects were identified using a parameter S, which measures the deviat…
Spectroscopic Properties of the z=4.5 Lyman-alpha Emitters
Steve Dawson, James E. Rhoads, Sangeeta Malhotra +6
We present Keck/LRIS optical spectra of 17 Lya-emitting galaxies and one Lyman break galaxy at z=4.5 discovered in the Large Area Lyman Alpha (LALA) survey. The survey has identifi…
Probing a GRB progenitor at a redshift of z=2: a comprehensive observing campaign of the afterglow of GRB 030226
S. Klose, J. Greiner, A. Rau +38
We report results from a comprehensive follow-up observing campaign of the afterglow of GRB 030226, including VLT spectroscopy, VLT polarimetry, and Chandra X-ray observations. In…
A Redshift z=5.4 Lyman alpha Emitting Galaxy with Linear Morphology in the GRAPES/UDF Field
James E. Rhoads, Nino Panagia, Rogier A. Windhorst +21
We have discovered an extended Lyman alpha plume associated with a compact source at redshift 5.4 in slitless spectroscopic data from the Grism ACS Program for Extragalactic Scienc…
Luminosity functions of Lyman-alpha emitters at z=6.5, and z=5.7: evidence against reionization at z=6
Sangeeta Malhotra, James Rhoads
Lyman-alpha emission from galaxies should be suppressed completely or partially at redshifts beyond reionization. Without knowing the instrinsic properties of galaxies at z = 6.5,…
A Galaxy at z = 6.545 and Constraints on the Epoch of Reionization
Daniel Stern, Sarah A. Yost, Megan E. Eckart +5
We report the discovery of a Lyman-alpha-emitting galaxy at redshift z=6.545 serendipitously identified in the course of spectroscopic follow-up of hard X-ray sources on behalf of…