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Searching for Low Surface-brightness Galaxies in the Hubble Ultra Deep Field: Implications for the Star Formation Efficiency in Neutral Gas at z ~ 3
Arthur M. Wolfe, Hsiao-Wen Chen
(Abridged) The Kennicutt--Schmidt law relates the face-on star formation rate (SFR) per unit area with the face-on gaseous column density in nearby galaxies. Applying this relation…
On the Incidence of Strong MgII Absorbers Along GRB Sightlines
G. E. Prochter, J. X. Prochaska, H. -W. Chen +7
We report on a survey for strong (rest equivalent width W_r >= 1A), intervening MgII systems along the sightlines to long-duration gamma-ray bursts (GRBs). The GRB spectra which co…
A Shot in the Dark: A Technique for Locating the Stellar Counterparts of Damped Lyman Alpha Absorbers
John M. O'Meara, Hsiao-Wen Chen, David L. Kaplan
We present initial results from a Magellan telescope program to image galaxies that give rise to damped Lyman absorbers (DLAs) at 1.63 < z_DLA < 2.37. Our program differs from prev…
Probing the IGM/Galaxy Connection Toward PKS0405-123 III: The Galaxy Survey and Correlations with OVI Absorbers
Jason X. Prochaska, Benjamin J. Weiner, Hsiao-Wen Chen +1
We present a galaxy survey of the field surrounding PKS0405-123 performed with the WFCCD spectrometer at Las Campanas Observatory. The survey is comprised of two datasets: (1) a gr…
GRB Afterglows as a New Probe of the ISM and IGM at High Redshift
Hsiao-Wen Chen, Jason X. Prochaska, Josh S. Bloom
We summarize results from a study of the metallicity, relative abundances, gas density, and kinematics of dense media in the host environment of two Swift bursts, GRB050730 at z=3.…
Dissecting the Circumstellar Environment of Gamma-Ray Burst Progenitors
Jason X. Prochaska, Hsiao-Wen Chen, Joshua S. Bloom
We investigate properties of the interstellar medium (ISM) in galaxies hosting long-duration gamma-ray bursts (GRBs) from an analysis of atomic species (MgI, FeI) and excited fine-…