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A Rejuvenated Universe Without Initial Singularity
Eric Gawiser
Cosmological observations strongly suggest the presence of dark energy which comprises the majority of the current energy density of the universe. The equation of state relating th…
An X-ray Selected AGN at z=4.6 Discovered by the CYDER Survey
Ezequiel Treister, Francisco J. Castander, Thomas J. Maccarone +4
We present the discovery of a high redshift, X-ray selected AGN by the Calan-Yale Deep Extragalactic Research (CYDER) survey: CXOCY J033716.7-050153, located at , the secon…
The Age-Metallicity Relation of the Universe in Neutral Gas: The First 100 Damped Lya Systems
Jason X. Prochaska, Eric Gawiser, Arthur M. Wolfe +2
We present accurate metallicity measurements for 121 damped Lya systems at 0.5<z<5 including ~50 new measurements from our recently published Echellette Spectrograph and Imager sur…
The ESI/KeckII Damped Lya Abundance Database
Jason X. Prochaska, Eric Gawiser, Arthur M. Wolfe +2
This paper presents chemical abundance measurements for 37 damped Lya systems at z>2.5 observed with the Echellette Spectrograph and Imager on the KeckII telescope. We measure the…
CII* Absorption in Damped Lyman Alpha Systems: (II) A New Window on the Star Formation History of the Universe
Arthur M. Wolfe, Eric Gawiser, Jason X. Prochaska
Starting from the SFR per unit physical area, determined for DLAs using the C II* method, we obtain the SFR per unit comoving volume at 3, and find that it agrees wit…
CII* Absorption in Damped Lyman Alpha Systems: (I) Star Formation Rates in a Two-Phase Medium
Arthur M. Wolfe, Jason X. Prochaska, Eric Gawiser
We describe a technique that for the first time measures star formation rates (SFRs) in damped Lyman alpha systems(DLAs) directly. We assume that massive stars form in DLAs, and th…