Eric Gawiser

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The combination of detections of anisotropy in the Cosmic Microwave Background radiation and observations of the large-scale distribution of galaxies probes the primordial density fluctuations of the universe on spatial scales varying by three orders of magnitude. These data are found to be inconsistent with the predictions of several popular cosmological(More)
We present new chemical abundance measurements of 16 damped Lyα systems at z > 1.5 and update our previous abundance analyses. The entire database presented here was derived from HIRES observations on the Keck I telescope, reduced with the same software package, and analysed with identical techniques. Altogether, we present a large, homogeneous database of(More)
This paper describes the acquisition and analysis of imaging data for the identification of galaxies associated with z ∼ 4 damped Lyα systems. We present deep BRI images of three fields known to contain four z ∼ 4 damped systems. We discuss the reduction and calibration of the data, detail the color criteria used to identify z ∼ 4 galaxies, and present a(More)
We publish the Keck / HIRES and Keck / ESI spectra that we have obtained during the first 10 years of Keck observatory operations. Our full sample includes 42 HIRES spectra and 39 ESI spectra along 65 unique sight lines providing abundance measurements on %85 DLA systems. The normalized data can be downloaded from the journal or from our supporting Web(More)
This paper presents chemical abundance measurements for 37 damped Lyα systems at z > 2.5 observed with the Echellette Spectrograph and Imager on the Keck II telescope. We measure the H I column densities of these damped systems through Voigt profile fits to their Lyα profiles and we implement the apparent optical depth method to determine ionic column(More)
Observations of damped Lyα systems offer a unique window on the neutral-gas reservoirs that gave rise to galaxies at high redshifts. This review focuses on critical properties such as the H I and metal content of the gas and on independent evidence for star formation. Together, these provide an emerging picture of gravitationally bound objects in which(More)
We present first results of a spectroscopic survey targeting K-selected galaxies at z = 2.0 − 2.7 using the GNIRS instrument on Gemini-South. We obtained near-infrared spectra with a wavelength coverage of 1.0–2.5 µm for 26 K-bright galaxies (K < 19.7) selected from the MUSYC survey using photometric redshifts. We successfully derived spectroscopic(More)
We summarize the theoretical and observational status of the study of the Cosmic Microwave Background radiation. Its thermodynamic spectrum is a robust prediction of the Hot Big Bang cosmology and has been confirmed observationally. There are now 76 observations of Cosmic Microwave Background anisotropy, which we present in a table with references. We(More)
  • Harold Francke, Eric Gawiser, Paulina Lira, Ezequiel Treister, Shanil Virani, Carie Cardamone +3 others
  • 2008
We present the first clustering results of X-ray selected AGN at z ∼ 3. Using Chandra X-ray imaging and UVR optical colors from MUSYC photometry in the ECDF-S field, we selected a sample of 58 z ∼ 3 AGN candidates. From the optical data we also selected 1385 LBG at 2.8 < z < 3.8 with R < 25.5. We performed auto-correlation and cross-correlation analyses,(More)
We use near-infrared (NIR) spectroscopy obtained with GNIRS on Gemini, NIRSPEC on KECK, and ISAAC on the VLT to study the rest-frame optical continua of three 'Distant Red Galaxies' (having J s − K s > 2.3) at z > 2. All three galaxy spectra show the Balmer/4000Å break in the rest-frame optical. The spectra allow us to determine spectroscopic redshifts from(More)