Steve Dawson - UCB

Steve Dawson
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Publications Authored By Steve Dawson

We present a catalog of 59 z=4.5 Lyman alpha emitting galaxies spectroscopically confirmed in a campaign of Keck/DEIMOS follow-up observations to candidates selected in the Large Area Lyman Alpha (LALA) narrow-band imaging survey. We targeted 97 candidates for spectroscopic follow-up; by accounting for the variety of conditions under which we performed spectroscopy, we estimate a selection reliability of about 76%. Read More

We present the results of an optical and near-IR spectroscopic study of giant nebular emission line halos associated with three z > 3 radio galaxies, 4C 41.17, 4C 60.07 and B2 0902+34. Read More

We present the first results from the HST/ACS Grism Parallel Survey, a large program obtaining deep, slitless ACS grism spectroscopy of high-latitude HST parallel fields. We report on 11 high Galactic latitude fields here, each with grism integration times >12 ks. We identify 601 compact emission line galaxies at z < 1. Read More

Affiliations: 1UCB, 2STScI, 3STScI, 4JPL, 5NOAO, 6UCB, 7NOAO, 8U. of Science and Tech., China, 9UCB
Category: Astrophysics

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 identified a sample of ~350 candidate Lya-emitting galaxies at z=4. Read More

We present a redshift z=6.535 galaxy discovered by its Lyman alpha emission in a 9180A narrowband image from the Large Area Lyman Alpha (LALA) survey. The Ly-a line luminosity (1. Read More

Affiliations: 1UC Berkeley, 2UC Berkeley, 3JPL/Caltech, 4Caltech, 5UC Berkeley, 6IfA/Hawaii, 7UC Berkeley
Category: Astrophysics

We present optical and near-infrared Keck spectroscopy of CXOHDFN J123635.6+621424 (hereafter HDFX28), a hard X-ray source at a redshift of z = 2.011 in the flanking fields of the Hubble Deep Field-North (HDF-N). Read More

Narrow-band searches for Lyman alpha emission are an efficient way of identifying star-forming galaxies at high redshifts. We present Keck telescope spectra confirming redshifts z = 5.7 for three objects discovered in the Large Area Lyman Alpha (LALA) survey at Kitt Peak National Observatory. Read More

Affiliations: 1JPL/Caltech, 2OAT, 3UC-Davis and IGPP/LLNL, 4ESO, 5UC-Davis and IGPP/LLNL, 6JPL/Caltech, 7Univ. of Florida, 8Univ. of Florida, 9Univ. of Pittsburgh, 10UC-Berkeley, 11UC-Berkeley, 12KPNO/NOAO, 13Keck Observatory
Category: Astrophysics

We present our first results on field X-ray sources detected in a deep, 184.7 ks observation with the ACIS-I camera on Chandra. The observations target the Lynx field of SPICES, and contains three known X-ray-emitting clusters out to z=1. Read More

Affiliations: 1UC Berkeley, 2UC Berkeley, 3NOAO, 4IGPP/LLNL, 5IGPP/LLNL, 6JPL, 7IGPP/LLNL
Category: Astrophysics

We report the serendipitous detection in high-resolution optical spectroscopy of a strong, asymmetric Ly-alpha emission line at z = 5.190. The detection was made in a 2. Read More

Affiliations: 1JPL/Caltech, 2UC-Berkeley, 3UC-Berkeley, 4Univ. of Pittsburgh, 5UC-Berkeley, 6UC-Berkeley, 7KPNO/NOAO, 8JPL/Caltech, 9Univ. of Florida, 10UC-Berkeley, 11Caltech, 12Columbia, 13IGPP/LLNL and UC-Davis, 14Caltech, 15ESO, 16UC-Berkeley, 17IGPP/LLNL and UC-Davis, 18Johns Hopkins and Trieste, 19Univ. of Florida
Category: Astrophysics

We report on observations of a TypeII quasar at redshift z=3.288, identified as a hard X-ray source in a 185 ks observation with the Chandra X-ray Observatory and as a high-redshift photometric candidate from deep, multiband optical imaging. CXOJ084837. Read More

Affiliations: 1UC Berkeley, 2JPL, 3Cambridge, 4UC Berkeley, 5NOAO
Category: Astrophysics

We present a catalog of 74 galaxies detected serendipitously during a campaign of spectroscopic observations of the Hubble Deep Field North (HDF) and its environs. Among the identified objects are five candidate Ly-alpha emitters at z > 5, a galaxy cluster at z = 0.85, and a Chandra source with a heretofore undetermined redshift of z = 2. Read More

Affiliations: 1JPL/Caltech, 2JPL/Caltech, 3UC-Berkeley, 4UC-Berkeley, 5IGPP/LLNL, 6KPNO/NOAO, and, 7IGPP/LLNL, 8IGPP/LLNL
Category: Astrophysics

The identification of galaxies at extreme distances provides our most direct information on the earliest phases of galaxy formation. The distance implied by redshifts z > 5 makes this a challenging endeavor for even the most luminous sources; interpretation of low signal-to-noise ratio observations of faint galaxies is difficult and occasional misidentifications will occur. Here we report on STIS 123627+621755, a galaxy with a suggested spectroscopic redshift of z = 6. Read More

Affiliations: 1JPL/Caltech, 2UC-Berkeley, 3JPL/Caltech, 4IoA, Cambridge, 5UC-Berkeley, 6UC-Davis, 7Florida
Category: Astrophysics

We present observations of RD J030117+002025, a quasar at z=5.50 discovered from deep, multi-color, ground-based observations covering 74 square arcmin. This is the most distant quasar or AGN currently known. Read More