David Syphers
University of Washington
14 Papers
204 Citations
David Syphers is an academic researcher from University of Washington. The author has contributed to research in topics: Quasar & Reionization. The author has an hindex of 11, co-authored 14 publications. Previous affiliations of David Syphers include University of Colorado Boulder & Eastern Washington University.
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Papers
An hst/cos survey of the low-redshift intergalactic medium. i. survey, methodology, and overall results
Charles W. Danforth,Brian A. Keeney,Evan M. Tilton,J. Michael Shull,John T. Stocke,Matthew L. Stevans,Matthew L. Stevans,Matthew M. Pieri,Matthew M. Pieri,Blair D. Savage,Blair D. Savage,David Syphers,David Syphers,Britton D. Smith,Britton D. Smith,James C. Green,Cynthia S. Froning,Cynthia S. Froning,Steven V. Penton,Steven V. Penton,S. Osterman,S. Osterman +21 more
TL;DR: In this paper, the authors used high-quality, medium-resolution Hubble Space Telescope/Cosmic Origins Spectrograph (HST/COS) observations of 82 UV-bright active galactic nuclei (AGNs) at redshifts z(AGN) \textless 0.85 to construct the largest survey of the low-redshift intergalactic medium (IGM) to date: 5138 individual extragalactic absorption lines in H I and 25 different metal-ion species grouped into 2611 distinct redshift systems at z(abs) = 21.
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A Large, Uniform Sample of X-ray Emitting AGN from the ROSAT All-Sky and Sloan Digital Sky Surveys: the Data Release 5 Sample
Scott F. Anderson,Bruce Margon,Wolfgang Voges,Richard M. Plotkin,David Syphers,Daryl Haggard,Matthew J. Collinge,Jillian Meyer,Michael A. Strauss,Marcel A. Agüeros,Patrick B. Hall,L. Homer,Zeljko Ivezic,Gordon T. Richards,Michael W. Richmond,Donald P. Schneider,Gregory S. Stinson,Daniel E. Vanden Berk,Donald G. York +18 more
TL;DR: In this article, the authors describe further results of a program aimed to yield ~10^4 fully characterized optical identifications of ROSAT X-ray sources using both optical imaging and spectroscopic data from the Sloan Digital Sky Survey.
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A high yield of new sightlines for the study of intergalactic helium: far-uv-bright quasars from the sdss, galex , and hst
David Syphers,Scott F. Anderson,Wei Zheng,Daryl Haggard,Avery Meiksin,Kuenley Chiu,Craig J. Hogan,Donald P. Schneider,Donald G. York +8 more
TL;DR: In this paper, a catalog of 200 higher-confidence (70% secure) cases of quasars at z = 2.8-5.1 potentially having surviving far-UV (rest-frame) flux is presented.
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A High Yield of New Sightlines for the Study of Intergalactic Helium: Far-UV-Bright Quasars from SDSS, GALEX, and HST
David Syphers,Scott F. Anderson,Wei Zheng,Daryl Haggard,Avery Meiksin,Kuenley Chiu,Craig J. Hogan,Donald P. Schneider,D. G. York +8 more
TL;DR: In this paper, a catalog of 200 higher-confidence cases of quasars at z = 2.8-5.1 potentially having surviving far-UV (restframe) flux is presented.
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Ten More New Sightlines for the Study of Intergalactic Helium, and Hundreds of Far-UV-Bright Quasars, from SDSS, GALEX, and HST
David Syphers,Scott F. Anderson,Wei Zheng,Daryl Haggard,Avery Meiksin,Donald P. Schneider,Donald G. York +6 more
TL;DR: In this paper, a large number of clean quasar sightlines for the Gunn-Peterson test have been obtained by cross-correlating SDSS DR7 and GALEX GR4+5.
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