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Title:
Spectroscopic Analysis of H I Absorption-Line Systems in 40 HIRES Quasars
Authors:
Misawa, Toru; Tytler, David; Iye, Masanori; Kirkman, David; Suzuki, Nao; Lubin, Dan; Kashikawa, Nobunari
Affiliation:
AA(Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802, USA ), AB(Center for Astrophysics and Space Sciences, University of California at San Diego, MS 0424, La Jolla, CA 92093-0424, USA ; Visiting Astronomer, W. M. Keck Observatory, which is a joint facility of the University of California, the California Institute of Technology, and NASA ), AC(National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ; Department of Astronomical Science, Graduate University for Advanced Studies, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan), AD(Center for Astrophysics and Space Sciences, University of California at San Diego, MS 0424, La Jolla, CA 92093-0424, USA ; Visiting Astronomer, W. M. Keck Observatory, which is a joint facility of the University of California, the California Institute of Technology, and NASA ), AE(Center for Astrophysics and Space Sciences, University of California at San Diego, MS 0424, La Jolla, CA 92093-0424, USA ; Visiting Astronomer, W. M. Keck Observatory, which is a joint facility of the University of California, the California Institute of Technology, and NASA ), AF(Center for Astrophysics and Space Sciences, University of California at San Diego, MS 0424, La Jolla, CA 92093-0424, USA ; Visiting Astronomer, W. M. Keck Observatory, which is a joint facility of the University of California, the California Institute of Technology, and NASA ), AG(National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan ; Department of Astronomical Science, Graduate University for Advanced Studies, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan)
Publication:
The Astronomical Journal, Volume 134, Issue 4, pp. 1634 (2007). (AJ Homepage)
Publication Date:
10/2007
Origin:
IOP
DOI:
10.1086/521557
Bibliographic Code:
2007AJ....134.1634M

Abstract

We list and analyze H I absorption lines at redshifts 2 < z < 4 with column density 12 < log(N/cm-2) < 19 in 40 high-resolution (FWHM = 8.0 km s-1) quasar spectra obtained with the Keck HIRES. We deblend and fit all H I lines within 1000 km s-1 of 86 strong H I lines whose column densities are log N >= 15 cm-2. Unlike most prior studies, we use not only Lyα but also all visible higher Lyman series lines to improve the fitting accuracy. This reveals components near higher column density systems that cannot be seen in Lyα. We list the Voigt profile fits to the 1339 H I components that we found. We examined the physical properties of the H I lines after separating them into several subsamples according to their velocity separation from the quasars, redshift, column density, and S/N ratio of the spectrum. We found two interesting trends for lines with 12 < log(N/cm-2) < 15 which are within 200-1000 km s-1 of systems with log(N/cm-2) > 15. First, their column density distribution becomes steeper, meaning relatively fewer high column density lines, at z < 2.9. Second, their column density distribution also becomes steeper and their line width becomes broader by about 2-3 km s-1 when they are within 5000 km s-1 of their quasar.

The data presented here were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.

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