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Title:
Far Ultraviolet Spectroscopic Explorer Observations of the Galactic and Intergalactic Medium toward H1821+643
Authors:
Oegerle, W. R.; Tripp, T. M.; Sembach, K. R.; Jenkins, E. B.; Bowen, D. V.; Cowie, L. L.; Green, R. F.; Kruk, J. W.; Savage, B. D.; Shull, J. M.; York, D. G.
Affiliation:
AA(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218), AB(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544), AC(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218), AD(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544), AE(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544), AF(Institute for Astronomy, University of Hawaii, Honolulu, HI 96822), AG(Kitt Peak National Observatory, NOAO, P.O. Box 26732, 950 North Cherry Avenue, Tucson, AZ 85726), AH(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218), AI(Department of Astronomy, Washburn Observatory, University of Wisconsin, Madison, WI 53706), AJ(Center for Astrophysics and Space Astronomy and JILA, Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80309), AK(Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637)
Publication:
The Astrophysical Journal, Volume 538, Issue 1, pp. L23-L26. (ApJL Homepage)
Publication Date:
07/2000
Origin:
UCP
ApJ Keywords:
Galaxy: Halo, Galaxies: Intergalactic Medium, ISM: General, Galaxies: Quasars: Absorption Lines
DOI:
10.1086/312798
Bibliographic Code:
2000ApJ...538L..23O

Abstract

We have obtained moderate-resolution spectra of the bright QSO H1821+643 (z=0.297) in the wavelength interval 990-1185 Å with the Far Ultraviolet Spectroscopic Explorer (FUSE). Strong, complex O VI λ1032 and Fe II λ1145 absorption arising in gas above several spiral arms and the outer warp of our Galaxy is detected. We have identified absorption by a high negative-velocity (-215 km s-1) component of O VI, which corresponds to the limiting velocity of vLSR~-190+/-20 km s-1 for Milky Way gas along this line of sight, assuming corotation of disk and halo gas and a flat rotation curve for the outer Galaxy. We report the detection of four absorbers in the intergalactic medium, through detections of Lyβ at z=0.02438 and 0.1213, Lyδ, Lyɛ, Lyζ in a system at z=0.2249, C III λ977 at z=0.1705, and O VI λ1032 at z=0.12137. The FUSE data show that the Lyman absorbers at z=0.225 are composed of two components separated by ~70 km s-1. Finally, we have observed associated absorption from O III λ832, O IV λ787, and possibly S V λ786 at the redshift of the QSO (z~0.297). Ne VIII λλ770, 780 is not detected in this associated system. When combined with the previous detection of associated O VI λ1032, we conclude that this system is a multiphase absorber, and we discuss the origin of the absorption in this context.
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