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A study of ultraviolet absorption lines through the complete Galactic halo by the analysis of HST faint object spectrograph spectra of active Galactic nuclei, 1The ultraviolet (1150 - 2850 A) spectra of a number of active galactic nuclei (AGNs) observed with the Hubble Space Telescope (HST) Faint Object Spectrograph (FOS) have been used to study the properties of the Galactic halo. The objects that served as probes are 3C 273, PKS 0454-220, Pg 1211+143, CSO 251, Ton 951, and PG 1351+640. The equivalent widths of certain interstellar ions have been measured, with special attention paid to the C IV/C II and Si IV/Si II ratios. These ratios have been intercompared, and the highest values are found in the direction of 3C 273, where C IV/C II = 1.2 and Si IV/Si II greater than 1. These high ratios may be due to a nearby supernova remnant, rather than to ionized gas higher up in the Galactic halo. Our data give some support to the notion that QSO metal-line systems may arise from intervening galaxies which contain high supernova rates, galactic fountains, and turbulent mixing layers.
Document ID
19950043734
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Burks, Geoffrey S.
(Colorado Univ. Boulder, CO, United States)
Bartko, Frank
(Colorado Univ. Boulder, CO, United States)
Shull, J. Michael
(Colorado Univ. Boulder, CO, United States)
Stocke, John T.
(Colorado Univ. Boulder, CO, United States)
Sachs, Elise R.
(Colorado Univ. Boulder, CO, United States)
Burbidge, E. Margaret
(California Univ. San Diego, La Jolla, CA, United States)
Cohen, Ross D.
(California Univ. San Diego, La Jolla, CA, United States)
Junkkarinen, Vesa T.
(California Univ. San Diego, La Jolla, CA, United States)
Harms, Richard J.
(Applied Research Corp. Landover, MD, United States)
Massa, Derck
(Applied Research Corp. Landover, MD, United States)
Date Acquired
August 16, 2013
Publication Date
December 20, 1994
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 437
Issue: 2
ISSN: 0004-637X
Subject Category
Astronomy
Accession Number
95A75333
Funding Number(s)
CONTRACT_GRANT: NAS5-26555
CONTRACT_GRANT: NAS5-29293
Distribution Limits
Public
Copyright
Other

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