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Record 90 of 4598
A study of ultraviolet absorption lines through the complete Galactic halo by the analysis of HST faint object spectrograph spectra of active Galactic nuclei, 1
External Online Source: doi:10.1086/175027
Author and Affiliation:
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)
Abstract: The 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.
Publication Date: Dec 20, 1994
Document ID:
19950043734
(Acquired Dec 28, 1995)
Accession Number: 95A75333
Subject Category: ASTRONOMY
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 1; p. p. 630-637; (ISSN 0004-637X); 437; 2
Publisher Information: United States
Contract/Grant/Task Num: NAS5-29293; NAS5-26555
Financial Sponsor: NASA; United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 8p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ACTIVE GALACTIC NUCLEI; GALACTIC HALOS; GALACTIC STRUCTURE; GAS IONIZATION; INTERSTELLAR MATTER; LINE SPECTRA; ULTRAVIOLET ABSORPTION; CARBON; HUBBLE SPACE TELESCOPE; IUE; QUASARS; RATIOS; SATELLITE-BORNE INSTRUMENTS; SILICON; SPECTROGRAPHS
Imprint And Other Notes: Astrophysical Journal, Part 1 vol. 437, no. 2 p. 630-637 December 20, 1994
Availability Source: Other Sources
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