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Record Details

Record 7 of 34250
The ultraviolet spectrum of the gravitational lens candidate UM 425 = QSO 1120+019: Evidence for broad absorption line (BAL) structure
External Online Source: doi:10.1086/175200
Author and Affiliation:
Michelitsianos, A. G.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Oliversen, R. J.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Abstract: The UV line profile structure of high-ionization resonance lines found with the International Ultraviolet Explorer (IUE) in the brightest of four multiply imaged sources (images-A) in the candidate gravitational lens UM 425 = QSO 1120+019 indicates broad absorption line (BAL) structure. The deep-broad trough associated with the O IV line extends to velocities approiximately -12,000 km/s, and contains disrete features that suggest multicomponent velocity structure. This structure may include contributions from C IV absorption from the early-type galaxy that is believed to lens UM 425. A strong absorption feature in the blue wing of the Lyman-alpha lambda 1216 emission line may be a Lyman alpha absorption system at a Z(sub Ly alpha) = 1.437 +/- 0.003, or it may be formed by the superposition of the broad N V lambda lambda 1238, 1242 absorption trough on the extended blue emission wing of the QSO Lyman-alpha line. We obtained a redshift of Z(sub QSO) = 1.471 +/- 0.003 from Lyman-alpha lambda 1215, consistent with the redshift found by Meylan and Djorgovski in the optical. The Lyman-alpha line appears unusally weak due to the presence of N V lambda 1240 BAL absorption. A Lyman-limit absorption system at lambda 912 was not observed in the QSO rest frame. The detection of BAL structure in the other weaker ground-state resonance lines of N II (l) and S IV (l) was not found, suggesting these lines are formed in a region that is distinct from the BAL component. Detection of BAL structure in the other fainter images in this system with Hubble Space Telescope (HST) instrumentation, similar to structure observed here in image A, could provide evidence that UM 425 is a gravitational lens.
Publication Date: Feb 01, 1995
Document ID:
19950044700
(Acquired Dec 28, 1995)
Accession Number: 95A76299
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: The Astrophysical Journal, Part 1 (ISSN 0004-637X); 439; 2; p. 599-603
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 5p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ABSORPTION SPECTRA; GRAVITATIONAL LENSES; QUASARS; ULTRAVIOLET ASTRONOMY; ULTRAVIOLET SPECTRA; CONTINUOUS SPECTRA; IUE; LINE SPECTRA; LYMAN SPECTRA; SPECTRUM ANALYSIS
Imprint And Other Notes: The Astrophysical Journal, Part 1 vol. 439, no. 2 p. 599-603 February 1, 1995
Availability Source: Other Sources
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