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The gravitational lens system Q0957+561 in the ultravioletPhotometric and polarimetric observations of both images of the gravitationally lensed quasar Q0957+561 (z(sub em) = 1.41) were obtained in the UV in 1993 with the High Speed Photometer on board the Hubble Space Photometer on board the Hubble Space Telescope. The images exhibited no significant polarization in a bandpass centered on 2770 A (observer's frame); p less than or = 3.2 % (2 sigma upper limit) in each image. The ratio of the flux density in image A to that in image B in late 1993 had a constant valuee, 1.021 +/- 0.008, in four different UV bandpass between 1400 A and 3040 A observer's frame). These results are consistent with the prediction of the gravitation lens interpretation that the photometric ratio of the images measured simultaneously should be independent of frequency. Reprocessed archival spectra of the two images obtained between 1981 and 1983 by the International Ultraviolet Explorer (IUE) show that the photometric ratio of A to B varies between 0.96 and 2.0 in the Ly alpha emission line, and between 0.77 and 1.8 in the O VI lambda 1037 emission line (quasar rest frame). The photometric ratio of A to B at any single epoch is often significantly different in the two emission lines. Accepting the system as a gravitational lens implies that in the quasar the flux in the Ly alpha emsisson line can vary independently of the flux in the 0 IV emission line.
Document ID
19950054907
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dolan, J. F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Michalitsianos, A. G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Thompson, R. W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Boyd, P. T.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wolinski, K. G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bless, R. C.
(Univ. of Wisconsin, Madison, WI United States)
Nelson, M. J.
(Univ. of Wisconsin, Madison, WI United States)
Percival, J. W.
(Univ. of Wisconsin, Madison, WI United States)
Taylor, M. J.
(Univ. of Wisconsin, Madison, WI United States)
Elliot, J. L.
(Massachusetts Institute of Technology, Cambridge, MA United States)
Date Acquired
August 16, 2013
Publication Date
March 20, 1995
Publication Information
Publication: The Astrophysical Journal, Part 1
Volume: 442
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A86506
Funding Number(s)
CONTRACT_GRANT: NAS5-32484
CONTRACT_GRANT: NAG5-1613
Distribution Limits
Public
Copyright
Other

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