Physics – Optics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..415y&link_type=abstract
Astrophysical Journal, Part 1, vol. 249, Oct. 15, 1981, p. 415-421. Research supported by the Science Research Council of Engla
Physics
Optics
47
Absorption Spectra, Emission Spectra, Gravitational Lenses, Line Spectra, Quasars, Ultraviolet Spectroscopy, Astronomical Photometry, Geometrical Optics, Spectrum Analysis
Scientific paper
A new absorption-line system at z(abs) of 1.1249 has been discovered by UV spectroscopy, at 1.2 A resolution, of the two gravitationally lensed images of Q0957+561. The line system is visible as a C IV 1548-1550 A doublet in both images of Q0957+561A,B, with absorption lines having the same strengths in both images and a velocity difference of -8 + or - 11 km/sec. The absorbing cloud velocity dispersion is less than 26 km/sec. Two interpretations are given of the observed z(em)-z(abs) value: (1) that of an ejection, in which it corresponds to a velocity of 37,500 km/sec, and (2) that of the result of an intervening galaxy or intergalactic cloud, according to which it would lie at a distance of about 300 Mpc from the QSO. It is shown that the small velocity difference observed in the absorption lines in the two images strengthens the ejection hypothesis for this system. It is suggested that the discovery of multiple structure in the z(abs) 1.1249-value system will strengthen the evidence for ejection.
Boksenberg Alec
Oke Bev J.
Sargent Wallace L. W.
Young Patrick
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