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Spectroscopy of arcs in the rich cluster Abell 963.

Ellis, Richard and Allington-Smith, Jeremy and Smail, Ian (1991) 'Spectroscopy of arcs in the rich cluster Abell 963.', Monthly notices of the Royal Astronomical Society., 249 (1). pp. 184-190.


Spectra are presented for portions of the two arcs observed close to the dominant cD galaxy in the rich cluster Abell 963 (z = 0.206). The spectrum of the northern arc displays a strong emission line at 6600 Å which is seen along the entire arc. The feature cannot be understood unless the redshift is greater than that of the cluster, the most likely interpretation being [O II] 3727 Å at z = 0.771. The southern arc is considerably fainter and its spectrum shows no obvious features. However, new CCD photometry is consistent with a near-constant blue color ( B – R ~ 0.3) along both arcs, supporting the suggestion that they arise from the gravitationally lensed light of a background object. The optical and infrared color is consistent with a spiral galaxy undergoing strong star formation at this redshift. We discuss briefly the implication of this result, and the possible role lensing surveys may play in the study of high-redshift galaxies.

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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 1991 Royal Astronomical Society. Provided by the NASA Astrophysics Data System. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:10 November 2016
Date of first online publication:March 1991
Date first made open access:No date available

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