Spectroscopy of arcs in the rich cluster Abell 963

Details Spectroscopy of arcs in the rich cluster Abell 963 Spectroscopy of arcs in the rich cluster Abell 963

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..184e&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, March 1, 1991, p. 184-190. SERC-supported research

Astronomy and Astrophysics

Astronomy

22

Astronomical Spectroscopy, Galactic Clusters, Radio Galaxies, Charge Coupled Devices, Emission Spectra, Gravitational Lenses, Red Shift, Spiral Galaxies, Star Formation

Scientific paper

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 A 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 forbidden-line O II 3727 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 of 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.

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