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Date and Time of the Query: 2019-04-25 T15:49:58 PDT
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For refcode 1991ApJ...366..405P:
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Copyright by American Astronomical Society. Reproduced by permission
1991ApJ...366..405P A STRAIGHT GRAVITATIONAL IMAGE IN ABELL 2390: A STRIKING CASE OF LENSING BY A CLUSTER OF GALAXIES ROSER PELLO, JEAN-FRANCOIS LE BORGNE, GENEVIEVE SOUCAIL, YANNICK MELLIER, AND BLAI SANAHUJA Received 1990 February 26; accepted 1990 July 9 ABSTRACT In this paper we present the results obtained on the photometry and spectroscopy of a very linear arclike object found in the center of the rich cluster of galaxies Abell 2390 (z = 0.231). The main feature in its spectrum is an emission line at 7130 A that exists all along the arc. The identification of this emission line as [O II] {lambda}3727 leads to a redshift of 0.913 for the structure. This is the third arc candidate confirmed spectroscopically as a gravitationally lensed background galaxy. We report the presence of several arclets in the neighborhood of the arc, and a faint object whose redshift and spectrum are about the same as those of the arc. We discuss the detection of a velocity gradient inside the arc. A first attempt to model the lens is also proposed, and the difficulties of reproducing a "straight arc" are emphasized. Subject headings: galaxies: clustering - gravitational lenses
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