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SDSS J092455.87+021924.9: an Interesting Gravitationally Lensed Quasar from the Sloan Digital Sky Survey | | Naohisa Inada
; Robert H. Becker
; Scott Burles
; Francisco J. Castander
; Daniel Eisenstein
; Patrick B. Hall
; David E. Johnston
; Bartosz Pindor
; Gordon T. Richards
; Paul L. Schechter
; Maki Sekiguchi
; Richard L. White
; J. Brinkmann
; Joshua A. Frieman
; S.J. Kleinman
; Jurek Krzesi’nski
; Daniel C. Long
; Eric H. Neilsen
; Jr.
; Peter R. Newman
; Atsuko Nitta
; Donald P. Schneider
; S. Snedden
; Donald G. York
; | | Date: |
22 Apr 2003 | | Journal: | Astron.J. 126 (2003) 666 | | Subject: | astro-ph | | Abstract: | We report the discovery of a new gravitationally lensed quasar from the Sloan Digital Sky Survey, SDSS J092455.87+021924.9 (SDSS J0924+0219). This object was selected from among known SDSS quasars by an algorithm that was designed to select another known SDSS lensed quasar (SDSS 1226-0006A,B). Five separate components, three of which are unresolved, are identified in photometric follow-up observations obtained with the Magellan Consortium’s 6.5m Walter Baade telescope at Las Campanas Observatory. Two of the unresolved components (designated A and B) are confirmed to be quasars with z=1.524; the velocity difference is less than 100 km sec^{-1} according to spectra taken with the W. M. Keck Observatory’s Keck II telescope on Mauna Kea. A third stellar component, designated C, has the colors of a quasar with redshift similar to components A and B. The maximum separation of the point sources is 1.78". The other two sources, designated G and D, are resolved. Component G appears to be the best candidate for the lensing galaxy. Although component D is near the expected position of the fourth lensed component in a four image lens system, its properties are not consistent with being the image of a quasar at z~1.5. Nevertheless, the identical redshifts of components A and B and the presence of component C strongly suggest that this object is a gravitational lens. Our observations support the idea that a foreground object reddens the fourth lensed component and that another unmodeled effect (such as micro- or milli-lensing) demagnificates it, but we cannot rule out the possibility that SDSS0924+0219 is an example of the relatively rare class of ``three component’’ lens systems. | | Source: | arXiv, astro-ph/0304377 | | Services: | Forum | Review | PDF | Favorites | |
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