TY - JOUR
T1 - SDSS J094604.90+183541.8
T2 - A gravitationally lensed quasar at z = 4.8
AU - McGreer, Ian D.
AU - Hall, Patrick B.
AU - Fan, Xiaohui
AU - Bian, Fuyan
AU - Inada, Naohisa
AU - Oguri, Masamune
AU - Strauss, Michael A.
AU - Schneider, Donald P.
AU - Farnsworth, Kara
PY - 2010/8
Y1 - 2010/8
N2 - We report the discovery of a gravitationally lensed quasar identified serendipitously in the Sloan Digital Sky Survey (SDSS). The object, SDSS J094604.90+183541.8, was initially targeted for spectroscopy as a luminous red galaxy, but the SDSS spectrum has the features of both a z = 0.388 galaxy and a z = 4.8 quasar. We have obtained additional imaging that resolves the system into two quasar images separated by 3'.'06 and a bright galaxy that is strongly blended with one of the quasar images. We confirm spectroscopically that the two quasar images represent a single-lensed source at z = 4.8 with a total magnification of 3.2, and we derive a model for the lensing galaxy. This is the highest redshift lensed quasar currently known. We examine the issues surrounding the selection of such an unusual object from existing data and briefly discuss implications for lensed quasar surveys.
AB - We report the discovery of a gravitationally lensed quasar identified serendipitously in the Sloan Digital Sky Survey (SDSS). The object, SDSS J094604.90+183541.8, was initially targeted for spectroscopy as a luminous red galaxy, but the SDSS spectrum has the features of both a z = 0.388 galaxy and a z = 4.8 quasar. We have obtained additional imaging that resolves the system into two quasar images separated by 3'.'06 and a bright galaxy that is strongly blended with one of the quasar images. We confirm spectroscopically that the two quasar images represent a single-lensed source at z = 4.8 with a total magnification of 3.2, and we derive a model for the lensing galaxy. This is the highest redshift lensed quasar currently known. We examine the issues surrounding the selection of such an unusual object from existing data and briefly discuss implications for lensed quasar surveys.
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U2 - 10.1088/0004-6256/140/2/370
DO - 10.1088/0004-6256/140/2/370
M3 - Article
AN - SCOPUS:78049288285
SN - 0004-6256
VL - 140
SP - 370
EP - 378
JO - Astronomical Journal
JF - Astronomical Journal
IS - 2
ER -