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SDSS J131339.98+515128.3: a new gravitationally lensed quasar selected based on near-infrared excess

Ofek, Eran O. and Oguri, Masamune and Jackson, Neal and Inada, Naohisa and Kayo, Issha (2007) SDSS J131339.98+515128.3: a new gravitationally lensed quasar selected based on near-infrared excess. Monthly Notices of the Royal Astronomical Society, 382 (1). pp. 412-418. ISSN 0035-8711.

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We report the discovery of a new gravitationally lensed quasar, SDSS J131339.98+515128.3, at a redshift of 1.875 with an image separation of 1.24 arcsec. The lensing galaxy is clearly detected in visible light follow-up observations. We also identify three absorption-line doublets in the spectra of the lensed quasar images, from which we measure the lens redshift to be 0.194. Like several other known lenses, the lensed quasar images have different continuum slopes. This difference is probably the result of reddening and microlensing in the lensing galaxy. The lensed quasar was selected by correlating Sloan Digital Sky Survey spectroscopic quasars with Two Micron All Sky Survey (2MASS) sources and choosing quasars that show near-infrared (near-IR) excess. The near-IR excess can originate, for example, from the contribution of the lensing galaxy at near-IR wavelengths. We show that the near-IR excess technique is indeed an efficient method to identify lensed systems from a large sample of quasars.

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Ofek, Eran O.0000-0002-6786-8774
Additional Information:© 2007 The Authors. Journal compilation © 2007 RAS. Accepted 2007 August 28. Received 2007 August 25; in original form 2007 July 22. Published Online: 26 October 2007. EOO, MO and NJ would like to thank the Kavli Institute for Theoretical Physics and the organizers of the KITP workshop 'Applications of Gravitational Lensing: Unique Insights into Galaxy Formation and Evolution' for their hospitality; this work was initiated at this KITP workshop. It is pleasure to thank the referee, Chris Kochanek, for useful comments on the manuscript. This research was supported in part by the National Science Foundation under Grant No. PHY05-51164, and also by Department of Energy contract DE-AC02-76SF00515 and by the European Community's Sixth Framework Marie Curie Research Training Network Programme contract no. MRTN-CT-2004-505183 'ANGLES'. Use of the UH 2.2-m telescope for the observations is supported by NAOJ. Based in part on data collected at Subaru telescope and obtained from the SMOKA archive, which is operated by the Astronomy Data Centre, National Astronomical Observatory of Japan. NI acknowledges support from the Special Postdoctoral Researcher Programme of RIKEN.
Funding AgencyGrant Number
Department of Energy (DOE)DEAC02-76SF00515
European CommunityMRTN-CT-2004-505183 ‘ANGLES’
Subject Keywords:gravitational lensing; quasars: individual: SDSS J131339.98+515128.3
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Record Number:CaltechAUTHORS:OFEmnras07
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13236
Deposited By: Tony Diaz
Deposited On:09 Feb 2009 22:48
Last Modified:03 Oct 2019 00:35

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