Discovery of A Very Bright, Strongly-Lensed z=2 Galaxy in the SDSS DR5

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We report on the discovery of a very bright z = 2.00 star-forming galaxy that is strongly lensed by a foreground z = 0.422 luminous red galaxy (LRG). This system was found in a systematic search for bright arcs lensed by LRGs and brightest cluster galaxies in the Sloan Digital Sky Survey Data Release 5 sample. Follow-up observations on the Subaru 8.2m telescope on Mauna Kea and the Astrophysical Research Consortium 3.5m telescope at Apache Point Observatory confirmed the lensing nature of this system. A simple lens model for the system, assuming a singular isothermal ellipsoid mass distribution, yields an ... continued below

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31 pages

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Lin, Huan; Buckley-Geer, Elizabeth; /Fermilab; Allam, Sahar S.; U., /Fermilab /Wyoming; Tucker, Douglas L. et al. September 30, 2008.

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We report on the discovery of a very bright z = 2.00 star-forming galaxy that is strongly lensed by a foreground z = 0.422 luminous red galaxy (LRG). This system was found in a systematic search for bright arcs lensed by LRGs and brightest cluster galaxies in the Sloan Digital Sky Survey Data Release 5 sample. Follow-up observations on the Subaru 8.2m telescope on Mauna Kea and the Astrophysical Research Consortium 3.5m telescope at Apache Point Observatory confirmed the lensing nature of this system. A simple lens model for the system, assuming a singular isothermal ellipsoid mass distribution, yields an Einstein radius of {theta}{sub Ein} = 3.82 {+-} 0.03{double_prime} or 14.8 {+-} 0.1h{sup -1} kpc at the lens redshift. The total projected mass enclosed within the Einstein radius is 2.10 {+-} 0.03 x 10{sup 12}h{sup -1}M{sub {circle_dot}}, and the magnification factor for the source galaxy is 27 {+-} 1. Combining the lens model with our gVriz photometry, we find an (unlensed) star formation rate for the source galaxy of 32 h{sup -1} M{sub {circle_dot}} hr{sup -1}, adopting a fiducial constant star formation rate model with an age of 100 Myr and E(B-V) = 0.25. With an apparent magnitude of r = 19.9, this system is among the very brightest lensed z {ge} 2 galaxies, and provides an excellent opportunity to pursue detailed studies of the physical properties of an individual high-redshift star-forming galaxy.

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31 pages

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  • Journal Name: Astrophysical Journal

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  • Report No.: SLAC-PUB-13421
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 939103
  • Archival Resource Key: ark:/67531/metadc901128

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  • September 30, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 23, 2016, 4:02 p.m.

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Lin, Huan; Buckley-Geer, Elizabeth; /Fermilab; Allam, Sahar S.; U., /Fermilab /Wyoming; Tucker, Douglas L. et al. Discovery of A Very Bright, Strongly-Lensed z=2 Galaxy in the SDSS DR5, article, September 30, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc901128/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.