Lensed galaxies in CANDELS

Cooray, Asantha and Fu, Hai and Calanog, Jae and Wardlow, J. L. and Chiu, A. and Kim, Sam and Smidt, Joseph and Acquaviva, V. and Ferguson, H. C. and Faber, S. M. and Galametz, A. and Grogin, N. A. and Hartley, W. and Kocevski, D. and Koekemoer, A. and Koo, D. C. and Lucas, R. A. and Moustakas, L. and Newman, J. A. (2011) Lensed galaxies in CANDELS. arxiv.org. (Unpublished)

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We present results from a search for gravitationally lensed galaxies present in the Hubble Space Telescope (HST)/Wide Field Camera-3 (WFC3) images of the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). We present one bona fide lens system in UDS and two compact lens candidates in the GOODS-S field. The lensing system in UDS involves two background galaxies, one at z=1.847 lensed to an arc and a counterimage, and the second at a photometric redshift of z=2.32^{+0.10}_{-0.06} lensed to a double image. We reconstruct the lensed sources in the source plane and find in each of the two cases the sources can be separated to a pair of galaxies. The sources responsible for the arc are compact with effective radii of 0.3 to 0.4 kpc in WFC3 J_{125}-band and a total stellar mass and a star-formation rate of 2.1_{-0.4}^{+2.4} times 10^7 M_sun and 2.3_{-1.7}^{+ 0.6} M_sun yr^{-1}, respectively.The abnormally high H_{160}-band flux of this source is likely due to OIII emission lines with a rest-frame equivalent width about 700 Angstroms for OIII 5007 Angstroms. The sources responsible for the double image have corresponding values of about 0.4 to 0.5 kpc, 1.4_{-0.8}^{+1.9} times 10^9 M_sun, and 8.7_{-7.0}^{+11.1} M_sun yr^{-1}. Once completed CANDELS is expected to contain about 15 lensing systems and will allow statistical studies on both lensing mass profiles and z ~ 2 lensed galaxies.

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14 Nov 2018 09:08
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26 Nov 2020 06:03