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CLASH: z ∼ 6 young galaxy candidate quintuply lensed by the frontier field cluster RXC J2248.7−4431

Monna, A. and Zitrin, A. (2014) CLASH: z ∼ 6 young galaxy candidate quintuply lensed by the frontier field cluster RXC J2248.7−4431. Monthly Notices of the Royal Astronomical Society, 438 (2). pp. 1417-1434. ISSN 0035-8711.

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We present a quintuply lensed z ∼ 6 candidate discovered in the field of the galaxy cluster RXC J2248.7−4431 (z ∼ 0.348) targeted within the Cluster Lensing and Supernova survey with Hubble (CLASH) and selected in the deep Hubble Space Telescope (HST) frontier fields survey. Thanks to the CLASH 16-band HST imaging, we identify the quintuply lensed z ∼ 6 candidate as an optical dropout in the inner region of the cluster, the brightest image having mag_(AB) = 24.8 ± 0.1 in the f105w filter. We perform a detailed photometric analysis to verify its high-z and lensed nature. We get as photometric redshift z_(ph) ∼ 5.9, and given the extended nature and NIR colours of the lensed images, we rule out low-z early-type and galactic star contaminants. We perform a strong lensing analysis of the cluster, using 13 families of multiple lensed images identified in the HST images. Our final best model predicts the high-z quintuply lensed system with a position accuracy of 0.8 arcsec. The magnifications of the five images are between 2.2 and 8.3, which leads to a delensed UV luminosity of L_(1600)∼0.5L^∗_(1600) at z = 6. We also estimate the UV slope from the observed NIR colours, finding a steep β = −2.89 ± 0.38. We use singular and composite stellar population SEDs to fit the photometry of the high-z candidate, and we conclude that it is a young (age <300 Myr) galaxy with mass of M ∼ 10^8 M_⊙, subsolar metallicity (Z < 0.2 Z_⊙) and low dust content (A_V ∼ 0.2–0.4).

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Zitrin, A.0000-0002-0350-4488
Additional Information:© 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2013 November 23. Received 2013 November 22; in original form 2013 August 11. First published online: December 19, 2013. This work is supported by the Transregional Collaborative Research Centre TRR 33 - The Dark Universe and the DFG cluster of excellence ‘Origin and Structure of the Universe’. The CLASH Multi-Cycle Treasury Program (GO-12065) is based on observations made with the NASA/ESA HST. The Space Telescope Science Institute is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. The Dark Cosmology Centre is funded by the DNRF. Support for AZ is provided by NASA through Hubble Fellowship grant HSTHF-51334.01-A awarded by STScI. He was also partly supported by contract research ‘Internationale Spitzenforschung II/2-6’ of the Baden Württemberg Stiftung.
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)TRR 33
NASANAS 5-26555
Danish National Research FoundationUNSPECIFIED
NASA Hubble FellowshipHST-HF-51334.01-A
Baden Württemberg Stiftung Internationale SpitzenforschungII/2-6
Subject Keywords:gravitational lensing: strong; galaxies: clusters: general; galaxies: high-redshift
Issue or Number:2
Record Number:CaltechAUTHORS:20140310-144705709
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Official Citation: A. Monna, S. Seitz, N. Greisel, T. Eichner, N. Drory, M. Postman, A. Zitrin, D. Coe, A. Halkola, S. H. Suyu, C. Grillo, P. Rosati, D. Lemze, I. Balestra, J. Snigula, L. Bradley, K. Umetsu, A. Koekemoer, U. Kuchner, L. Moustakas, M. Bartelmann, N. Benítez, R. Bouwens, T. Broadhurst, M. Donahue, H. Ford, O. Host, L. Infante, Y. Jimenez-Teja, S. Jouvel, D. Kelson, O. Lahav, E. Medezinski, P. Melchior, M. Meneghetti, J. Merten, A. Molino, J. Moustakas, M. Nonino, and W. Zheng CLASH: z ∼ 6 young galaxy candidate quintuply lensed by the frontier field cluster RXC J2248.7−4431 MNRAS (February 21, 2014) Vol. 438 1417-1434 first published online December 19, 2013 doi:10.1093/mnras/stt2284
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44230
Deposited By: Ruth Sustaita
Deposited On:10 Mar 2014 22:53
Last Modified:03 Oct 2019 06:15

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