CLASH: z ∼ 6 young galaxy candidate quintuply lensed by the frontier field cluster RXC J2248.7−4431
- Creators
- Monna, A.
- Zitrin, A.
Abstract
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).
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.Attached Files
Published - MNRAS-2014-Monna-1417-34.pdf
Submitted - 1308.6280v2.pdf
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Additional details
- Eprint ID
- 44230
- Resolver ID
- CaltechAUTHORS:20140310-144705709
- TRR 33
- Deutsche Forschungsgemeinschaft (DFG)
- GO-12065
- NASA
- NAS 5-26555
- NASA
- Danish National Research Foundation
- HST-HF-51334.01-A
- NASA Hubble Fellowship
- II/2-6
- Baden Württemberg Stiftung Internationale Spitzenforschung
- Created
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2014-03-10Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field