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Young Galaxy Candidates in the Hubble Frontier Fields. IV. MACS J1149.5+2223

Zheng, W; Zitrin, A; Infante, L; Laporte, N; Huang, X; Moustakas, J; Ford, HC; ... Molino, A; + view all (2017) Young Galaxy Candidates in the Hubble Frontier Fields. IV. MACS J1149.5+2223. Astrophysical Journal , 836 (2) , Article 210. 10.3847/1538-4357/aa5d55. Green open access

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Abstract

We search for high-redshift dropout galaxies behind the Hubble Frontier Fields (HFF) galaxy cluster MACS J1149.5+2223, a powerful cosmic lens that has revealed a number of unique objects in its field. Using the deep images from the Hubble and Spitzer space telescopes, we find 11 galaxies at z > 7 in the MACS J1149.5+2223 cluster field, and 11 in its parallel field. The high-redshift nature of the bright z sime 9.6 galaxy MACS1149-JD, previously reported by Zheng et al., is further supported by non-detection in the extremely deep optical images from the HFF campaign. With the new photometry, the best photometric redshift solution for MACS1149-JD reduces slightly to z = 9.44 ± 0.12. The young galaxy has an estimated stellar mass of (7\pm 2)\times {10}^{8}\,{M}_{\odot }, and was formed at $z={13.2}_{-1.6}^{+1.9} when the universe was ≈300 Myr old. Data available for the first four HFF clusters have already enabled us to find faint galaxies to an intrinsic magnitude of {M}_{{UV}}\simeq -15.5, approximately a factor of 10 deeper than the parallel fields.

Type: Article
Title: Young Galaxy Candidates in the Hubble Frontier Fields. IV. MACS J1149.5+2223
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/1538-4357/aa5d55
Publisher version: http://doi.org/10.3847/1538-4357/aa5d55
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Cosmology: observations, galaxies: clusters: individual (MACS J1149.5+2223), galaxies: high red shift, gravitational lensing: strong
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1559492
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