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Young Galaxy Candidates In The Hubble Frontier Fields. III. MACS J0717.5+3745

Laporte, N; Infante, L; Iribarren, PT; Zheng, W; Molino, A; Bauer, FE; Bina, D; ... Zitrin, A; + view all (2016) Young Galaxy Candidates In The Hubble Frontier Fields. III. MACS J0717.5+3745. The Astrophysical Journal , 820 (2) p. 98. 10.3847/0004-637X/820/2/98. Green open access

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In this paper we present the results of our search for and study of $z\gtrsim 6$ galaxy candidates behind the third Frontier Fields (FFs) cluster, MACS J0717.5+3745, and its parallel field, combining data from Hubble and Spitzer. We select 39 candidates using the Lyman break technique, for which the clear non-detection in optical make the extreme mid-z interlopers hypothesis unlikely. We also take benefit from $z\gtrsim 6$ samples selected using the previous FF data sets of Abell 2744 and MACS 0416 to improve the constraints on the properties of very high redshift objects. We compute the redshift and the physical properties such emission lines properties, star formation rate, reddening, and stellar mass for all FF objects from their spectral energy distribution using templates including nebular emission lines. We study the relationship between several physical properties and confirm the trend already observed in previous surveys for evolution of star formation rate with galaxy mass and between the size and the UV luminosity of our candidates. The analysis of the evolution of the UV luminosity function with redshift seems more compatible with an evolution of density. Moreover, no robust $z\geqslant 8.5$ object is selected behind the cluster field and few $z\sim 9$ candidates have been selected in the two previous data sets from this legacy survey, suggesting a strong evolution in the number density of galaxies between $z\sim 8$ and 9. Thanks to the use of the lensing cluster, we study the evolution of the star formation rate density produced by galaxies with L > 0.03 ${L}^{\star }$, and confirm the strong decrease observed between $z\sim 8$ and 9.

Type: Article
Title: Young Galaxy Candidates In The Hubble Frontier Fields. III. MACS J0717.5+3745
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/0004-637X/820/2/98
Publisher version: http://dx.doi.org/10.3847/0004-637X/820/2/98
Language: English
Additional information: © Copyright 2017 IOP Publishing. 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 J0717.5+3745), galaxies, highredshift, gravitational lensing, strong
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/1559493
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