Journal
ASTROPHYSICAL JOURNAL
Volume 820, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/0004-637X/820/2/98
Keywords
cosmology: observations; galaxies: clusters: individual (MACS. J0717.5+3745); galaxies: high-redshift; gravitational lensing: strong
Categories
Funding
- CONICYT-Chile [Basal-CATA PFB-06/2007]
- Gemini-CONICYT [32120003]
- EMBIGGEN [Anillo ACT1101]
- FONDECYT [1141218, 3160122, 3140542]
- Millennium Institute of Astrophysics (MAS) of the Iniciativa Cientifica Milenio del Ministerio de Economia, Fomento y Turismo [IC120009]
- French Agence Nationale de la Recherche [ANR-09-BLAN-0234]
- Brazilian funding agency FAPESP [2014/11806-9]
- Space Telescope Science Institute (STScI) [AR-13279]
- NASA [NAS 5-26555]
- Smithsonian Astrophysical Observatory Telescope Data Center
- Russian Federation [MD-7355.2015.2]
- Russian Foundation for Basic Research [15-32-21062, 15-52-15050]
- HST Frontier Fields program
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In this paper we present the results of our search for and study of z >= 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 >= 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 >= 8.5 object is selected behind the cluster field and few z similar to 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 similar to 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 similar to 8 and 9.
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