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

DOI: 
10.3847/1538-4357/aa5d55
Publication date: 
01/02/2017
Main author: 
Zheng W.
IAA authors: 
Molino, A.
Authors: 
Zheng W., Zitrin A., Infante L., Laporte N., Huang X., Moustakas J., Ford H.C., Shu X., Wang J., Diego J.M., Bauer F.E., Iribarren P.T., Broadhurst T., Molino A.
Journal: 
Astrophysical Journal
Refereed: 
Yes
Publication type: 
Article
Volume: 
836
Pages: 
Number: 
210
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 ≃ 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 , and was formed at 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 , approximately a factor of 10 deeper than the parallel fields. © 2017. The American Astronomical Society. All rights reserved.

Database: 
SCOPUS
ADS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85014345394&doi=10.3847%2f1538-4357%2faa5d55&partnerID=40&md5=dd9de9a016d3da046ffc571c4db2f9f1
ADS Bibcode: 
2017ApJ...836..210Z
Keywords: 
cosmology: observations; galaxies: clusters: individual (MACS J1149.5+2223); galaxies: highredshift; gravitational lensing: strong