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

Creators: Zheng, Wei; Zitrin, Adi; Infante, Leopoldo; Laporte, Nicolas; Huang, Xingxing; Moustakas, John; Ford, Holland C.; Shu, Xinwen; Wang, Junxian; Diego, Jose M.; Bauer, Franz E.; Troncoso Iribarren, Paulina; Broadhurst, Tom; Molino, Alberto

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 (7 ± 2) x 10^8 M_☉, 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) ≃ -15.5, approximately a factor of 10 deeper than the parallel fields.

Additional Information

© 2017 American Astronomical Society. Received 2016 September 6. Accepted 2017 January 29. Published 2017 February 23. The work presented in this paper is based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. It is also based on data obtained with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. This work utilizes gravitational lensing models produced by the teams led by Bradač, Ishigaki, Kneib & Natarajan, Sharon, Williams, Merten & Zitrin, respectively. Support for A.Z. is provided by NASA through Hubble Fellowship grant HST-HF-51334.01-A awarded by STScI. N.L. acknowledges support from a European Research Council Advanced Grant FP7/669253. L.I., N.L., F.E.B. and P.T.I. are in part supported by CONICYT-Chile grants Basal-CATA PFB-06/2007, 3140542 and Conicyt-PIA-ACT 1417. F.E.B. also thanks CONICYT-Chile grant FONDECYT Regular 1141218 and the Ministry of Economy, Development, and Tourism's Millennium Science Initiative through grant IC120009, awarded to The Millennium Institute of Astrophysics, MAS. J.M.D. acknowledges support of the consolider projects CSD2010-00064, AYA2012-39475-C02-01 and AYA2015-64508-P (MINECO/FEDER, UE). A.M. acknowledges the financial support of the Brazilian funding agency FAPESP (Post-doc fellowship 2014/11806-9). X.X.H. and J.X.W. acknowledge support from the National Science Foundation of China (grants 11233002,11421303) and the CAS Frontier Science Key Research Program (QYZDJ-SSWSLH006).

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