Key points are not available for this paper at this time.
We searched for z7 Lyman-break galaxies in the optical-to-mid-infrared Hubble Frontier Field and associated parallel field observations of the strong-lensing cluster MACS J0416-2403. We discovered 22 candidates, of which 6 lie at z9 and 1 lies at z10. Based on the Hubble and Spitzer photometry, all have secure photometric redshifts and a negligible probability of being at lower redshifts according to their peak-probability ratios, . This substantial increase in the number of known high-redshift galaxies allows a solid determination of the luminosity function (LF) at z8. The number of high-z candidates in the parallel field is considerably higher than that in the Abell 2744 parallel field. Our candidates have median stellar masses of * ~-+ M log 8.44 0.31 0.55 ( ) M e , star formation rates (SFRs) of ~-+ 1.8 0.4 0.5 M e yr -1 , and SFR-weighted ages of - + 300 Myr 140 70
Infante et al. (Wed,) studied this question.