Journal article
HST Follow-up Observations of Two Bright z ∼ 8 Candidate Galaxies from the BoRG Pure-parallel Survey
RC Livermore, M Trenti, LD Bradley, SR Bernard, BW Holwerda, CA Mason, T Treu
Astrophysical Journal Letters | IOP PUBLISHING LTD | Published : 2018
Abstract
We present follow-up imaging of two bright (L > L∗) galaxy candidates at z ≳ 8 from the Brightest of Reionizing Galaxies (BoRG) survey with the F098M filter on the Hubble Space Telescope/Wide Field Camera 3 (HST/WFC3). The F098M filter provides an additional constraint on the flux blueward of the spectral break, and the observations are designed to discriminate between low- and high-z photometric redshift solutions for these galaxies. Our results confirm one galaxy, BoRG-0116+1425-747, as a highly probable z ∼ 8 source, but reveal that BoRG-0116+1425-630 - previously the brightest known z > 8 candidate (m AB = 24.5) - is likely to be a z ∼ 2 interloper. As this source was substantially brigh..
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Grants
Awarded by National Aeronautics and Space Administration
Funding Acknowledgements
The authors would like to thank the anonymous referee for helpful comments that clarified the text of this Letter. This work is based on observations made with the NASA/ESA Hubble Space Telescope, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. We acknowledge support by NASA through grant HST-GO-14701. Parts of this research were supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. R.C.L. acknowledges support from an Australian Research Council Discovery Early Career Researcher Award (DE180101240).