Journal article
The Bright-end Galaxy Candidates at z ∼ 9 from 79 Independent HST Fields
T Morishita, M Trenti, M Stiavelli, LD Bradley, D Coe, PA Oesch, CA Mason, JS Bridge, BW Holwerda, RC Livermore, B Salmon, KB Schmidt, JM Shull, T Treu
Astrophysical Journal | IOP PUBLISHING LTD | Published : 2018
Abstract
We present a full data analysis of the pure-parallel Hubble Space Telescope (HST) imaging observations in the Brightest of Reionizing Galaxies Survey (BoRG[z9]) in Cycle 22. The medium-deep exposures with five HST/WFC3IR+UVIS filter bands from 79 independent sightlines (∼370 arcmin2) provide the least biased determination of number density for z 9 bright galaxies against cosmic variance. After a strict two-step selection for candidate galaxies, including dropout color and photometric redshift analyses, and revision of previous BoRG candidates, we identify one source at z ∼ 10 and two sources at z ∼ 9. The z ∼ 10 candidate shows evidence of line-of-sight lens magnification (μ ∼ 1.5), yet it a..
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Grants
Awarded by National Aeronautics and Space Administration
Funding Acknowledgements
We thank the anonymous referee for providing constructive comments. We thank Masafumi Ishigaki for providing the data points of luminosity function in Ishigaki et al. (2018). T.M. thank Yuichi Harikane for fruitful discussion. 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. These observations are associated with programs 14701 and 13767. This research was conducted by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. C.M. acknowledges support provided by NASA through the NASA Hubble Fellowship grant HST-HF2-51413.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555.