BRIGHT GALAXIES AT HUBBLE%26apos;S REDSHIFT DETECTION FRONTIER: PRELIMINARY RESULTS AND DESIGN FROM THE REDSHIFT z similar to 9-10 BoRG PURE-PARALLEL HST SURVEY

作者：Calvi V; Trenti M; Stiavelli M; Oesch P; Bradley L D; Schmidt K B; Coe D; Brammer G; Bernard S; Bouwens R J; Carrasco D; Carollo C M; Holwerda B W; MacKenty J W; Mason C A; Shull J M; Treu T

来源：Astrophysical Journal, 2016, 817(2): 120.

DOI：10.3847/0004-637X/817/2/120

• cosmology: observations
• galaxies: evolution
• galaxies: high-redshift
• galaxies: photometry

We present the first results and design from the redshift z similar to 9-10 Brightest of the Reionizing Galaxies Hubble Space Telescope survey BoRG[z9-10], aimed at searching for intrinsically luminous unlensed galaxies during the first 700 Myr after the Big Bang. BoRG[z9-10] is the continuation of a multi-year pure-parallel near-IR and optical imaging campaign with the Wide Field Camera 3. The ongoing survey uses five filters, optimized for detecting the most distant objects and offering continuous wavelength coverage from lambda = 0.35 mu m to lambda = 1.7 mu m. We analyze the initial similar to 130 arcmin(2) of area over 28 independent lines of sight (similar to 25% of the total planned) to search for z > 7 galaxies using a combination of Lyman-break and photometric redshift selections. From an effective comoving volume of (5-25) x 10(5) Mpc(3) for magnitudes brighter than m(AB) = 26.5 - 24.0 in the H-160-band respectively, we find five galaxy candidates at z similar to 8.3-10 detected at high confidence (S/N > 8), including a source at z similar to 8.4 with m(AB) = 24.5 (S/N similar to 22), which, if confirmed, would be the brightest galaxy identified at such early times (z > 8). In addition, BoRG[z9-10] data yield four galaxies with 7.3 less than or similar to z less than or similar to 8. These new Lyman-break galaxies with m less than or similar to 26.5 are ideal targets for follow-up observations from ground and space-based observatories to help investigate the complex interplay between dark matter growth, galaxy assembly, and reionization.

• 出版日期2016-2-1