Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 728, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/728/1/L22
Keywords
cosmology: observations; galaxies: luminosity function, mass function
Categories
Funding
- NASA [NAS 5-26555, HST-GO-11702]
- Center for Cosmology and AstroParticle Physics (CCAPP) at The Ohio State University
- Hubble Fellowship Program [HST-HF-51262.01-A]
- NASA, GSFC [NAG5-12460]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [806861] Funding Source: National Science Foundation
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We report the first results from the Hubble Infrared Pure Parallel Imaging Extragalactic Survey, which utilizes the pure parallel orbits of the Hubble Space Telescope to do deep imaging along a large number of random sightlines. To date, our analysis includes 26 widely separated fields observed by the Wide Field Camera 3, which amounts to 122.8 arcmin(2) in total area. We have found three bright Y-098-dropouts, which are candidate galaxies at z greater than or similar to 7.4. One of these objects shows an indication of peculiar variability and its nature is uncertain. The other two objects are among the brightest candidate galaxies at these redshifts known to date (L > 2L*). Such very luminous objects could be the progenitors of the high-mass Lyman break galaxies observed at lower redshifts (up to z similar to 5). While our sample is still limited in size, it is much less subject to the uncertainty caused by cosmic variance than other samples because it is derived using fields along many random sightlines. We find that the existence of the brightest candidate at z approximate to 7.4 is not well explained by the current luminosity function (LF) estimates at z approximate to 8. However, its inferred surface density could be explained by the prediction from the LFs at z approximate to 7 if it belongs to the high-redshift tail of the galaxy population at z approximate to 7.
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