Very Luminous Galaxy Population at z > 7 as Revealed by HIPPIES

Details Very Luminous Galaxy Population at z > 7 as Revealed by HIPPIES Very Luminous Galaxy Population at z > 7 as Revealed by HIPPIES

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21912904y&link_type=abstract

American Astronomical Society, AAS Meeting #219, #129.04

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the new results from the Hubble Infrared Pure Parallel Imaging Extragalactic Survey (HIPPIES), which utilizes HST pure parallel orbits to do deep, multi-band optical/IR imaging along a large number of random sightlines. One of the key goals of HIPPIES is to search for the most luminous candidate galaxies at z > 7 and to address the very bright-end of the luminosity function at these redshifts using a sample that is the least affected by "cosmic variance". Our initial results have been reported in Yan et al. (2011) and at the 217th AAS meeting. Here we report the progress of our program, which includes (1) the additional, bright Y098-dropouts discovered in the Cycle-17 data that we have acquired after 2011 January, and (2) the new, similarly bright Y105-dropouts found in the Cycle-18 data. We do NOT confirm the z 8 overdensity that recently claimed by Trenti et al. (2011), who have used the same Cycle-17 data. However, we report possible overdensities found in different fields, and stress that the results based on a limited number of contiguous fields (albeit large) could be severely affected by the "cosmic variance". The authors acknowledge the support of NASA grants HST-GO-11702.* and HST-GO-12286.*.

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