Exploring the high-redshift Universe
The z=9-10 galaxy population in the Hubble Frontier Fields and CLASH surveys
Derek McLeod
Ross McLure (University of Edinburgh), James Dunlop (University of Edinburgh)
University of Edinburgh
In this talk I present the results of a search for z=9-10 galaxies within the first four cluster+parallel field data releases from the Hubble Frontier Fields (HFF) programme. Combined with our previous analysis of the HUDF, and supplemented with a search of twenty CLASH cluster fields, this search spans a total survey area of ~130 sq. arcmin, spread across 29 HST WFC3/IR pointings. By uncovering a sample of 33 galaxy candidates at photometric redshift z>8.3, we produce a more accurate determination of the UV-selected galaxy luminosity function (LF) at z=9. Our new results strengthen the conclusion of a smoothly evolving LF from z=8 to z=9, an evolution which can be equally well-modelled by a factor ~2 drop in density or a dimming of ~0.5 mag in M*. Based on our new sample, we are able to place initial constraints on the z=10 LF, finding the number density at M_1500=-19.7 is also a factor of ~2 below the equivalent number density at z=9. Finally, re-visiting the issue of the UV luminosity density evolution at 6


09:00 - 10:30
EX - LT2 (200)