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We present the results of a search for z=9-10 galaxies within the first 8pointings of the Hubble Frontier Fields (HFF) (4 clusters plus 4 parallelfields) and 20 cluster fields from the CLASH survey. Combined with our previousanalysis of the Hubble Ultra-Deep field (HUDF), we have now completed a searchfor z=9-10 galaxies over ~130 sq. arcmin, across 29 HST WFC3/IR pointings. Asin our recent study of the first two HFF fields, we confine our primary searchfor high-redshift candidates in the HFF imaging to the uniformly deep (i.e.sigma_160>30 AB mag in 0.5-arcsec diameter apertures), relatively lowmagnification regions. In the CLASH fields our search was confined to uniformlydeep regions where sigma_160>28.8 AB mag. Our SED fitting analysis unveils asample of 33 galaxy candidates at z_phot>=8.4, five of which have primaryphotometric redshift solutions in the range 9.6<z_phot<11.2. By calculating ade-lensed effective volume for each candidate, the improved statistics andreduced cosmic variance provided by our new sample allows a more accuratedetermination of the UV-selected galaxy luminosity function (LF) at z~9. Ournew results strengthen our previous conclusion that the LF appears to evolvesmoothly from z=8 to z=9, an evolution which can be equally well modelled by afactor of ~2 drop in density, or a dimming of ~0.5 mag in M*. Moreover, basedon our new sample, we are able to place initial constraints on the z=10 LF,finding that the number density at M_1500 ~ -19.7 is log(phi) = -4.1(+0.2,-0.3), a factor of ~2 lower than at z=9. Finally, we use our new resultsto re-visit the issue of the decline in UV luminosity density at z>=8. Weconclude that the data continue to support a smooth decline in rho_UV over theredshift interval 6<z<10, in agreement with simple models of early galaxyevolution driven by the growth in the underlying dark matter halo massfunction.

monthly notices of the royal astronomical society

The z = 9-10 galaxy population in the Hubble Frontier Fields and CLASH  surveys: The z=9 LF and further evidence for a smooth decline in UV  luminosity at z >= 8