Abstract / Description of output
We present the results of a search for z = 9-10 galaxies within the
first eight pointings of the Hubble Frontier Fields (HFF) survey and 20
cluster fields from the Cluster Lensing And Supernova survey with Hubble
(CLASH) survey. Combined with our previous analysis of the Hubble Ultra
Deep Field, we have now completed a search for z = 9-10 galaxies over
≃ 130 arcmin2, spread across 29 Hubble Space Telescope
Wide Field Camera 3/IR pointings. We confine our primary search for
high-redshift candidates in this imaging to the uniformly deep,
relatively low magnification regions (i.e. σ160 > 30
AB mag for HFF and σ160 > 28.8 AB mag for CLASH in
0.5-arcsec apertures). We unveil a sample of 33 galaxy candidates at
zphot ≥ 8.4, five of which have primary photometric
redshift solutions in the range 9.6 <zphot <11.2. The
improved statistics and reduced cosmic variance provided by our new
sample allows a more accurate determination of the ultraviolet
(UV)-selected galaxy luminosity function (LF) at z ≃ 9. Our new
results strengthen our previous conclusion that the LF appears to evolve
smoothly from z = 8 to 9, an evolution which can be equally well
modelled by a factor of ≃ 2 drop in density, or a dimming of ≃
0.5 mag in M⋆. Moreover, we are able to place initial
constraints on the z = 10 LF, finding that the number density at
M1500 ≃ -19.7 is log (φ ) = -4.1^{+0.2}_{-0.3}, a
factor of ≃ 2 lower than at z = 9. Finally, we use our new results
to revisit the issue of the decline in UV luminosity density
(ρUV) at z ≥ 8. We conclude that the data continue to
support a smooth decline in ρUV over the redshift
interval 6 <z <10, in agreement with simple models of early
galaxy evolution driven by the growth in the underlying dark matter halo
mass function.
Original language | English |
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Pages (from-to) | 3812-3824 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 459 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Jul 2016 |
Keywords / Materials (for Non-textual outputs)
- galaxies: evolution
- galaxies: formation
- galaxies: high-redshift
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James Dunlop
- School of Physics and Astronomy - Professor of Extragalactic Astronomy and Head of School
Person: Academic: Research Active