Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Lyman Break Galaxy Candidate at z~9   We report the discovery of a z~9 Lyman Break Galaxy (LBG) candidate, selected
from the NICMOS Parallel Imaging Survey as a J-dropout with J110 - H160 = 1.7.
Spitzer/IRAC photometry reveals that the galaxy has a blue H160 - 3.6 um color,
and a spectral break between 3.6 and 4.5 um. We interpret this break as the
Balmer break, and derive a best-fit photometric redshift of z~9. We use Monte
Carlo simulations to test the significance of this photometric redshift, and
show a 96% probability of z>7. We estimate a lower limit to the comoving number
density of such galaxies at z~9 of phi > 3.8 x 10^{-6} Mpc^{-3}. If the high
redshift of this galaxy is confirmed, this will indicate that the luminous end
of the rest-frame UV luminosity function has not evolved substantially from z~
9 to z~3. Still, some small degeneracy remains between this z~9 model and
models at z~2-3; deep optical imaging (reaching I ~ 29 AB) can rule out the
lower-z models.

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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph