A Lyman Break Galaxy Candidate at z ~ 9
A Lyman Break Galaxy Candidate at z ~ 9
复制标题
z ~ 9 处的莱曼突破星系候选者
DOI:
10.1086/589944
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发表时间:
2008
期刊:
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通讯作者:
P. McCarthy
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作者:
A. Henry;M. Malkan;J. Colbert;B. Siana;H. Teplitz;P. McCarthy
We report the discovery of a z ∼ 9 Lyman break galaxy 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 μm color and a spectral break between 3.6 and 4.5 μm. 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 we show that there is a 96% probability of z ⩾ 7. We estimate that the lower limit to the comoving number density of such galaxies at z ∼ 9 is ϕ > 3.8 × 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 IAB ∼ 29) can rule out the lower z models.
DOI:
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发表时间:
2006
期刊:
Ap.J. 637
影响因子:
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作者:
Kashikawa;N.;Yahagi;M.;Shimasaku;K.;Nagashima;M.他
通讯作者:
M.他
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