A Very Large Telescope FORS2 Multislit Search for Lyα-emitting Galaxies at z ~ 6.5

A Very Large Telescope FORS2 Multislit Search for Lyα-emitting Galaxies at z ~ 6.5
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甚大望远镜 FORS2 多缝搜索 z ~ 6.5 处的 Lyα 发射星系

DOI:
10.1086/424801
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发表时间:
2004
期刊:
The Astrophysical Journal Letters
影响因子:
--
通讯作者:
M. Brodwin
M. Brodwin
中科院分区:
--
文献类型:
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作者:
K. Tran;S. Lilly;D. Crampton;M. Brodwin

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我们展示了使用 VLT/FORS2 在 9150 Å 大气窗口中对 z ~ 6.5 Lyα 发射星系进行深度光谱搜索的结果。我们的多缝+窄带滤波器调查覆盖了四个不同领域的 17.6 arcmin2 总空间面积,通量低至 5 × 10-18 ergs-1 cm-2(7 σ 检测)。我们的检测极限明显比红移处的窄带搜索更暗,也比 Hu 等人的 HCM 6A 在 z = 6.56 处的非透镜亮度更暗,因此它与红移低得多的勘测提供了更好的重叠。检测到八十个安全发射线星系。然而,基于它们在谱线附近的清晰连续谱发射或多谱线的存在,这些都不能是 z ~ 6.5 处的 Lyα 发射。我们没有发现 z ~ 6.5 Lyα 发射体的无效结果表明,L ≥ 2 × 1042 ergs-1 的 Lyα 发射体的数量密度在 z ~ 3 和 z ~ 6.5 之间下降了 ≳2。
We present results from a deep spectroscopic search in the 9150 Å atmospheric window for z ~ 6.5 Lyα-emitting galaxies using the VLT/FORS2. Our multislit+narrowband filter survey covers a total spatial area of 17.6 arcmin2 in four different fields and reaches fluxes down to 5 × 10-18 ergs s-1 cm-2 (7 σ detection). Our detection limit is significantly fainter than narrowband searches at this redshift and fainter also than the unlensed brightness of Hu et al.'s HCM 6A at z = 6.56, and thus it provides better overlap with surveys at much lower redshifts. Eighty secure emission-line galaxies are detected. However, based on their clear continuum emission shortward of the line or the presence of multiple lines, none of these can be Lyα emission at z ~ 6.5. Our null result of finding no z ~ 6.5 Lyα emitters suggests that the number density of Lyα emitters with L ≥ 2 × 1042 ergs s-1 declines by ≳2 between z ~ 3 and z ~ 6.5.
C.A.诺曼:《天体物理学杂志》。
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