LYMAN BREAK GALAXIES AT z ≈ 1.8–2.8: GALEX/NUV IMAGING OF THE SUBARU DEEP FIELD
LYMAN BREAK GALAXIES AT z ≈ 1.8–2.8: GALEX/NUV IMAGING OF THE SUBARU DEEP FIELD
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z ≈ 1.8–2.8 处的莱曼断裂星系：SUBARU 深场的 GALEX/NUV 成像
DOI：
10.1088/0004-637x/697/2/1410
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Makiko Yoshida
中科院分区：
文献类型：
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作者：
C. Ly;M. Malkan;T. Treu;J. Woo;T. Currie;M. Hayashi;N. Kashikawa;K. Motohara;K. Shimasaku;Makiko Yoshida
∼8000V<；25.3候选Lyman Break星系(LBG)的光度学样本是通过结合斯巴鲁/亚素数凸轮BVRCi‘z’光学数据和斯巴鲁深场的GALEX/近紫外光成像而选定的。后续光谱分析证实，在1.5≲z≲2.7时有24个LBG。在光谱中，有12个具有Lyα发射，其静止标架的等效宽度为≈5-60？在1.5<；z<；2.7中将LBGS识别为NUV辍学的成功率为86%。静止帧UV(1700？)光度函数(LF)是由测光样本构建的，并对恒星污染和z<；1.5入侵者(下限)进行了校正。Lf值为1.7± 0.1(1.4± 0.1，有恒星污染的硬上限)，是z∼2和z∼3 LBG的1倍。考虑了三种解释，认为大幅低估低z污染或有效转化体积是不太可能的：前一种解释与93%置信度的光谱样本不一致，第二种解释不能解决差异。第三种情况是，样本的不同光度选择会产生不同的星系群，这样一些BX星系就是LBGS星系，反之亦然。这一论点得到了LBGS在所有量级的较高表面密度的支持，而两个群体的红移分布几乎相同。这项研究结合来自LBG观测的其他恒星形成率密度UV测量，表明恒星形成率密度有一个上升：从z∼5(z∼6)到z∼2增加了3-6(3-10)倍，然后下降到z∼0。这一结果，连同过去的亚毫米研究发现，它们的红移分布在z∼2处有一个峰值，表明z∼2是峰值恒星形成的时期。
A photometric sample of ∼8000 V < 25.3 candidate Lyman break galaxies (LBGs) has been selected by combining Subaru/Suprime-Cam BVRCi′z′ optical data with deep GALEX/NUV imaging of the Subaru Deep Field. Follow-up spectroscopy confirmed 24 LBGs at 1.5 ≲ z ≲ 2.7. Among the optical spectra, 12 have Lyα emission with rest-frame equivalent widths of ≈5–60 Å. The success rate for identifying LBGs as NUV-dropouts at 1.5 < z < 2.7 is 86%. The rest-frame UV (1700 Å) luminosity function (LF) is constructed from the photometric sample with corrections for stellar contamination and z < 1.5 interlopers (lower limits). The LF is 1.7 ± 0.1 (1.4 ± 0.1 with a hard upper limit on stellar contamination) times higher than those of z ∼ 2 BXs and z ∼ 3 LBGs. Three explanations were considered, and it is argued that significantly underestimating low-z contamination or effective comoving volume is unlikely: the former would be inconsistent with the spectroscopic sample at 93% confidence, and the second explanation would not resolve the discrepancy. The third scenario is that different photometric selection of the samples yields nonidentical galaxy populations, such that some BX galaxies are LBGs and vice versa. This argument is supported by a higher surface density of LBGs at all magnitudes while the redshift distribution of the two populations is nearly identical. This study, when combined with other star formation rate (SFR) density UV measurements from LBG surveys, indicates that there is a rise in the SFR density: a factor of 3–6 (3–10) increase from z ∼ 5 (z ∼ 6) to z ∼ 2, followed by a decrease to z ∼ 0. This result, along with past sub-mm studies that find a peak at z ∼ 2 in their redshift distribution, suggests that z ∼ 2 is the epoch of peak star formation.
GaBoDS：ESO 深度公共巡天中的加兴-波恩深巡 VIII 莱曼断裂星系
DOI：
10.1051/0004-6361:20065880
发表时间：
2007
期刊：
arXiv: Astrophysics
影响因子：
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作者：
Hildebrandt
通讯作者：
Hildebrandt