arXiv 1003.00392010-03astro-ph.CO

z~5的双透镜莱曼α发射半导体激光器

Two Lensed Lyman-alpha Emitting Galaxies at z~5

Matthew B. Bayliss, Eva Wuyts, Keren Sharon, Michael D. Gladders, Joseph F. Hennawi, Benjamin P. Koester, Hakon Dahle

备注：: 10 pages, 8 figures, emulate apj format, Accepted to ApJ
发表信息：: 2010ApJ...720.1559B
DOI：: 10.1088/0004-637X/720/2/1559

摘要：

我们对斯隆巨弧巡天（SGAS）中发现的两个强透镜$z\sim5$莱曼- $α$发射（LAE）星系进行了观测。我们确定这两个来源为$z=5.200$的SGAS J 091541 +382655和$z=4.994$的SGAS J134331+415455。我们分别测量了SGAS J 091541 +382655和SGAS J134331+415455在$(i,z)=(23.34\pm0.09,23.29\pm0.13$）mags和$(i,z)=(23.78\pm0.18,24.24^{+0.18}_{-0.16}$）mags处的AB幅度，以及在$25.3\pm4.1$ λ ~和$135.6\pm20.3$ λ ~处的莱曼- $α$发射的静止帧等效宽度。每个源强烈透镜的大规模星系团的前景，由于引力透镜的放大率恢复强透镜建模的前景透镜的潜力。我们使用放大率来计算这两个源的内在的，无透镜的莱曼- $α$和紫外连续光度，以及隐含的恒星形成率（SFR）。我们发现SGAS J 091541 +382655和SGAS J134341+415455分别是具有（L $_{Ly-α}$，L $_{UV})\leq(0.6$ L $_{Ly-α}^{*}, 2$ L $_{UV}^{*}$）和（L $_{Ly-α}$，L $_{UV})=(0.5$ L $_{Ly-α}^{*}, 0.9$ L $_{UV}^{*}$）的星系。两个源的光谱能量分布（SED）与恒星种群模型的比较产生了每个星系中年轻恒星质量的估计：我们报告了SGAS J 091531 +382655的上限M $_{stars} \leq 7.9^{+3.7}_{-2.5} \times 10^{7}$ M $_{\sun} h_{0.7}^{-1}$，以及SGAS J 134331 +415455的可行质量范围$2\times10^{8}$ M $_{\sun} h_{0.7}^{-1} <$ M $_{stars} < 6\times10^{9}$ M $_{\sun} h_{0.7}^{-1}$。

英文摘要：

We present observations of two strongly lensed $z\sim5$ Lyman-$α$ Emitting (LAE) galaxies that were discovered in the Sloan Giant Arcs Survey (SGAS). We identify the two sources as SGAS J091541+382655, at $z=5.200$, and SGAS J134331+415455 at $z=4.994$. We measure their AB magnitudes at $(i,z)=(23.34\pm0.09,23.29\pm0.13$) mags and $(i,z)=(23.78\pm0.18,24.24^{+0.18}_{-0.16}$) mags, and the rest-frame equivalent widths of the Lyman-$α$ emission at $25.3\pm4.1$Å~and $135.6\pm20.3$Å~for SGAS J091541+382655 and SGAS J134331+415455, respectively. Each source is strongly lensed by a massive galaxy cluster in the foreground, and the magnifications due to gravitational lensing are recovered from strong lens modeling of the foreground lensing potentials. We use the magnification to calculate the intrinsic, unlensed Lyman-$α$ and UV continuum luminosities for both sources, as well as the implied star formation rates (SFR). We find SGAS J091541+382655 and SGAS J134341+415455 to be galaxies with (L$_{Ly-α}$, L$_{UV})\leq(0.6$L$_{Ly-α}^{*}, 2$L$_{UV}^{*}$) and (L$_{Ly-α}$, L$_{UV})=(0.5$L$_{Ly-α}^{*}, 0.9$L$_{UV}^{*}$), respectively. Comparison of the spectral energy distributions (SEDs) of both sources against stellar population models produces estimates of the mass in young stars in each galaxy: we report an upper limit of M$_{stars} \leq 7.9^{+3.7}_{-2.5} \times 10^{7}$ M$_{\sun} h_{0.7}^{-1}$ for SGAS J091531+382655, and a range of viable masses for SGAS J134331+415455 of $2\times10^{8}$ M$_{\sun} h_{0.7}^{-1} <$ M$_{stars} < 6\times10^{9}$ M$_{\sun} h_{0.7}^{-1}$.

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英文摘要：

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