SPIFFI Observations of the Starburst SMM J14011+0252:Already Old, Fat, and Rich by z = 2.565
SPIFFI Observations of the Starburst SMM J14011+0252:Already Old, Fat, and Rich by z = 2.565
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SPIFFI 对星暴 SMM J14011 0252 的观测：z = 2.565 时已经老、胖、富了
DOI：
10.1086/420895
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Ralf Bender
中科院分区：
文献类型：
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作者：
M. Tecza;Andrew J. Baker;R. Davies;R. Genzel;M. Lehnert;F. Eisenhauer;D. Lutz;N. Nesvadba;Stella Seitz;L. Tacconi;N. Thatte;R. Abuter;Ralf Bender
利用ESO甚大望远镜上的红外微弱场成像光谱仪，我们获得了z=2.565发光亚毫米星系SMM J14011+0252的J、H和K波段积分场光谱。全局光谱揭示了这个空间分辨系统的两个组成部分中较亮的一个是强烈的星暴，对于观测到它的早期时代来说，它非常古老、巨大且富含金属。我们看到强烈的巴尔默断裂意味着连续恒星形成的时间尺度≥100 Myr，并且星云发射线比意味着大空间尺度上的超太阳氧丰度。总体而言，该系统在短短几百兆年的时间内迅速将大型重子质量转化为恒星。因此，我们的研究为越来越多的证据添加了新的论据，这些证据表明亚毫米星系比莱曼断裂星系质量更大，并且在高红移下的数量比当前星系演化半解析模型预测的数量更多。
Using the SPectrometer for Infrared Faint Field Imaging on the ESO Very Large Telescope, we have obtained J-, H-, and K-band integral field spectroscopy of the z = 2.565 luminous submillimeter galaxy SMM J14011+0252. A global spectrum reveals the brighter of this spatially resolved system's two components as an intense starburst that is remarkably old, massive, and metal-rich for the early epoch at which it is observed. We see a strong Balmer break implying a ≥100 Myr timescale for continuous star formation as well as nebular emission-line ratios implying a supersolar oxygen abundance on large spatial scales. Overall, the system is rapidly converting a large baryonic mass into stars over the course of only a few hundred megayears. Our study thus adds new arguments to the growing evidence that submillimeter galaxies are more massive than Lyman break galaxies and more numerous at high redshift than predicted by current semianalytic models of galaxy evolution.