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首页> 外文期刊>The Astrophysical journal >OPTICAL-IR SPECTRAL ENERGY DISTRIBUTION OF THE PROTOGALAXY CANDIDATE MS 1512-cB58
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OPTICAL-IR SPECTRAL ENERGY DISTRIBUTION OF THE PROTOGALAXY CANDIDATE MS 1512-cB58

机译：原型原银候选酸盐MS 1512-cB58的光学-红外光谱能量分布

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摘要

The spectral energy distribution of the protogalaxy candidate MS 1512-cB58 at z = 2.72 is presented. Photometry in seven bands ranging from g to K′ (1300-6000 A rest wavelength) are fitted with population synthesis models. The data confirm a very young age for this galaxy in agreement with ages estimated from preliminary C IV λ1550 P Cygni profile modeling. Single-burst models with ages greater than about 20 Myr can be discarded at the 99% confidence level, and continuous star formation models with ages greater than about 35 Myr can be discarded at the 95% confidence level. The spectral energy distribution is most consistent with a continuous star formation model of about 10-20 Myr, with reddening of E(B - V) ～ 0.3. No evidence for an older population of stars is seen, but the possibility of an older population with as much as 90% of the galaxy mass cannot be ruled out. We discuss the possible ramifications of a nonstandard IMF and gravitational lensing on the galaxy's age and mass.
机译：给出了z = 2.72时的原星系候选MS 1512-cB58的光谱能量分布。人口合成模型拟合了从g到K'的七个波段（剩余波长1300-6000 A）中的光度法。数据证实了该星系非常年轻的年龄，与根据初步C IVλ1550P Cygni轮廓模型估算的年龄相吻合。可以在99％的置信度下丢弃年龄大于20 Myr的单爆发模型，而在95％的置信度下可以丢弃年龄大于35 Myr的连续恒星形成模型。光谱能量分布与约10-20 Myr的连续恒星形成模型最一致，E（B-V）变红〜0.3。没有证据表明有较大数量的恒星，但是不能排除具有90％的银河系质量的较高年龄的可能性。我们讨论了非标准IMF的可能后果和重力透镜对星系的年龄和质量的影响。

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