Age and Dust Degeneracy for Starburst Galaxies Solved?
Age and Dust Degeneracy for Starburst Galaxies Solved?
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星暴星系的年龄和尘埃简并问题解决了吗？
DOI：
10.1086/307706
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
V. Vansevičius
中科院分区：
文献类型：
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作者：
T. Takagi;N. Arimoto;V. Vansevičius
我们提出了一个新建立的光谱演化模型的星系，包括恒星和尘埃的影响。将该模型应用于邻近的22个星暴星系，表明星系的远红外（FIR）光度有助于打破年龄尘埃简并。我们已经推导出了每个星暴星系的年龄和尘埃度的唯一解。由此得到的星暴年龄和光学厚度分别为10 ≤ t（Myr）≤ 500和0.5 ≤ τV ≤ 5.0。结果是强大的，几乎是独立的模型假设，如灰尘分布，消光曲线，和爆发强度。随着亚毫米波探测器灵敏度的快速增长，在不久的将来，确定红移z ≥ 3的恒星形成星系的年龄和τV应该是可能的。要准确估计莱曼破裂星系和高z星系的τV，可能需要对先前声称的哈勃时间内星星形成历史的图片进行实质性的修改。
We present a newly built spectral evolution model of galaxies that includes both stellar and dust effects. Applying the model to 22 nearby starburst galaxies shows that far-infrared (FIR) luminosity of galaxies helps to break the age-dustiness degeneracy. We have derived a unique solution of age and the dustiness for each starburst galaxy. The resulting starburst ages and optical depths are in the range 10 ≤ t (Myr) ≤ 500 and 0.5 ≤ τV ≤ 5.0, respectively. The result is robust and is almost independent of model assumptions such as dust distributions, extinction curves, and burst strengths. With the rapidly growing sensitivity of submillimeter detectors, it should become possible in the near future to determine the age and τV of star-forming galaxies at redshifts z ≃ 3 and beyond. Accurate estimates of τV for Lyman-break galaxies and high-z galaxies might require a substantial revision of the previously claimed picture of star formation history over the Hubble time.