arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0907.0213astro-ph.CO
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模拟Spoon IRS诊断图

Modelling the Spoon IRS diagnostic diagram

Michael Rowan-Robinson, Andreas Efstathiou

摘要:

我们探讨我们的模型是否为星爆,静止的恒星形成星系和活动星系核尘埃环面能够模拟与斯皮策测量的IRS光谱的全方位。由Spoon及其同事在2007年推出的9.7 μ硅酸盐光学厚度与6.2 μ PAH等效宽度的诊断图,很好地指示了星暴的年龄和光学厚度,以及活动星系核尘埃环的贡献。然而,在星暴演化的后期,年龄和光学厚度之间存在混淆,年龄和活动星系核尘埃环之间也存在混淆。模拟完整的IRS光谱和使用宽带25-850亩通量可以帮助解决这些别名。观测到的光谱能量分布需要一系列年龄的星爆,初始尘埃光学厚度范围从50-200,光学薄尘埃排放('卷云')照亮的星际辐射场的表面亮度范围,和AGN尘埃环面的视角范围。

英文摘要:

We explore whether our models for starbursts, quiescent star-forming galaxies and for AGN dust tori are able to model the full range of IRS spectra measured with Spitzer. The diagnostic plot of 9.7 mu silicate optical depth versus 6.2 mu PAH equivalent width, introduced by Spoon and coworkers in 2007, gives a good indication of the age and optical depth of a starburst, and of the contribution of an AGN dust torus. However there is aliasing between age and optical depth at later times in the evolution of a starburst, and between age and the presence of an AGN dust torus. Modeling the full IRS spectra and using broad-band 25-850 mu fluxes can help to resolve these aliases. The observed spectral energy distributions require starbursts of a range of ages with initial dust optical depth ranging from 50-200, optically thin dust emission ('cirrus') illuminated by a range of surface brightnesses of the interstellar radiation field, and AGN dust tori with a range of viewing angles.

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