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首页> 外文期刊>The Astrophysical journal >DUST EXTINCTION OF GAMMA-RAY BURST HOST GALAXIES: IDENTIFICATION OF TWO CLASSES?
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DUST EXTINCTION OF GAMMA-RAY BURST HOST GALAXIES: IDENTIFICATION OF TWO CLASSES?

机译：伽马射线暴寄宿星系的除尘：鉴定两类？

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摘要

Dust in the host galaxies of gamma-ray bursts (GRBs) dims and reddens their afterglow spectra. Knowledge of the nature of this dust is crucial for correcting for extinction, providing clues to the nature of GRB progenitors, and probing the interstellar medium of high-redshift galaxies as well as the nature of cosmic dust when the universe was much younger and galaxies were much less evolved. The dust and extinction properties of GRB host galaxies are still poorly known. Unlike previous work, we derive in this Letter the extinction curves for 10 GRB host galaxies without a priori assumption of any specific extinction types (such as those of the Milky Way or Small/Large Magellanic Clouds). It is found that there appear to exist two different types of extinction curves: one is relatively flat and gray, and the other displays a steeper dependence on inverse wavelength, closely resembling that of the Milky Way but with the 2175 A feature removed.
机译：伽马射线爆发（GRB）的宿主星系中的尘埃使余辉光谱变暗并变红。了解这种尘埃的性质对于纠正灭绝，提供GRB祖先的性质，探测高红移星系的星际介质以及宇宙年轻得多且星系存在时宇宙尘埃的性质至关重要。远没有发展。 GRB宿主星系的尘埃和消光特性仍然知之甚少。与以前的工作不同，我们在本信中得出了10个GRB宿主星系的灭绝曲线，而没有先验假设任何特定的灭绝类型（例如银河系或小/大麦哲伦星系）。发现存在两种不同的消光曲线：一种消光曲线相对平坦且呈灰色，另一种消光曲线对逆波长的依赖性更强，与银河系非常相似，但去除了2175 A功能。

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