神秘的冰留下了冰冷的痕迹

IF 14.3 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Paul Woods
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引用次数: 0

摘要

凝固的分子物质,称为冰,通常可以在寒冷、密集的空间区域找到,比如分子云或原恒星周围的环境。2007年,AKARI卫星在一次银河系红外光谱调查中偶然发现了两个冰冷的物体。Takashi Shimonishi和他的同事们现在用ALMA进行了后续观察,发现这两个区域既没有分子云的特征,也没有年轻恒星物体(yso)的特征,这意味着它们的性质是未知的,而且可能是独一无二的。在AKARI 2.5-13µm光谱中,由于H2O、CO2和CO的存在,两种物体都具有深度吸收特征。ALMA观测到CO (J = 3-2)和SiO (J = 8-7)的致密发射线,根据CO光谱中的运动学信息,它们分别位于银河系核心臂的9.3和13.4 kpc处。两者看起来都很紧凑(100 - 1000 au),与周围的分子物质分离,但都在高视差(AV ~ 100 mag)的区域。它们的光谱能量分布在5微米左右达到峰值,对于这种被尘埃覆盖的物体来说,这是不寻常的蓝色。这两个目标都与嵌入式yso的标准光谱能量分布模型不兼容。在它们的位置上没有已知的黑暗分子云,而相邻的恒星是通过光学探测到的。红外特征也与其他潜在的冰源不相容:原行星盘,OH/IR恒星,某些类型的星系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enigmatic ice leaves cold trail
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来源期刊
Nature Astronomy
Nature Astronomy Physics and Astronomy-Astronomy and Astrophysics
CiteScore
19.50
自引率
2.80%
发文量
252
期刊介绍: Nature Astronomy, the oldest science, has played a significant role in the history of Nature. Throughout the years, pioneering discoveries such as the first quasar, exoplanet, and understanding of spiral nebulae have been reported in the journal. With the introduction of Nature Astronomy, the field now receives expanded coverage, welcoming research in astronomy, astrophysics, and planetary science. The primary objective is to encourage closer collaboration among researchers in these related areas. Similar to other journals under the Nature brand, Nature Astronomy boasts a devoted team of professional editors, ensuring fairness and rigorous peer-review processes. The journal maintains high standards in copy-editing and production, ensuring timely publication and editorial independence. In addition to original research, Nature Astronomy publishes a wide range of content, including Comments, Reviews, News and Views, Features, and Correspondence. This diverse collection covers various disciplines within astronomy and includes contributions from a diverse range of voices.
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