JWST/NIRCam在分子云上对H2O与CO2和CO的空间冰映射

IF 12.9 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Nature Astronomy Pub Date : 2025-03-24 DOI:10.1038/s41550-025-02511-z

Z. L. Smith, H. J. Dickinson, H. J. Fraser, M. K. McClure, J. A. Noble, A. C. A. Boogert, F. Sun, E. Egami, E. Dartois, J. Erkal, T. Shimonishi, T. L. Beck, J. B. Bergner, P. Caselli, S. B. Charnley, L. Chu, M. N. Drozdovskaya, R. Garrod, D. Harsono, S. Ioppolo, I. Jimenez-Serra, J. K. Jørgensen, G. J. Melnick, K. I. Öberg, M. E. Palumbo, Y. J. Pendleton, G. Perotti, K. M. Pontoppidan, D. Qasim, W. R. M. Rocha, J. A. Sturm, A. Taillard, R. G. Urso, E. F. van Dishoeck

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引用次数: 0

摘要

在分子云最冷的区域，碳和氧结合在冰冷的尘埃颗粒中。尽管冰在恒星和行星的形成中发挥了巨大的作用，但冰的顺序形成却很少受到限制。红外光谱探测冰的化学成分，但以前的望远镜观测到的视线不足以绘制单个云的地图。在这里，我们展示了变色龙1号分子云中心区域的H2O， CO2和CO冰的空间图，使用詹姆斯韦伯太空望远镜观察到的44条视线。柱密度的相关性比以前的工作大十倍，表明在最密集的视线中，CO冰中有额外的CO2冰形成。这种单云内的大统计抽样代表了冰测绘的一个阶跃变化，消除了对具有不同内在化学环境的云的平均。绘制地图为探索最密集地区的气体颗粒交换、雪线和化学演化打开了大门，并就冰化学对更广泛的天体物理学的影响得出结论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Cospatial ice mapping of H2O with CO2 and CO across a molecular cloud with JWST/NIRCam

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Cospatial ice mapping of H2O with CO2 and CO across a molecular cloud with JWST/NIRCam

In the coldest regions of molecular clouds, carbon and oxygen are incorporated into icy dust grains. Despite its outsized role in star and planet formation, sequential formation of ice is poorly constrained. Infrared spectroscopy probes ice chemistry, but previous telescopes observed insufficient lines of sight to map a single cloud. Here we present cospatial maps of H₂O, CO₂ and CO ice over the central region of the Chamaeleon I molecular cloud, using 44 lines of sight observed with the James Webb Space Telescope. Correlations at column densities ten times larger than previous work suggest additional CO₂ ice formation in CO ice for the densest lines of sight. This large statistical sampling within a single cloud represents a step change in ice mapping, eliminating averaging over clouds with different intrinsic chemical environments. Mapping opens the door to probing gas–grain exchanges, snow lines and chemical evolution in the densest regions and drawing conclusions on the impact of ice chemistry on wider astrophysics.

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来源期刊

Nature Astronomy Physics and Astronomy-Astronomy and Astrophysics

CiteScore

19.50

自引率

2.80%

发文量

252

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