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On the crystallinity of silicate dust in the interstellar medium
Li, M. P.; Zhao, G.; Li, Aigen
2007-11-21
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume382Issue:1Pages:L26-L29
AbstractAn accurate knowledge of the mineralogy (chemical composition and crystal structure) of the silicate dust in the interstellar medium (ISM) is crucial for understanding its origin in evolved stars, the physical and chemical processing in the ISM, and its subsequent incorporation into protostellar nebulae, protoplanetary discs and cometary nuclei where it is subjected to further processing. While an appreciable fraction of silicate dust in evolved stars, in protoplanetary discs around pre-main-sequence stars, in debris discs around main-sequence stars and in cometary nuclei is found to be in crystalline form, very recent infrared spectroscopic studies of the dust along the sightline toward the Galactic Centre source Sgr A* placed an upper limit of similar to 1.1 per cent on the silicate crystalline fraction, well below the previous estimates of similar to 5 or similar to 60 per cent derived from the observed 10-mu m absorption profile for the local ISM toward Cyg OB2 No. 12. Since the sightline toward Sgr A* contains molecular cloud materials as revealed by the detection of the 3.1- and 6.0-mu m water ice absorption features, we argue that by taking into account the presence of ice mantles on silicate cores, the upper limit on the degree of silicate crystallinity in the ISM is increased to mu 3-5 per cent.
KeywordIsm : Clouds Ism : Lines And bAnds Dust Galaxy : Centre Extinction Infrared : Ism
DOI10.1111/j.1745-3933.2007.00382.x
Indexed BySCI
Language英语
WOS IDWOS:000250822000006
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8313
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA
Recommended Citation
GB/T 7714
Li, M. P.,Zhao, G.,Li, Aigen. On the crystallinity of silicate dust in the interstellar medium[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2007,382(1):L26-L29.
APA Li, M. P.,Zhao, G.,&Li, Aigen.(2007).On the crystallinity of silicate dust in the interstellar medium.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,382(1),L26-L29.
MLA Li, M. P.,et al."On the crystallinity of silicate dust in the interstellar medium".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 382.1(2007):L26-L29.
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