Modeling the astronomical silicate mineralogy: On the effects of grain temperature

	Modeling the astronomical silicate mineralogy: On the effects of grain temperature
	Li, MP ; Zhao, G ; Li, AG
刊名	ASTROPHYSICAL JOURNAL
	2004-10-01
卷号	613 期号:2 页码:L145-L148
关键词	comets : individual (C/2002 V1 (NEAT) dust, extinction infrared : ISM infrared : solar system radiation mechanisms : thermal
ISSN号	0004-637X
英文摘要	The mineralogical composition of dust contains important information regarding the origin and processing of the dust and the physical, chemical, and evolutionary properties of the astrophysical environment where the dust is found. In the literature, the composition of cosmic dust is usually inferred by fitting the observed infrared (IR) emission spectrum with a sum of emission spectra calculated from various individual grain species of different sizes but assuming a single, identical temperature for them. However, we show in this work that these grains of different compositions and/or different sizes, while in thermal equilibrium with the radiation field to which the grains are exposed, achieve different temperatures. The effects of dust temperature on dust compositional studies are demonstrated by showing that the IR emission spectrum calculated from a mixture of grains emitting at different temperatures differs substantially from that of the same grain mixture but with a single, identical temperature. Therefore, the need for obtaining realistic temperatures from realistic cosmic dust analogs is a key to properly interpreting the observational IR emission spectra, e.g., the rich set of data that the Spitzer Space Telescope has been collecting.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	DIFFUSE INTERSTELLAR-MEDIUM ; HALE-BOPP ; CRYSTALLINE SILICATE ; INFRARED-EMISSION ; MICRON SPECTRA ; DUST GRAINS ; C/1995 O1 ; COMETS ; STEPS
收录类别	SCI
语种	英语
WOS记录号	WOS:000224303300016
公开日期	2012-12-22
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/7757]
专题	中国科学院紫金山天文台
作者单位	1.Chinese Acad Sci, Natl Astron Observ China, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 3.Univ Arizona, Lunar & Planetary Lab, Theoret Astrophys Program, Tucson, AZ 85721 USA 4.Univ Arizona, Steward Observ, Tucson, AZ 85721 USA 5.Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA
推荐引用方式 GB/T 7714	Li, MP,Zhao, G,Li, AG. Modeling the astronomical silicate mineralogy: On the effects of grain temperature[J]. ASTROPHYSICAL JOURNAL,2004,613(2):L145-L148.
APA	Li, MP,Zhao, G,&Li, AG.(2004).Modeling the astronomical silicate mineralogy: On the effects of grain temperature.ASTROPHYSICAL JOURNAL,613(2),L145-L148.
MLA	Li, MP,et al."Modeling the astronomical silicate mineralogy: On the effects of grain temperature".ASTROPHYSICAL JOURNAL 613.2(2004):L145-L148.