The J(2)-J(1) E methanol transitions for J>=12 in Orion KL

	The J(2)-J(1) E methanol transitions for J>=12 in Orion KL
	Wilson, TL ; Zeng, Q ; Huttemeister, S ; Dahmen, G
刊名	ASTRONOMY & ASTROPHYSICS
	1996-03-01
卷号	307 期号:1 页码:209-214
关键词	masers molecular data ISM, individual, Orion KL, molecules radio lines, ISM
ISSN号	0004-6361
英文摘要	The first astronomical measurements of the J(k) = 12(2) - 12(1), 14(2) - 14(1), 15(2) - 15(1), 16(2) - 16(1), and 17(2) - 17(1) transitions of E type methanol are presented. Corrections to the line rest frequencies are significant. A map of the averaged J = 15 to 17 lines shows that the emission arises from a region of 35 ''(delta) by similar to 20 ''(alpha) FWHP size, centered similar to 7 '' south, <2 '' west of the Hot Core. This is the Methanol Emission Center; the most intense CH3OH masers are 15 '' to the NW. The J greater than or equal to 12 profiles are adequately fitted with two gaussian velocity components with FWHP Delta upsilon(1/2) approximate to 0.8 km s(-1) and approximate to 3 km s(-1). For the wider component, our data give a rotational temperature of similar to 100 K. Excitation calculations indicate that the J(2) - J(1) populations are inverted; the narrow velocity component in the J = 15 to 17 transitions may be a low gain maser.
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]	SUBMILLIMETER-WAVE SPECTRUM ; MILLIMETER-WAVE ; MASERS ; GHZ ; LINES
收录类别	SCI
语种	英语
WOS记录号	WOS:A1996TZ45200027
公开日期	2013-02-05
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/8462]
专题	紫金山天文台_期刊（老文献）
作者单位	1.PURPLE MT OBSERV, NANJING 210008, PEOPLES R CHINA 2.HARVARD SMITHSONIAN CTR ASTROPHYS, CAMBRIDGE, MA 02138 USA
推荐引用方式 GB/T 7714	Wilson, TL,Zeng, Q,Huttemeister, S,et al. The J(2)-J(1) E methanol transitions for J>=12 in Orion KL[J]. ASTRONOMY & ASTROPHYSICS,1996,307(1):209-214.
APA	Wilson, TL,Zeng, Q,Huttemeister, S,&Dahmen, G.(1996).The J(2)-J(1) E methanol transitions for J>=12 in Orion KL.ASTRONOMY & ASTROPHYSICS,307(1),209-214.
MLA	Wilson, TL,et al."The J(2)-J(1) E methanol transitions for J>=12 in Orion KL".ASTRONOMY & ASTROPHYSICS 307.1(1996):209-214.