EVIDENCE FOR A ROTATING HELICAL FILAMENT IN L1641, PART OF THE ORION CLOUD COMPLEX

被引:27
作者
UCHIDA, Y
FUKUI, Y
MINOSHIMA, Y
MIZUNO, A
IWATA, T
TAKABA, H
机构
[1] NAGOYA UNIV,DEPT ASTROPHYS,CHIKUSA KU,NAGOYA 46401,JAPAN
[2] COMMUN RES LABS,KASHIMA,IBARAKI 314,JAPAN
关键词
D O I
10.1038/349140a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Interstellar cloud structures, typically 10-30 pc long and 3-5 pc wide, are often seen extending outwards from dense clouds that show marked enhancement of star formation within them. We have used the Nagoya 4-m radiotelescope to study one such 'streamer', L1641, a part of the giant molecular-cloud complex in Orion, lying south of the Kleinmann-Low (KL) nebula. Using the 110-GHz line of CO-13 (J = 1-0), we have obtained intensity and velocity data, and find within the streamer a dense filament with a helical structure, spinning in the same sense as the gas in the Orion KL region. We propose a model for this structure in which the streamer, through the action of the interstellar magnetic field, acts as an angular-momentum drain on the Orion KL region, allowing it to collapse. In this model, the approximately 30-pc-long streamer is essential to the formation of the cloud, as well as the formation of stars within the dense cloud.
引用
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页码:140 / 142
页数:3
相关论文
共 10 条
[1]  
BALLY J, 1989, LOW MASS STAR FORMAT, P1
[2]  
FUKUIY, 1989, NATURE, V342, P161
[3]  
HABE A, UNPUB
[4]  
Heiles C., 1987, PHYSICAL PROCESSES I, P429
[5]  
MOUCHOVIAS T, 1985, ASTROPHYS J, V298, P205
[6]   A 110 GHZ SIS RECEIVER FOR RADIO ASTRONOMY [J].
OGAWA, H ;
MIZUNO, A ;
HOKO, H ;
ISHIKAWA, H ;
FUKUI, Y .
INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES, 1990, 11 (06) :717-726
[7]  
UCHIDA Y, 1985, PUBL ASTRON SOC JPN, V37, P515
[8]  
UCHIDA Y, 1989, LOW MASS STAR FORMAT, P141
[9]  
UCHIDA Y, 1990, PUBLS ASTR SOC JAPAN, V42, P96
[10]   OPTICAL POLARIZATION MEASUREMENTS IN THE VICINITY OF NEARBY STAR-FORMING COMPLEXES .1. THE LYNDS-1641 GIANT MOLECULAR CLOUD [J].
VRBA, FJ ;
STROM, SE ;
STROM, KM .
ASTRONOMICAL JOURNAL, 1988, 96 (02) :680-&