TRIGGERED STAR FORMATION

被引:50
作者
Elmegreen, B. G. [1 ]
机构
[1] IBM TJ Watson Res Ctr, Yorktown Hts, NY 10598 USA
来源
EES2010: STAR FORMATION IN THE LOCAL UNIVERSE | 2011年 / 51卷
关键词
LARGE-MAGELLANIC-CLOUD; BRIGHT-RIMMED CLOUDS; MASSIVE-STAR; DYNAMICAL EXPANSION; DISSOCIATION FRONT; MOLECULAR CLOUDS; INTERSTELLAR GAS; EAGLE NEBULA; HII-REGIONS; IONIZATION;
D O I
10.1051/eas/1151004
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Triggered star formation in bright rims and shells is reviewed. Shells are commonly observed in the Milky Way and other galaxies, but most diffuse shells seen in HI or the infrared do not have obvious triggered star formation. Dense molecular shells and pillars around HIT regions often do have such triggering, although sometimes it is difficult to see what is triggered and what stars formed in the gas before the pressure disturbances. Pillar regions without clear age gradients could have their stars scattered by the gravity of the heads. Criteria and timescales for triggering are reviewed. The insensitivity of the average star formation rate in a galaxy to anything but the molecular mass suggests that triggering is one of many processes that lead to gravitational collapse and star formation.
引用
收藏
页码:45 / 58
页数:14
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