Formation of star clusters in the Large Magellanic cloud and Small Magellanic cloud. I. Preliminary results on cluster formation from colliding gas clouds

被引:41
作者
Bekki, K [1 ]
Beasley, MA
Forbes, DA
Couch, WJ
机构
[1] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia
[2] Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia
关键词
galaxies : interactions; galaxies : star clusters; Magellanic Clouds;
D O I
10.1086/381171
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We demonstrate that single and binary star clusters can be formed during cloud-cloud collisions triggered by the tidal interaction between the Large and Small Magellanic clouds. We run two different sets of self-consistent numerical simulations that show that compact, bound star clusters can be formed within the centers of two colliding clouds as a result of strong gaseous shocks, compression, and dissipation, provided that the clouds have moderately large relative velocities (10-60 km s(-1)). The impact parameter determines whether the two colliding clouds become a single or a binary cluster. The star formation efficiency in the colliding clouds is dependent on the initial ratio of the relative velocity of the clouds to the sound speed of the gas. Based on these results, we discuss the observed larger fraction of binary clusters, and star clusters with high ellipticity, in the Magellanic clouds.
引用
收藏
页码:730 / 737
页数:8
相关论文
共 41 条
[1]   Some constraints on the formation of globular clusters [J].
Ashman, KM ;
Zepf, SE .
ASTRONOMICAL JOURNAL, 2001, 122 (04) :1888-1895
[2]   Formation of stellar bars in a collapsing and self-gravitating two-component fluid [J].
Bekki, K .
ASTROPHYSICAL JOURNAL, 1997, 483 (02) :608-624
[3]   BINARY STAR-CLUSTERS IN THE LARGE MAGELLANIC CLOUD [J].
BHATIA, RK ;
HATZIDIMITRIOU, D .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1988, 230 (02) :215-&
[4]  
BHATIA RK, 1991, ASTRON ASTROPHYS SUP, V87, P335
[5]  
Binney J., 2008, GALACTIC DYNAMICS
[6]  
Clarke C. J., 2000, Protostars and planets 4, P151
[7]  
DACOSTA GS, 1991, IAU SYMP, P183
[8]   Final stages of N-body star cluster encounters [J].
de Oliveira, MR ;
Bica, E ;
Dottori, H .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2000, 311 (03) :589-600
[9]  
Dieball A, 1998, ASTRON ASTROPHYS, V339, P773
[10]   FORMATION AND ROTATION OF DISK GALAXIES WITH HALOES [J].
FALL, SM ;
EFSTATHIOU, G .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1980, 193 (01) :189-206