Isolating signatures of major cloud-cloud collisions - II. The lifetimes of broad bridge features

被引:80
作者
Haworth, T. J. [1 ]
Shima, K. [2 ]
Tasker, E. J. [2 ]
Fukui, Y. [3 ]
Torii, K. [3 ]
Dale, J. E. [4 ]
Takahira, K. [2 ]
Habe, A. [2 ]
机构
[1] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
[2] Hokkaido Univ, Fac Sci, Dept Phys, Kita Ku, Sapporo, Hokkaido 0600810, Japan
[3] Nagoya Univ, Dept Phys & Astrophys, Chikusa Ku, Nagoya, Aichi 4648601, Japan
[4] Excellence Cluster Universe, D-85748 Garching, Germany
关键词
stars: formation; ISM: bubbles; ISM: clouds; ISM: kinematics and dynamics; galaxies: ISM; TRIGGERED STAR-FORMATION; GIANT MOLECULAR CLOUDS; GRAVITATIONAL-INSTABILITY; CLUSTER FORMATION; MASSIVE CLUSTERS; INTERSTELLAR; LINE; WINDS; EVOLUTION; EXPANSION;
D O I
10.1093/mnras/stv2068
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate the longevity of broad bridge features in position-velocity diagrams that appear as a result of cloud-cloud collisions. Broad bridges will have a finite lifetime due to the action of feedback, conversion of gas into stars and the time-scale of the collision. We make a series of analytic arguments with which to estimate these lifetimes. Our simple analytic arguments suggest that for collisions between clouds larger than R similar to 10 pc the lifetime of the broad bridge is more likely to be determined by the lifetime of the collision rather than the radiative or wind feedback disruption time-scale. However, for smaller clouds feedback becomes much more effective. This is because the radiative feedback time-scale scales with the ionizing flux Nly as (RNly)-N-7/4-(1/4) so a reduction in cloud size requires a relatively large decrease in ionizing photons to maintain a given time-scale. We find that our analytic arguments are consistent with new synthetic observations of numerical simulations of cloud-cloud collisions (including star formation and radiative feedback). We also argue that if the number of observable broad bridges remains similar to constant, then the disruption time-scale must be roughly equivalent to the collision rate. If this is the case, our analytic arguments also provide collision rate estimates, which we find are readily consistent with previous theoretical models at the scales they consider (clouds larger than about 10 pc) but are much higher for smaller clouds.
引用
收藏
页码:1634 / 1643
页数:10
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