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Progress in Optical Studies on Parsec-scale Herbig-Haro Flows
Wang Min
Source PublicationProgress in Astronomy
Other Abstract近期大视场CCD成像观测表明,由年轻星激发的部分赫比格-哈罗(HH)天体的尺度范围超过1 pc,比过去认识的HH天体的尺度大了一个量级。目前的观测已经发现pc尺度的HH天体有数十个,表明HH天体达到pc尺度是很普遍的,这将深刻地改变人们对年轻星与其周围环境作用的认识。综合评述了pc尺度HH天体的观测性质,讨论了巨HH天体对恒星形成的重大意义及其对周围星际介质的物理和化学影响。Recent observations demonstrate that outflows traced by Herbig-Haro (HH) objects can extend for parsecs from their driving sources, at least an order of magnitude larger than previous work. Some well-known HH objects such as HH 34 and HH 111 are verified to be parsec-scale HH flows. Up to now, dozens of giant HH flows have been reported in the Orion, Taurus, Cepheus and Perseus molecular cloud complexes. It thus appears that it is common for HH flows to attain parsec-scale dimensions. The ubiquity of parsec-scale HH flows profoundly alters our view of the impact of young stars on their environment. They provide a fossil record of the outflow behavior and mass loss rate from a young star over a significant fraction of the 10~5 year outflow phase, and provide indirect clues to the accretion history of the forming star. Many parsec-scale HH outflows with multiple internal working surfaces and S-shaped point symmetry about the central sources show evidence for variability of ejection velocity and orientation of the source jets. Giant HH flows with longer or comparable lengthes to associated CO outflows, imply that HH flows power CO flows. Giant HH flows are capable of heating, ionizing, and dissociating cloud material over parsec scale distances and may play a role in the chemical rejuvenation of clouds and the generation of the turbulent motions observed in molecular clouds as well as the self-regulation of star formation.
Subject AreaAstronomy & Astrophysics
Document Type期刊论文
Recommended Citation
GB/T 7714
Wang Min. Progress in Optical Studies on Parsec-scale Herbig-Haro Flows[J]. Progress in Astronomy,2002,20(1):59—73.
APA Wang Min.(2002).Progress in Optical Studies on Parsec-scale Herbig-Haro Flows.Progress in Astronomy,20(1),59—73.
MLA Wang Min."Progress in Optical Studies on Parsec-scale Herbig-Haro Flows".Progress in Astronomy 20.1(2002):59—73.
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