PMO OpenIR  > 分子云与恒星形成研究团组
The intriguing giant bow shocks near HH 131
Wang, M; Noumaru, J; Wang, HC; Yang, J; Chen, JS
2005-12-01
发表期刊ASTRONOMICAL JOURNAL
ISSN0004-6256
卷号130期号:6页码:2745-2756
摘要Using the High Dispersion Spectrograph (HDS) at the Subaru Telescope, echelle spectra of two giant arcs, i.e., nebulosities Cw and L associated with HH 131 in Orion are presented. Typical emission lines of Herbig-Haro (HH) objects have been detected toward nebulosity Cw with the broadband filter KV 408. With the low-dispersion spectrograph at the National Astronomical Observatories (NAO) 2.16 m telescope, spectra of nebulosities C, L, and K are obtained, which also show strong [S II] lambda 6717/lambda 6731, H alpha, and [N II] lambda 6583 emission lines. Position-velocity distributions of Cw and L are analyzed from the long-slit spectra observed with the HDS H alpha narrowband filter. The fastest radial velocity of Cw is V-r similar to -18.0 km s(-1). When the flow at L goes to the south, it slows down. The fastest radial velocity of L has been observed at -45.0 km s(-1), and the slowest value is about -18.3 km s(-1); the radial velocity gradient is about 200 km s(-1) pc(-1). The similarity of the fastest radial velocity of Cw to the slowest value of L and their positional connection indicate that they are physically associated. There is a tendency for the entire flow to become less excited and less ionized when going further to the south (i.e., from nebulosities K to L and C), where the most extended ( and presumably evolved) objects are seen. The electron densities of all the observed nebulosities are low (n(e) similar to 10(2) cm(-3)). Double-peaked kinematic signatures have been found in Cw from its [N II] lambda 6583 profiles, while the observed H alpha profiles of Cw are almost symmetric. Bow shock models appear to agree with the observed position-velocity diagrams of the [N II] spectra better than H alpha spectra, and a bow shock with its wing, apex, and postshock has been possibly revealed near Cw from the [N II] emission. With the suggestion that these arcs are HH shocks possibly ejected out of the Orion A molecular cloud by an uncertain source, their spectra show low to intermediate excitation from their diagnostic line ratios.
文章类型Article
关键词Ism : Herbig-haro Objects Ism : Individual (Hh 131) Ism : Jets And Outflows
WOS标题词Science & Technology ; Physical Sciences
学科领域Astronomy & Astrophysics
关键词[WOS]HERBIG-HARO OBJECTS ; SUPERNOVA-REMNANTS ; MOLECULAR CLOUD ; REGIONS ; FLOWS ; STARS ; ORION ; JETS ; WIND ; CORE
收录类别SCI
语种英语
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000233576800023
引用统计
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/4050
专题分子云与恒星形成研究团组
作者单位1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Natl Astron Observ Japan, Subaru Telescope, Hilo, HI 96720 USA
4.Peking Univ, Chinese Acad Sci, Beijing Astrophys Ctr, Beijing 100871, Peoples R China
5.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
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Wang, M,Noumaru, J,Wang, HC,et al. The intriguing giant bow shocks near HH 131[J]. ASTRONOMICAL JOURNAL,2005,130(6):2745-2756.
APA Wang, M,Noumaru, J,Wang, HC,Yang, J,&Chen, JS.(2005).The intriguing giant bow shocks near HH 131.ASTRONOMICAL JOURNAL,130(6),2745-2756.
MLA Wang, M,et al."The intriguing giant bow shocks near HH 131".ASTRONOMICAL JOURNAL 130.6(2005):2745-2756.
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