THE DISTANCE TO A STAR-FORMING REGION IN THE OUTER ARM OF THE GALAXY
文献类型：期刊论文
| 作者 | Hachisuka, K.1,2; Brunthaler, A.2; Menten, K. M.2; Reid, M. J.3; Hagiwara, Y.4; Mochizuki, N.5 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2009-05-10 |
| 卷号 | 696期号:2页码:1981-1986 |
| 关键词 | astrometry Galaxy: kinematics and dynamics Galaxy: structure masers stars: distances |
| 英文摘要 | We performed astrometric observations with the Very Long Baseline Army of WB89-437, an H(2)O maser source in the Outer spiral arm of the Galaxy. We measure an annual parallax of 0.167 +/- 0.006 mas, corresponding to a heliocentric distance of 6.0 +/- 0.2 kpc or a Galactocentric distance of 13.4 +/- 0.2 kpc. This value for the heliocentric distance is considerably smaller than the kinematic distance of 8.6 kpc. This confirms the presence of a faint Outer arm toward l = 135 degrees. We also measured the full space motion of the object and find a large peculiar motion of similar to 20 km s(-1) toward the Galactic center. This peculiar motion explains the large error in the kinematic distance estimate. We also find that WB89-437 has the same rotation speed as the LSR, providing more evidence for a flat rotation curve and thus the presence of dark matter in the outer Galaxy. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | MILKY-WAY-GALAXY ; 3-DIMENSIONAL DISTRIBUTION ; SOLAR CIRCLE ; IRAS SOURCES ; CO ; DISK ; ISM |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000265762700079 |
| 源URL | [http://119.78.226.72/handle/331011/19347]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Max Planck Inst Radioastron, D-53121 Bonn, Germany 3.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 4.Natl Inst Nat Sci, Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan 5.Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2298510, Japan |
| 推荐引用方式 GB/T 7714 | Hachisuka, K.,Brunthaler, A.,Menten, K. M.,et al. THE DISTANCE TO A STAR-FORMING REGION IN THE OUTER ARM OF THE GALAXY[J]. ASTROPHYSICAL JOURNAL,2009,696(2):1981-1986. |
| APA | Hachisuka, K.,Brunthaler, A.,Menten, K. M.,Reid, M. J.,Hagiwara, Y.,&Mochizuki, N..(2009).THE DISTANCE TO A STAR-FORMING REGION IN THE OUTER ARM OF THE GALAXY.ASTROPHYSICAL JOURNAL,696(2),1981-1986. |
| MLA | Hachisuka, K.,et al."THE DISTANCE TO A STAR-FORMING REGION IN THE OUTER ARM OF THE GALAXY".ASTROPHYSICAL JOURNAL 696.2(2009):1981-1986. |
入库方式： OAI收割
来源：上海天文台
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