East Asian VLBI Network astrometry toward the extreme outer Galaxy: Kinematic distance with the proper motion of G034.84-00.95
文献类型：期刊论文
| 作者 | Sakai, Nobuyuki10,11; Zhang, Bo9; Xu, Shuangjing9,11; Sakai, Daisuke7,8; Tamura, Yoshiaki8; Jike, Takaaki8; Jung, Taehyun11; Oh, Chungsik11; Kim, Jeong-Sook6; Kawaguchi, Noriyuki5 |
| 刊名 | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
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| 出版日期 | 2022-12-16 |
| 页码 | 17 |
| ISSN号 | 0004-6264 |
| 关键词 | Galaxy: disk Galaxy: kinematics and dynamics instrumentation: interferometers masers proper motions |
| DOI | 10.1093/pasj/psac102 |
| 通讯作者 | Sakai, Nobuyuki(nobuyuki@narit.or.th) |
| 英文摘要 | We aim to reveal the structure and kinematics of the Outer Scutum-Centaurus (OSC) arm located on the far side of the Milky Way through very long baseline interferometry (VLBI) astrometry using KaVA, which is composed of KVN (the Korean VLBI Network) and VERA (VLBI Exploration of Radio Astrometry). We report the proper motion of a 22 GHz H2O maser source, which is associated with the star-forming region G034.84-00.95, to be (mu(alpha)cos delta, mu(delta)) = (-1.61 & PLUSMN; 0.18, -4.29 & PLUSMN; 0.16) mas yr(-1) in equatorial coordinates (J2000.0). We estimate the 2D kinematic distance to the source to be 18.6 & PLUSMN; 1.0 kpc, which is derived from the variance weighted average of kinematic distances with local standard of rest velocity and the galactic-longitude component of the measured proper motion. Our result places the source in the OSC arm and implies that G034.84-00.95 is moving away from the Galactic plane with a vertical velocity of -38 & PLUSMN; 16 km s(-1). Since the H i supershell GS033+06-49 is located at a kinematic distance roughly equal to that of G034.84-00.95, it is expected that gas circulation occurs between the outer Galactic disk around G034.84-00.95 with a Galactocentric distance of $12.8<^>{+1.0}_{-0.9}\:$kpc and the halo. We evaluate possible origins of the fast vertical motion of G034.84-00.95, which are (1) supernova explosions and (2) cloud collisions with the Galactic disk. However, neither of these possibilities are matched with the results of VLBI astrometry or the spatial distributions of H ii regions and H i gas. |
| WOS关键词 | PARALLAX MEASUREMENTS ; ACCURACY ; VERA ; SKY ; H2O |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | OXFORD UNIV PRESS |
| WOS记录号 | WOS:000899766400001 |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/5008]  |
| 专题 | 脉冲星研究团组 |
| 通讯作者 | Sakai, Nobuyuki |
| 作者单位 | 1.Univ Sci & Technol, Korea UST, 217 Gajeong Ro, Daejeon 34113, South Korea 2.Chinese Acad Sci, Key Lab Radio Astron, Dept Sch Educ, 2-2-1 Senju Sakuragi, Tokyo 1200045, Peoples R China 3.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 4.Kagoshima Univ, Grad Sch Sci & Engn, Amanogawa Galaxy Astron Res Ctr, 1-21-35 Korimoto, Kagoshima, Kagoshima 8900065, Japan 5.Natl Astron Observ Japan, Mizusawa VLBI Observ, Grad Sch Sci & Engn, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 6.Ulsan Natl Inst Sci & Technol, UNIST Gil 50, Ulsan 44919, South Korea 7.Iwate Nippo Co Ltd, 3-7 Uchimaru, Morioka, Iwate 0208622, Japan 8.Natl Astron Observ Japan, Mizusawa VLBI Observ, 2-12 Hoshigaoka, Oshu, Iwate 0230861, Japan 9.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 10.Natl Astron Res Inst Thailand, Publ Org, 260 Moo 4, Chiang Mai 50180, Thailand |
| 推荐引用方式 GB/T 7714 | Sakai, Nobuyuki,Zhang, Bo,Xu, Shuangjing,et al. East Asian VLBI Network astrometry toward the extreme outer Galaxy: Kinematic distance with the proper motion of G034.84-00.95[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2022:17. |
| APA | Sakai, Nobuyuki.,Zhang, Bo.,Xu, Shuangjing.,Sakai, Daisuke.,Tamura, Yoshiaki.,...&Wang, Na.(2022).East Asian VLBI Network astrometry toward the extreme outer Galaxy: Kinematic distance with the proper motion of G034.84-00.95.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,17. |
| MLA | Sakai, Nobuyuki,et al."East Asian VLBI Network astrometry toward the extreme outer Galaxy: Kinematic distance with the proper motion of G034.84-00.95".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN (2022):17. |
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