East Asian VLBI Network astrometry toward the extreme outer Galaxy: Kinematic distance with the proper motion of G034.84-00.95

doi:10.1093/pasj/psac102

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	East Asian VLBI Network astrometry toward the extreme outer Galaxy: Kinematic distance with the proper motion of G034.84-00.95
	Sakai, Nobuyuki 1,2; Zhang, Bo 3; Xu, Shuangjing 1,3; Sakai, Daisuke 4,5; Tamura, Yoshiaki 4; Jike, Takaaki 4; Jung, Taehyun 1; Oh, Chungsik 1; Kim, Jeong-Sook 6; Kawaguchi, Noriyuki 7; Imai, Hiroshi 8; Jiang, Wu 3; Cui, Lang9 ; Kim, Soon-Wook 1; Jiang, Pengfei9 ; Kurayama, Tomoharu 10; Lee, Jeong Ae 1; Hachisuka, Kazuya 4; Jung, Dong-Kyu 1; Xia, Bo 3; Li, Guanghui9 ; Honma, Mareki 4; Kim, Kee-Tae 1,11; Shen, Zhi-Qiang 3; Wang, Na9
	2023-02
Source Publication	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
ISSN	0004-6264
Volume	75 Issue:1 Pages:208-224
Contribution Rank	9
Abstract	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.
Keyword	Galaxy: disk Galaxy: kinematics and dynamics instrumentation: interferometers masers proper motions
DOI	10.1093/pasj/psac102
Indexed By	SCI
Language	英语
WOS Keyword	PARALLAX MEASUREMENTS ; ACCURACY ; VERA ; SKY ; H2O
WOS Research Area	Astronomy & Astrophysics
WOS Subject	Astronomy & Astrophysics
WOS ID	WOS:000899766400001
Publisher	OXFORD UNIV PRESS
Citation statistics	Cited Times:2[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.xao.ac.cn/handle/45760611-7/5009
Collection	射电天文研究室_脉冲星研究团组科研仪器设备产出_利用南山26米射电望远镜（NSRT）观测数据的文章
Corresponding Author	Sakai, Nobuyuki
Affiliation	1.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon, 34055, South Korea 2.Natl Astron Res Inst Thailand, Publ Org, 260 Moo 4, Chiang Mai 50180, Thailand 3.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 4.Natl Astron Observ Japan, Mizusawa VLBI Observ, 2-12 Hoshigaoka, Oshu, Iwate 0230861, Japan 5.Iwate Nippo Co Ltd, 3-7 Uchimaru, Morioka, Iwate 0208622, Japan 6.Ulsan Natl Inst Sci & Technol, UNIST Gil 50, Ulsan 44919, South Korea 7.Natl Astron Observ Japan, Mizusawa VLBI Observ, Grad Sch Sci & Engn, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 8.Kagoshima Univ, Grad Sch Sci & Engn, Amanogawa Galaxy Astron Res Ctr, 1-21-35 Korimoto, Kagoshima, Kagoshima 8900065, Japan 9.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 10.Chinese Acad Sci, Key Lab Radio Astron, Dept Sch Educ, 2-2-1 Senju Sakuragi, Tokyo 1200045, Peoples R China 11.Univ Sci & Technol, Korea UST, 217 Gajeong Ro, Daejeon 34113, South Korea
Recommended Citation 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,2023,75(1):208-224.
APA	Sakai, Nobuyuki.,Zhang, Bo.,Xu, Shuangjing.,Sakai, Daisuke.,Tamura, Yoshiaki.,...&Wang, Na.(2023).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,75(1),208-224.
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 75.1(2023):208-224.

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