SiO maser survey towards off-plane O-rich AGBs around the orbital plane of the Sagittarius stellar stream

doi:10.1093/mnras/stx2450

	SiO maser survey towards off-plane O-rich AGBs around the orbital plane of the Sagittarius stellar stream
	Wu, Y. W.1,2; Matsunaga, Noriyuki 3; Burns, Ross A.4; Zhang, B.5
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2018
卷号	473 期号:3 页码:3325-3350
关键词	masers stars: AGB and post-AGB Galaxy: structure radio lines: stars
ISSN号	0035-8711
DOI	10.1093/mnras/stx2450
英文摘要	We conducted an SiO maser survey towards 221 O-rich AGB stars, with the aim of identifying maser emission associated with the Sagittarius stellar stream. In this survey, maser emission was detected in 44 targets, of which 35 were new detections. All of these masers are within 5 kpc of the Sun. We also compiled a Galactic SiO maser catalogue including similar to 2300 SiO masers from the literature. The distribution of these SiO masers gives a scaleheight of 0.40 kpc, while 42 sources deviate from the Galactic plane by more than 1.2 kpc, half of which were found in this survey. Regarding SiO masers in the disc, we found that both rotational speeds and velocity dispersions vary with Galactic plane distance. Assuming a Galactic rotational speed Theta(0) = 240 km s(-1), we derived velocity lags of 15 and 55 km s(-1) for disc and off-plane SiO masers, respectively. Moreover, we identified three groups with significant peculiar motions (with 70 per cent confidence). The most significant group is in the thick disc that might trace stream/peculiar motion of the Perseus arm. The other two groups are mainly made up of off-plane sources. The northern and southern off-plane sources were found to be moving at similar to 33 and 54 km s(-1) respectively away from the Galactic plane. The causes of these peculiar motions are still unclear. For the two off-plane groups, we suspect that they are thick disc stars, with kinematics affected by the Sgr stellar stream or very old Sgr stream debris.
资助项目	National Aeronautics and Space Administration
WOS关键词	BULGE IRAS SOURCES ; LONG-PERIOD VARIABLES ; MILKY-WAY ; GALACTIC-CENTER ; TIDAL STREAMS ; DWARF GALAXY ; STARS ; HALO ; EMISSION ; CATALOG
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000423809400037
资助机构	National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration ; National Aeronautics and Space Administration
内容类型	期刊论文
源URL	[http://210.72.145.45/handle/361003/11473]
专题	中国科学院国家授时中心
通讯作者	Wu, Y. W.
作者单位	1.Natl Astron Observ Japan, Mizusawa VLBI Observ, Mitaka, Tokyo 1818588, Japan 2.Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Shaanxi, Peoples R China 3.Univ Tokyo, Sch Sci, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan 4.Joint Inst VLBI ERIC, Postbus 2, NL-7990 AA Dwingeloo, Netherlands 5.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Wu, Y. W.,Matsunaga, Noriyuki,Burns, Ross A.,et al. SiO maser survey towards off-plane O-rich AGBs around the orbital plane of the Sagittarius stellar stream[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,473(3):3325-3350.
APA	Wu, Y. W.,Matsunaga, Noriyuki,Burns, Ross A.,&Zhang, B..(2018).SiO maser survey towards off-plane O-rich AGBs around the orbital plane of the Sagittarius stellar stream.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,473(3),3325-3350.
MLA	Wu, Y. W.,et al."SiO maser survey towards off-plane O-rich AGBs around the orbital plane of the Sagittarius stellar stream".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473.3(2018):3325-3350.