On the Structure of the Sagittarius Spiral Arm in the Inner Milky Way

doi:10.3847/1538-3881/ad4030

	On the Structure of the Sagittarius Spiral Arm in the Inner Milky Way
	Bian,S. B.1,2; Wu,Y. W.3; Xu,Y.1,2; Reid,M. J.4; Li,J. J.1; Zhang,B.5; Menten,K. M.6; Moscadelli,L.7; Brunthaler,A.6
	2024-05-17
发表期刊	The Astronomical Journal
ISSN	0004-6256
卷号	167 期号:6
摘要	Abstract We report measurements of trigonometric parallax and proper motion for two 6.7 GHz methanol and two 22 GHz water masers located in the far portion of the Sagittarius spiral arm as part of the BeSSeL Survey. Distances for these sources are estimated from parallax measurements combined with three-dimensional kinematic distances. The distances of G033.64?00.22, G035.57?00.03, G041.15?00.20, and G043.89?00.78 are 9.9 ± 0.5, 10.2 ± 0.6, 7.6 ± 0.5, and 7.5 ± 0.3 kpc, respectively. Based on these measurements, we suggest that the Sagittarius arm segment beyond about 8 kpc from the Sun in the first Galactic quadrant should be adjusted radially outward relative to previous models. This supports the suggestion of Xu et al. that the Sagittarius and Perseus spiral arms might merge in the first quadrant before spiraling inward to the far end of the Galactic bar.
DOI	10.3847/1538-3881/ad4030
语种	英语
WOS记录号	IOP:aj_167_6_267
出版者	The American Astronomical Society
引用统计
文献类型	期刊论文
条目标识符	http://210.72.145.45/handle/361003/14595
专题	高精度时间传递与精密测定轨研究室
作者单位	1.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210033, People's Republic of China; xuye@pmo.ac.cn 2.School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, People's Republic of China 3.National Time Service Center, Key Laboratory of Precise Positioning and Timing Technology, Chinese Academy of Sciences, Xi’an 710600, People's Republic of China 4.Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA 5.Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People's Republic of China 6.Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany 7.INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
推荐引用方式 GB/T 7714	Bian,S. B.,Wu,Y. W.,Xu,Y.,et al. On the Structure of the Sagittarius Spiral Arm in the Inner Milky Way[J]. The Astronomical Journal,2024,167(6).
APA	Bian,S. B..,Wu,Y. W..,Xu,Y..,Reid,M. J..,Li,J. J..,...&Brunthaler,A..(2024).On the Structure of the Sagittarius Spiral Arm in the Inner Milky Way.The Astronomical Journal,167(6).
MLA	Bian,S. B.,et al."On the Structure of the Sagittarius Spiral Arm in the Inner Milky Way".The Astronomical Journal 167.6(2024).