Anomalous peculiar motions of high-mass young stars in the Scutum spiral arm

被引：28
作者：
Immer, K. [1 ]
Li, J. [2 ]
Quiroga-Nunez, L. H. [1 ,3 ]
Reid, M. J. [4 ]
Zhang, B. [5 ]
Moscadelli, L. [6 ]
Rygl, K. L. J. [7 ]
机构：
[1] Joint Inst VLBI ERIC, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands
[2] Purple Mt Observ CAS, 8 Yuanhua Rd, Nanjing 210034, Jiangsu, Peoples R China
[3] Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands
[4] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
[5] Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
[6] Osserv Astrofis Arcetri, Inst Natl Astrofis, Largo Enrico Fermi 5, I-50125 Florence, Italy
[7] INAF Ist Radioastron, Italian ALMA Reg Ctr, Via P Gobetti 101, I-40129 Bologna, Italy
来源：
ASTRONOMY & ASTROPHYSICS | 2019年 / 632卷
基金：
欧盟地平线“2020”;
关键词：
masers; astrometry; parallaxes; proper motions; Galaxy; structure; MILKY-WAY; MOLECULAR CLOUDS; FORMING REGIONS; METHANOL MASERS; BAR; DISTANCE; GALAXIES;
D O I：
10.1051/0004-6361/201834208
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present trigonometric parallax and proper motion measurements toward 22 GHz water and 6.7 GHz methanol masers in 16 high-mass star-forming regions. These sources are all located in the Scutum spiral arm of the Milky Way. The observations were conducted as part of the Bar and Spiral Structure Legacy (BeSSeL) survey. A combination of 14 sources from a forthcoming study and 14 sources from the literature, we now have a sample of 44 sources in the Scutum spiral arm, covering a Galactic longitude range from 0 degrees to 33 degrees. A group of 16 sources shows large peculiar motions of which 13 are oriented toward the inner Galaxy. A likely explanation for these high peculiar motions is the combined gravitational potential of the spiral arm and the Galactic bar.
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页数：26
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