A comparison of the local spiral structure from Gaia DR2 and VLBI maser parallaxes

被引：67

作者：

Xu, Y. ^{[1
]}

Bian, S. B. ^{[1
,2
]}

Reid, M. J. ^{[3
]}

Li, J. J. ^{[1
]}

Zhang, B. ^{[4
]}

Yan, Q. Z. ^{[4
]}

Dame, T. M. ^{[3
]}

Menten, K. M. ^{[5
]}

He, Z. H. ^{[1
]}

Liao, S. L. ^{[4
]}

Tang, Z. H. ^{[4
]}

机构：

[1] Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China

[2] Shanghai Normal Univ, Shanghai 200234, Peoples R China

[3] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[4] Shanghai Observ, Shanghai 200030, Peoples R China

[5] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2018年 / 616卷

基金：

上海市自然科学基金; 中国国家自然科学基金;

关键词：

Galaxy: structure; stars: early-type; stars: massive; masers; COMPLEXES; CATALOG;

D O I：

10.1051/0004-6361/201833407

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. The Gaia mission has released the second data set (Gaia DR2), which contains parallaxes and proper motions for a large number of massive, young stars. Aims. We investigate the spiral structure in the solar neighborhood revealed by Gaia DR2 and compare it with that depicted by VLBI maser parallaxes. Methods. We examined three samples with different constraints on parallax uncertainty and distance errors and stellar spectral types: (1) all OB stars with parallax errors of less than 10%; (2) only O-type stars with 0.1 mas errors imposed and with parallax distance errors of less than 0.2 kpc; and (3) only O-type stars with 0.05 mas errors imposed and with parallax distance errors of less than 0.3 kpc. Results. In spite of the significant distance uncertainties for stars in DR2 beyond 1.4 kpc, the spiral structure in the solar neighborhood demonstrated by Gaia agrees well with that illustrated by VLBI maser results. The O-type stars available from DR2 extend the spiral arm models determined from VLBI maser parallaxes into the fourth Galactic quadrant, and suggest the existence of a new spur between the Local and Sagittarius arms.

引用

页数：4

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