Determination of Galactic Rotation Parameters and the Solar Galactocentric Distance R0 from 73 Masers

被引：17

作者：

Bobylev, V. V. ^{[1
,2
]}

Bajkova, A. T. ^{[1
]}

机构：

[1] Russian Acad Sci, Pulkovo Astron Observ, St Petersburg 196140, Russia

[2] St Petersburg State Univ, Sobolev Astron Inst, Petrodvorets 198504, Russia

来源：

ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS | 2014年 / 40卷 / 07期

关键词：

kinematics; masers; rotation curve; solar Galactocentric distance; Galaxy (Milky Way); DENSITY WAVE PARAMETERS; FORMING REGIONS. VI; MILKY-WAY; TRIGONOMETRIC PARALLAXES; VLBA DETERMINATION; VELOCITY-FIELD; YOUNG STARS; ORION-KL; KINEMATICS; CURVE;

D O I：

10.1134/S1063773714070020

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have determined the Galactic rotation parameters and the solar Galactocentric distance R-0 by simultaneously solving Bottlinger's kinematic equations using data on masers with known line-of-sight velocities and highly accurate trigonometric parallaxes and proper motions measured by VLBI. Our sample includes 73 masers spanning the range of Galactocentric distances from 3 to 14 kpc. The solutions found are Omega(0) = 28.86 +/- 0.45 km s(-1) kpc(-1), Omega'(0) = -3.96 +/- 0.09 km s(-1) kpc(-2), Omega''(0) = 0.790 +/- 0.027 km s(-1) kpc(-3), and R-0 = 8.3 +/- 0.2 kpc. In this case, the linear rotation velocity at the solar distance R-0 is V = 241 +/- 7 km s(-1). Note that we have obtained the R-0 estimate, which is of greatest interest, from masers for the first time; it is in good agreement with the most recent estimates and even surpasses them in accuracy.

引用

页码：389 / 397

页数：9

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