Astrometry of Galactic Star-Forming Region Onsala 1 with VERA: Estimation of Angular Velocity of Galactic Rotation at the Sun

被引：24

作者：

Nagayama, Takumi ^{[1
]}

Omodaka, Toshihiro ^{[2
]}

Nakagawa, Akiharu ^{[2
]}

Handa, Toshihiro ^{[3
]}

Honma, Mareki ^{[1
]}

Kobayashi, Hideyuki ^{[1
]}

Kawaguchi, Noriyuki ^{[1
]}

Miyaji, Takeshi ^{[1
]}

机构：

[1] Natl Astron Observ Japan, Mizusawa VLBI Observ, Tokyo 1818588, Japan

[2] Kagoshima Univ, Grad Sch Sci & Engn, Kagoshima 8900065, Japan

[3] Univ Tokyo, Inst Astron, Tokyo 1810015, Japan

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2011年 / 63卷 / 01期

关键词：

astrometry; ISM: individual (Onsala 1); masers (H2O); H-II REGIONS; MILKY-WAY; TRIGONOMETRIC PARALLAXES; MOLECULAR CLOUDS; KINEMATICS; PARAMETERS; DISTANCE; MOTIONS; MASERS; GALAXY;

D O I：

10.1093/pasj/63.1.23

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We conducted the astrometry of H2O masers in the Galactic star-forming region Onsala 1 (ON 1) with the VLBI Exploration of Radio Astrometry (VERA). We measured a trigonometric parallax of 0.404 +/- 0.017 mas, corresponding to a distance of 2.47 +/- 0.11 kpc. ON 1 appears to be located near the tangent point at a Galactic longitude of 69 degrees.54. We estimated the angular velocity of the Galactic rotation at the Sun (the ratio of the Galactic rotation velocity at the Sun to the distance from the Sun to the Galactic center) to be Omega(0) = Theta(0)/R-0 = 28.7 +/- 1.3 km s(-1) kpc(-1) using the measured distance and proper motion of ON I. This value is larger than the IAU recommended value of (220 km s(-1)/8.5 kpc) = 25.9 km s(-1) kpc(-1), but consistent with other results recently obtained with the VLBI technique.

引用

页码：23 / 30

页数：8

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