Mapping spiral structure on the far side of the Milky Way

被引：45

作者：

Sanna, Alberto ^{[1
]}

Reid, Mark J. ^{[2
]}

Dame, Thomas M. ^{[2
]}

Menten, Karl M. ^{[1
]}

Brunthaler, Andreas ^{[1
]}

机构：

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

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

来源：

SCIENCE | 2017年 / 358卷 / 6360期

关键词：

D O I：

10.1126/science.aan5452

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Little is known about the portion of the Milky Way lying beyond the Galactic center at distances of more than 9 kiloparsec from the Sun. These regions are opaque at optical wavelengths because of absorption by interstellar dust, and distances are very large and hard to measure. We report a direct trigonometric parallax distance of 20.4(-2.2)(+2.8) kiloparsec obtained with the Very Long Baseline Array to a water maser source in a region of active star formation. These measurements allow us to shed light on Galactic spiral structure by locating the Scutum-Centaurus spiral arm as it passes through the far side of the Milky Way and to validate a kinematic method for determining distances in this region on the basis of transverse motions.

引用

页码：227 / 229

页数：3

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