Hypervelocity stars. II. The bound population

被引：71

作者：

Brown, Warren R. ^{[1
]}

Geller, Margaret J.

Kenyon, Scott J.

Kurtz, Michael J.

机构：

[1] Smithsonian Astrophys Observ, Cambridge, MA 02138 USA

[2] Univ Utah, Dept Phys, Salt Lake City, UT 84112 USA

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 660卷 / 01期

关键词：

D O I：

10.1086/513595

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Hypervelocity stars (HVSs) are stars ejected completely out of the Milky Way by three-body interactions with the massive black hole in the Galactic center. We describe 643 new spectroscopic observations from our targeted survey for HVSs. We find a significant ( 3.5 sigma) excess of B-type stars with large velocities +275 km s(-1) < v(rf) < 450 km s(-1) and distances d > 10 kpc that are most plausibly explained as a new class of HVSs: stars ejected from the Galactic center on bound orbits. If a Galactic center ejection origin is correct, the distribution of HVSs on the sky should be anisotropic for a survey complete to a fixed limiting apparent magnitude. The unbound HVSs in our survey have a marginally anisotropic distribution on the sky, consistent with the Galactic center ejection picture.

引用

页码：311 / 318

页数：8

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