A GALACTIC ORIGIN FOR HE 0437-5439, THE HYPERVELOCITY STAR NEAR THE LARGE MAGELLANIC CLOUD

被引：37

作者：

Brown, Warren R. ^{[1
]}

Anderson, Jay ^{[2
]}

Gnedin, Oleg Y. ^{[3
]}

Bond, Howard E. ^{[2
]}

Geller, Margaret J. ^{[1
]}

Kenyon, Scott J. ^{[1
]}

Livio, Mario ^{[2
]}

机构：

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

[2] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[3] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 719卷 / 01期

关键词：

Galaxy: center; Galaxy: kinematics and dynamics; Galaxy: stellar content; Magellanic Clouds; stars: individual (HE 0437-5439); SUPERMASSIVE BLACK-HOLE; MAIN-SEQUENCE; HORIZONTAL-BRANCH; BLUE STRAGGLERS; STELLAR ORBITS; HOT STARS; HALO; HE-0437-5439; CLUSTERS; RUNAWAY;

D O I：

10.1088/2041-8205/719/1/L23

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use Hubble Space Telescope imaging to measure the absolute proper motion of the hypervelocity star (HVS) HE 0437-5439, a short-lived B star located in the direction of the Large Magellanic Cloud (LMC). We observe (mu(alpha), mu(delta)) = (+0.53 +/- 0.25(stat) +/- 0.33(sys), + 0.09 +/- 0.21(stat) +/- 0.48(sys)) mas yr(-1). The velocity vector points directly away from the center of the Milky Way; an origin from the center of the LMC is ruled out at the 3 sigma level. The flight time of the HVS from the Milky Way exceeds its main-sequence lifetime, thus its stellar nature requires it to be a blue straggler. The large space velocity rules out a Galactic-disk ejection. Combining the HVS's observed trajectory, stellar nature, and required initial velocity, we conclude that HE 0437-5439 was most likely a compact binary ejected by the Milky Way's central black hole.

引用

页码：L23 / L27

页数：5

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