Is the Large Magellanic Cloud microlensing due to an intervening dwarf galaxy?

被引：35

作者：

Alcock, C

Allsman, RA

Alves, DR

Axelrod, TS

Becker, AC

Bennett, DP

Cook, KH

Freeman, KC

Griest, K

Lehner, MJ

Marshall, SL

Minniti, D

Peterson, BA

Pratt, MR

Quinn, PJ

Rodgers, AW

Rorabeck, A

Stubbs, CW

Sutherland, W

Tomaney, AB

Vandehei, T

Welch, DL

机构：

[1] UNIV CALIF BERKELEY, CTR PARTICLE ASTROPHYS, BERKELEY, CA 94720 USA

[2] AUSTRALIAN NATL UNIV, MT STROMLO & SIDING SPRING OBSERV, WESTON, ACT 2611, AUSTRALIA

[3] UNIV CALIF DAVIS, DEPT PHYS, DAVIS, CA 95616 USA

[4] UNIV WASHINGTON, DEPT ASTRON, SEATTLE, WA 98195 USA

[5] UNIV NOTRE DAME, DEPT PHYS, NOTRE DAME, IN 46556 USA

[6] UNIV CALIF SAN DIEGO, DEPT PHYS, LA JOLLA, CA 92093 USA

[7] UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA

[8] EUROPEAN SO OBSERV, D-85748 GARCHING, GERMANY

[9] MCMASTER UNIV, DEPT PHYS & ASTRON, HAMILTON, ON L8S 4M1, CANADA

[10] UNIV OXFORD, DEPT PHYS, CLARENDON LAB, OXFORD OX1 3RH, ENGLAND

来源：

ASTROPHYSICAL JOURNAL | 1997年 / 490卷 / 01期

基金：

美国国家科学基金会;

关键词：

galaxies; individual (Large Magellanic Cloud; Sagittarius); Galaxy; halo; stars; individual (RR Lyrae); variables; other;

D O I：

10.1086/311016

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The recent suggestion that the microlensing events observed toward the Large Magellanic Cloud are due to an intervening Sgr-like dwarf galaxy is examined. A search for foreground RR Lyrae in the MACHO photometry database yields 20 stars whose distance distribution follow the expected halo density profile. Cepheid and red giant branch clump stars in the MACHO database are consistent with membership in the LMC. There is also no evidence in the literature for a distinct kinematic population, for intervening gas, or for the turnoff of such a hypothetical galaxy. We conclude that if the lenses are in a foreground galaxy, it must be a particularly dark galaxy.

引用

页码：L59 / L63

页数：5

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