A high-resolution rotation curve of NGC 6822: a test-case for cold dark matter

被引：141
作者：
Weldrake, DTF
de Blok, WJG
Walter, F
机构：
[1] Mt Stromlo & Siding Spring Observ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
[2] Australia Telescope Natl Facil, Epping, NSW 1710, Australia
[3] CALTECH, Astron Dept 105 24, Pasadena, CA 91125 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2003年 / 340卷 / 01期
关键词：
galaxies : dwarf; galaxies : fundamental parameters; galaxies : individual : NGC 6822; galaxies : kinematics and dynamics; Local Group; dark matter;
D O I：
10.1046/j.1365-8711.2003.06170.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present high-resolution rotation curves of the Local Group dwarf irregular galaxy NGC 6822 obtained with the Australia Telescope Compact Array. Our best curves have an angular resolution of 8 arcsec or 20 pc and contain some 250 independent points. The stellar and gas components of NGC 6822 cannot explain the shape of the curve, except for the very inner regions, and NGC 6822 is consequently very dark-matter-dominated. There is no evidence for the presence of a steep density cusp down to scales of similar to20 pc, contrary to the predictions of cold dark matter.
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页码：12 / 28
页数：17
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