NGC 404, a galaxy without dark matter

被引：0

作者：

del Río, MS ^{[1
]}

Brinks, E ^{[1
]}

Cepa, J ^{[1
]}

机构：

[1] INAOE, Tonantzintla, Mexico

来源：

IX LATIN AMERICAN REGIONAL MEETING OF THE INTERNATIONAL-ASTRONOMICAL-UNION | 2001年 / 11卷

关键词：

galaxies; early-type; individual; (NGC; 404);

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present high resolution (15" and 2.5km s(-1)) H I observations of the SO galaxy NGC 404. We derive an H I mass of M-HI = 6.7 x 10(7) M-circle dot, in good agreement with previous measurements. The H I is distributed in a broad annulus and extends out to a diameter of 9', well beyond the optical diameter of 6'. The velocity field is regular and shows, surprisingly, a declining rotation curve. This decline is purely Keplerian, strongly suggesting that all the mass is contained within the inner 200".

引用

页码：121 / 122

页数：2