The pattern speeds of M51, M83, and NGC 6946 using CO and the Tremaine-Weinberg method

被引：63

作者：

Zimmer, P ^{[1
]}

Rand, RJ ^{[1
]}

McGraw, JT ^{[1
]}

机构：

[1] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87106 USA

来源：

ASTROPHYSICAL JOURNAL | 2004年 / 607卷 / 01期

关键词：

galaxies; individual; (M51; M83; NGC; 6946); galaxies : ISM; galaxies : spiral; stellar dynamics;

D O I：

10.1086/383459

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In spiral galaxies in which the molecular phase dominates the ISM, the molecular gas as traced by CO emission will approximately obey the continuity equation on orbital timescales. The Tremaine-Weinberg method can then be used to determine the pattern speed of such galaxies. We have applied the method to single-dish CO maps of three nearby spirals, M51, M83, and NGC 6946, to obtain estimates of their pattern speeds: 38 +/- 7, 45 +/- 8, and 39 +/- 8 km s(-1) kpc(-1), respectively, and we compare these results to previous measurements. We also analyze the major sources of systematic errors in applying the Tremaine-Weinberg method to maps of CO emission.

引用

页码：285 / 293

页数：9

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