The bar pattern speed of dwarf galaxy NGC 4431

被引：26

作者：

Corsini, E. M. ^{[1
]}

Aguerri, J. A. L.

Debattista, Victor P.

Pizzella, A.

Barazza, F. D.

Jerjen, H.

机构：

[1] Univ Padua, Dipartimento Astron, I-35122 Padua, Italy

[2] Inst Astrofis Canarias, E-38200 San Cristobal la Laguna, Spain

[3] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[4] Univ Texas, Dept Astron, Austin, TX 78712 USA

[5] Australian Natl Univ, Mt Stromlo & Siding Spring Observ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 659卷 / 02期

关键词：

galaxies : elliptical and lenticular; cD; galaxies : individual (NGC 4431); galaxies : kinematics and dynamics; galaxies : photometry; galaxies : structure;

D O I：

10.1086/518035

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present surface photometry and stellar kinematics of NGC 4431, a barred dwarf galaxy in the Virgo Cluster undergoing a tidal interaction with one of its neighbors, NGC 4436. We measured its bar pattern speed using the Tremaine-Weinberg method and derived the ratio of the corotation radius, D-L, to the bar semimajor axis, a(B). We found D-L/a(B) = 0.06(-0.4)(+1.2) at 99% confidence level. Albeit with large uncertainity, the probability that the bar ends close to its corotation radius (i.e., 1.0 <= D-L/a(B) <= 1.4) is about twice as likely as that the bar is much shorter than the corotation radius ( i.e., D-L/a(B) > 1.4)

引用

页码：L121 / L124

页数：4

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