The connection between shear and star formation in spiral galaxies

被引：30

作者：

Seigar, Marc S. ^{[1
]}

机构：

[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2005年 / 361卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

galaxies: fundamental parameters; galaxies: spiral; infrared: galaxies;

D O I：

10.1111/j.1745-3933.2005.00056.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a sample of 33 galaxies for which we have calculated (i) the average rate of shear from published rotation curves, (ii) the far-infrared luminosity from IRAS fluxes, and (iii) the K-s-band luminosity from the Two Micron All Sky Survey (2MASS). We show that a correlation exists between the shear rate and the ratio of the far-infrared to K-s-band luminosity. This ratio is essentially a measure of the star formation rate per unit mass, or the specific star formation rate. From this correlation we show that a critical shear rate exists, above which star formation would turn off in the discs of spiral galaxies. Using the correlation between shear rate and spiral arm pitch angle, this shear rate corresponds to the lowest pitch angles typically measured in near-infrared images of spiral galaxies.

引用

页码：L20 / L24

页数：5

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