在盘星系中心质量浓度的建立中棒的作用的定量
Quantifying the role of bars in the build-up of central mass concentrations in disk galaxies
摘要：
我们分析了酒吧的作用，在大规模的盘状星系的中心质量浓度的积累。我们的母样本由3757个红移在0.01和0.05之间的盘面星系组成，选自斯隆数字巡天的第七次数据发布。利用$i$波段光的位置角和椭圆率分布，识别出1555个带条星系。我们比较了在1 - 3千秒差距的星系中心区域测量到的特定恒星形成率与整个星系测量到的比率。具有强棒的星系有中心增强的恒星形成;增强的程度主要取决于棒的椭圆率，而不是棒的大小或宿主星系的质量或结构。当恒星质量大于$3 \times 10^{10} M_{\odot}$，恒星表面密度小于$3 \times 10^8 M_{\odot}$，浓度指数小于2.5时，具有强棒的星系比例最高。在这个参数空间区域，具有强棒的星系要么具有增强的中心恒星形成速率，要么与平均值相比，恒星形成受到{\em抑制}。这表明，棒可能在星系中恒星形成的最终淬灭中发挥作用。只有50%的恒星形成高度集中的星系具有强棒，这表明其他过程，如星系相互作用，也会诱发中心恒星爆发。我们还发现，酒吧的大小的比率，磁盘主要取决于星系的颜色，这表明酒吧的增长和破坏是由气体吸积，模拟所建议的。
英文摘要：
We analyze the role of bars in the build-up of central mass concentrations in massive, disk galaxies. Our parent sample consists of 3757 face-on disk galaxies with redshifts between 0.01 and 0.05, selected from the seventh Data Release of the Sloan Digital Sky Survey. 1555 galaxies with bars are identified using position angle and ellipticity profiles of the $i$-band light. We compare the ratio of the specific star formation rate measured in the 1-3 kpc central region of the galaxy to that measured for the whole galaxy. Galaxies with strong bars have centrally enhanced star formation; the degree of enhancement depends primarily on the ellipticity of the bar, and not on the size of the bar or on the mass or structure of the host galaxy. The fraction of galaxies with strong bars is highest at stellar masses greater than $3 \times 10^{10} M_{\odot}$, stellar surface densities less than $3 \times 10^8 M_{\odot}$ and concentration indices less than 2.5. In this region of parameter space, galaxies with strong bars either have enhanced central star formation rates, or star formation that is {\em suppressed} compared to the mean. This suggests that bars may play a role in the eventual quenching of star formation in galaxies. Only 50% of galaxies with strongly concentrated star formation have strong bars, indicating that other processes such as galaxy interactions also induce central star-bursts. We also find that the ratio of the size of the bar to that of the disk depends mainly on the colour of the galaxy, suggesting that the growth and destruction of bars are regulated by gas accretion, as suggested by simulations.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
