STELLAR POPULATION PROPERTIES AND EVOLUTION ANALYSIS OF NGC 628 WITH PANCHROMATIC PHOTOMETRY

STELLAR POPULATION PROPERTIES AND EVOLUTION ANALYSIS OF NGC 628 WITH PANCHROMATIC PHOTOMETRY
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NGC 628 的星族特性及全色光度分析

DOI:
10.1088/0004-6256/142/1/16
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发表时间:
2011-04
影响因子:
5.3
通讯作者:
Tianmeng Zhang
Tianmeng Zhang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hu Zou;Zhou Fan;Wei Zhang;Yanbin Yang;Xu Zhou;Zhaoji Jiang;Jun Ma;Zhenyu Wu;Jianghua Wu;Tianmeng Zhang

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利用NGC 628的紫外、光学和红外光谱能量分布,结合演化恒星群的合成,得出了空间分辨的年龄、金属丰度和变红图。这些参数分布表明,该星系的凸起是一个盘状假凸起,其ssamrsic指数接近指数律,具有丰富的气体和年轻的环核环结构。我们还发现圆盘有两个不同的区域,具有不同的径向年龄和金属丰度梯度。内部区域比外部区域更古老,年龄梯度也更陡峭。这两个区域和中心年轻结构都可以在光学色的径向轮廓中看到。根据年龄和变红分布,我们得出结论,假凸起和盘可能是通过长期演化形成的,这是由螺旋的非轴对称势引起的角动量输运引起的质量和能量的重新分配。然而,由于大量的氢气体聚集在外盘,可能的气体吸积事件可能会影响到盘的外部区域。
Panchromatic spectral energy distribution from the ultraviolet, optical to infrared photometry of NGC 628, combined with evolutionary stellar population synthesis, is used to derive the spatially resolved age, metallicity, and reddening maps. These parameter distributions show that the bulge of this galaxy is a disk-like pseudobulge, which has a Sérsic index close to the exponential law, rich gas, and a young circumnuclear ring structure. We also discover that the disk has two distinct regions with different radial age and metallicity gradients. The inner region is older and has a much steeper age gradient than the outer region of the disk. Both these two regions and the central young structure can be seen in the radial profile of the optical color. Based on the age and reddening distributions, we conclude that the pseudobulge and disk are likely to have grown via secular evolution, which is the redistribution of mass and energy through the angular momentum transport caused by the non-axisymmetric potential of the spirals. However, possible gas accretion events could affect the outer region of the disk due to abundant H i gas accumulating in the outer disk.
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