Star formation properties in barred galaxies (SFB) II. NGC 2903 and NGC 7080

Star formation properties in barred galaxies (SFB) II. NGC 2903 and NGC 7080
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棒状星系 (SFB) 中的恒星形成特性 II。

DOI:
10.1088/1674-4527/12/3/001
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发表时间:
2011-11
影响因子:
1.8
通讯作者:
Wu, Hong
Wu, Hong
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhou, Zhi-Min;Cao, Chen;Wu, Hong

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恒星棒对盘星系的长期演化很重要,因为它们可以将气体驱入星系中心区域。为了研究棒星系中星星的形成特性,我们对两个棒星系NGC 2903和NGC 7080进行了多波长研究。我们利用3.6 μm图像进行了三分量的球盘棒分解,确定了两个星系中的球是假球。基于窄带Hα图像,对星星形成团进行了识别和分析。在两个星系中,隆起区的团块具有最高的星星形成率表面密度,而NGC 2903棒中的星星形成活动比NGC 7080棒中的更强烈。最后,我们将我们的结果与以往研究中的棒驱动长期演化方案进行了比较,并讨论了两个星系可能的演化阶段。
Stellar bars are important for the secular evolution of disk galaxies because they can drive gas into the galactic central regions. To investigate the star formation properties in barred galaxies, we presented a multi-wavelength study of two barred galaxies: NGC 2903 and NGC 7080. We performed the three-component bulge-disk-bar decomposition using the 3.6 μm images, and identified the bulges in the two galaxies as pseudobulges. Based on the narrowband Hα images, the star formation clumps were identified and analyzed. The clumps in the bulge regions have the highest surface densities of star formation rates in both galaxies, while the star formation activities in the bar of NGC 2903 are more intense than those in the bar of NGC 7080. Finally, we compared our results with the scenario of bar-driven secular evolution in previous studies, and discussed the possible evolutionary stages of the two galaxies.
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