Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-11-15
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
17 pages, 5 figures, 3 tables, accepted for publication in RAA
Scientific paper
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 {\mu}m images, and identified the bulges in the two galaxies as pseudobulges. Based on the narrowband H{\alpha} images, the star formation clumps were identified and analyzed. the clumps in the bulge regions have the highest star formation rate surface densities 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 with the scenario of bar-driven secular evolution in previous studies, and discussed the possible evolutionary stages of the two galaxies.
Cao Chen
Wu Haibin
Zhou Zhi-Min
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