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

作　　者：Zhi-Min Zhou Chen Cao Hong Wu 

机构地区：[1]National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China [3]Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China [4]School of Space Science and Physics, Shandong University at Weihai, Weihai 264209, China [5]Shandong Provincial Key Laboratory of OpticalAstronomy ＆ Solar-Terrestrial Environment, Weihai 264209, China

出　　处：《Research in Astronomy and Astrophysics》2012年第3期235-248,共14页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11173030, 10833006, 10773014,10978014 and 11078017);the National Basic Research Program of China (973 Program,Grant Nos. 2007CB815406 and 2012CB821803);partially supported by the Open Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories,Chinese Academy of Sciences

摘　　要：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-diskbar 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.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-diskbar 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.

关 键 词：galaxies： evolution—galaxies： individual （NGC 2903 NGC 7080）—galaxies： star formation—galaxies： structure 

分 类 号：P144[天文地球—天体物理] P152[天文地球—天文学]