A Study of the Star-forming Dwarf Galaxy NGC 855 with Spitzer

被引：0
|
作者：
Sheng-Peng Li1
2 Harvard-Smithsonian Center for Astrophysics
机构：
来源：
Research in Astronomy and Astrophysics | 2007年 / 06期
基金：
中国国家自然科学基金;
关键词：
galaxies:; elliptical; —; individual:; NGC; 855;
D O I：
暂无
中图分类号：
P152 [恒星天文学、星系天文学];
学科分类号：
070401 ;
摘要：
We present a study of the dwarf elliptical galaxy NGC 855 using the narrow-band Hα and Spitzer data. Both the Hα and Spitzer IRAC images confirm star-forming activity in the center of NGC 855. We obtained a star formation rate (SFR) of 0.022 and 0.025M◎yr-1,respectively,from the Spitzer IRAC 8.0μm and MIPS 24μm emission data. The HI observa-tion suggests that the star-forming activity might be triggered by a minor merger. We also find that there is a distinct IR emission region in 5.8 and 8.0μm bands,located at about 10 away from the nucleus of NGC 855. Given the strong 8.0μm but faint Hα emission,we expect that it is a heavily obscured star-forming region,which needs to be confirmed by further optical spectroscopic observations.
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收藏
页码：764 / 770
页数：7
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