| A Study of the Star-forming Dwarf Galaxy NGC 855 with Spitzer |
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| 作者姓名： | Sheng-Peng Li Qiu-Sheng Gu Ying-He Zhao Jia-Sheng Huang Xin-Lian Luo |
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| 作者单位： | [1]Department of Astronomy, Nanjing University, Nanjing 210093 [2]Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 |
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| 基金项目： | Supported by the National Natural Science Foundation of China. |
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| 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 0.025Mo yr^-1, respectively, from the Spitzer IRAC 8.0 μm and MIPS 24 #m emission data. The HI observation 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 8.0 μm bands, located at about 10＂ away from the nucleus of NGC 855. Given the strong 8.0 μm 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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| 关 键 词： | 星系 椭圆星系 NGC 855 尖头式 |
| 收稿时间： | 2007-03-21 |
| 修稿时间： | 2007-04-26 |
A Study of the Star-forming Dwarf Galaxy NGC 855 with Spitzer |
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| Abstract: | |
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| Keywords: | galaxies elliptical -- galaxies individual NGC 855 |
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