| A Study of the Star-forming Dwarf Galaxy NGC 855 with Spitzer |
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| 引用本文： | Sheng-Peng Li1,Qiu-Sheng Gu1,Ying-He Zhao1,Jia-Sheng Huang2 and Xin-Lian Luo1 1 Department of Astronomy,Nanjing University,Nanjing 210093,2 Harvard-Smithsonian Center for Astrophysics,60 Garden Street,Cambridge,MA 02138. A Study of the Star-forming Dwarf Galaxy NGC 855 with Spitzer[J]. 中国天文和天体物理学报, 2007, 7(6): 764-770 |
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| 作者姓名： | Sheng-Peng Li1 Qiu-Sheng Gu1 Ying-He Zhao1 Jia-Sheng Huang2 and Xin-Lian Luo1 1 Department of Astronomy Nanjing University Nanjing 210093 2 Harvard-Smithsonian Center for Astrophysics 60 Garden Street Cambridge MA 02138 |
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| 作者单位： | Sheng-Peng Li1，Qiu-Sheng Gu1，Ying-He Zhao1，Jia-Sheng Huang2 and Xin-Lian Luo1 1 Department of Astronomy，Nanjing University，Nanjing 210093;2 Harvard-Smithsonian Center for Astrophysics，60 Garden Street，Cambridge，MA 02138 |
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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 0.025M◎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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| 关 键 词： | galaxies: elliptical — galaxies: individual: NGC 855 |
A Study of the Star-forming Dwarf Galaxy NGC 855 with Spitzer |
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| Sheng-Peng Li,Qiu-Sheng Gu,Ying-He Zhao,Jia-Sheng Huang,Xin-Lian Luo. A Study of the Star-forming Dwarf Galaxy NGC 855 with Spitzer[J]. Chinese Journal of Astronomy and Astrophysics, 2007, 7(6): 764-770 |
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| Authors: | Sheng-Peng Li Qiu-Sheng Gu Ying-He Zhao Jia-Sheng Huang Xin-Lian Luo |
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| Abstract: | |
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| Keywords: | galaxies: elliptical-galaxies: individual: NGC 855 |
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