| Elliptical Galaxies with Emission Lines from the Sloan Digital Sky Survey |
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| 作者姓名： | Ying-He Zhao Qiu-Sheng Gu Zhi-Xin Peng Lei Shi Xin-Lian Luo Qiu-He Peng |
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| 作者单位： | Ying-He Zhao Qiu-Sheng Gu Zhi-Xin Peng Lei Shi Xin-Lian Luo Qiu-He Peng Department of Astronomy，Nanjing University，Nanjing 210093 |
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| 基金项目： | Supported by the National Natural Science Foundation of China |
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| 摘 要： | As part of a study of star formation history along the Hubble sequence, we present here the results for 11 elliptical galaxies with strong nebular emission lines.After removing the dilution from the underlying old stellar populations by use of stellar population synthesis model,we derive the accurate fluxes of all the emission lines in these objects,which are then classified,using emission line ratios, into one Seyfert 2,six LINERs and four HII galaxies.We also identify one HII galaxy (A1216 04)as a hitherto unknown Wolf-Rayet galaxy from the presence of the Wolf- Rayet broad bump at 4650 (?).We propose that the star-forming activities in elliptical galaxies are triggered by either galaxy-galaxy interaction or the merging of a small satellite/a massive star cluster,as has been suggested by recent numerical simulations.
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| 关 键 词： | 星系 星暴 物理参数 法兰长度 星云 恒星 |
Elliptical Galaxies with Emission Lines from the Sloan Digital Sky Survey |
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| Ying-He Zhao Qiu-Sheng Gu Zhi-Xin Peng Lei Shi Xin-Lian Luo Qiu-He Peng.Elliptical Galaxies with Emission Lines from the Sloan Digital Sky Survey[J].Chinese Journal of Astronomy and Astrophysics,2006,6(1):15-24. |
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| Authors: | Ying-He Zhao Qiu-Sheng Gu Zhi-Xin Peng Lei Shi Xin-Lian Luo Qiu-He Peng |
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| Institution: | Department of Astronomy, Nanjing University, Nanjing 210093 |
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| Abstract: | As part of a study of star formation history along the Hubble sequence, we present here the results for 11 elliptical galaxies with strong nebular emission lines.After removing the dilution from the underlying old stellar populations by use of stellar population synthesis model,we derive the accurate fluxes of all the emission lines in these objects,which are then classified,using emission line ratios, into one Seyfert 2,six LINERs and four HII galaxies.We also identify one HII galaxy (A1216 04)as a hitherto unknown Wolf-Rayet galaxy from the presence of the Wolf- Rayet broad bump at 4650 (?).We propose that the star-forming activities in elliptical galaxies are triggered by either galaxy-galaxy interaction or the merging of a small satellite/a massive star cluster,as has been suggested by recent numerical simulations. |
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| Keywords: | Galaxies elliptical and lenticular cD-Galaxies:starburst-Galaxies:individual:A1212 06 A1216 04 CGCG13-83 IC 225 |
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