首页 | 本学科首页   官方微博 | 高级检索  
     检索      

Chemical Evolution of Blue Compact Galaxies
作者姓名:Fei Shi  Xu Kong and Fu-Zhen Cheng Center for Astrophysics  University of Science and Technology of China  Hefei National Astronomical Observatories  Chinese Academy of Sciences  Beijing
作者单位:Fei Shi,Xu Kong and Fu-Zhen Cheng Center for Astrophysics,University of Science and Technology of China,Hefei 230026 National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012
基金项目:Supported by the National Natural Science Foundation of China.
摘    要:Based on a sample of 72 Blue Compact Galaxies (BCGs) observed with the 2.16m telescope of the National Astronomical Observatories, Chinese Academy of Sciences (NAOC) and about 4000 strong emission line galaxies from the Sloan Digital Sky Survey, we analyzed their chemical evolution history using the revised chemical evolution model of Larsen et al. Our sample covers a much larger metallicity range (7.2 < 12 log(O/H) < 9.0). We found that, in order to reproduce the observed abundance pattern and gas fraction over the whole metallicity range, a relatively continuous star formation history is needed for high metallicity galaxies, while assuming a series of instantaneous bursts with long quiescent periods (some Gyrs) for low metallicity galaxies. Model calculations also show that only the closed-box model is capable of reproducing the observational data over the whole metallicity range. Models that consider the ordinary winds and/or inflow can only fit the observations in the low metallicity range, and a model with enriched wind cannot fit the data in the whole metallicity range. This implies that the current adopted simple wind and inflow models are not applicable to massive galaxies, where the underlying physics of galactic winds or inflow could be more complicated.

关 键 词:兰色致密星系  丰度  化学演化  星爆

Chemical Evolution of Blue Compact Galaxies
Fei Shi,Xu Kong and Fu-Zhen Cheng Center for Astrophysics,University of Science and Technology of China,Hefei National Astronomical Observatories,Chinese Academy of Sciences,Beijing .Chemical Evolution of Blue Compact Galaxies[J].Chinese Journal of Astronomy and Astrophysics,2006,6(6):641-648.
Authors:Fei Shi  Xu Kong  Fu-Zhen Cheng
Institution:[1]Center for Astrophysics, University of Science and Technology of China, Hefei 230026 [2]National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012
Abstract:Based on a sample of 72 Blue Compact Galaxies (BCGs) observed with the 2.16m telescope of the National Astronomical Observatories, Chinese Academy of Sciences (NAOC) and about 4000 strong emission line galaxies from the Sloan Digital Sky Survey, we analyzed their chemical evolution history using the revised chemical evolution model of Larsen et al. Our sample covers a much larger metallicity range (7.2 < 12 log(O/H) < 9.0). We found that, in order to reproduce the observed abundance pattern and gas fraction over the whole metallicity range, a relatively continuous star formation history is needed for high metallicity galaxies, while assuming a series of instantaneous bursts with long quiescent periods (some Gyrs) for low metallicity galaxies. Model calculations also show that only the closed-box model is capable of reproducing the observational data over the whole metallicity range. Models that consider the ordinary winds and/or inflow can only fit the observations in the low metallicity range, and a model with enriched wind cannot fit the data in the whole metallicity range. This implies that the current adopted simple wind and inflow models are not applicable to massive galaxies, where the underlying physics of galactic winds or inflow could be more complicated.
Keywords:galaxies: abundance - galaxies: evolution - galaxies: starburst - stars: formation
本文献已被 CNKI 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号