Do Radio-loud Active Galactic Nuclei really follow the same – Relation as Normal Galaxies?
Chemical Evolution of Blue Compact Galaxies Fei Shi1,2, Xu Kong1 and Fu-Zhen Cheng1 1 Center for Astrophysics, University of Science and Technology of China, Hefei 230026 sfemail@mail.ustc.edu.cn; 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 (so
Chemical Evolution of Blue Compact Galaxies Fei Shi1,2, Xu Kong1 and Fu-Zhen Cheng1 1 Center for Astrophysics, University of Science and Technology of China, Hefei 230026 sfemail@mail.ustc.edu.cn; 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 (so
