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Chemical evolution of Blue Compact galaxies

Chinese Journal of Astronomy and Astrophysics 2006年第6期6卷 641-648页

作者： Fci Shi Xu Kong Fu-Zhcn Chcng Center for Astrophysics University of Science and Technology of China Hefei 230026 National Astronomical Observatories Chinese Academy of Sciences Beijing 100012

Based on a sample of 72 Blue Compact galaxies （BCGs） observed with the 2.16 m 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： galaxies abundance - galaxies evolution -galaxies starburst- stars formarion

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Star-Forming galaxies at z～2 in the Hubble Ultra Deep Field

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Chinese Journal of Astronomy and Astrophysics 2008年第1期8卷 1-11页

作者： Xu Kong Wei Zhang Min Wang Center for Astrophysics University of Science and Technology of China Hefei 230026 Joint Institute for Galaxy and Cosmology （JOINGC） of SHAO and USTC National Astronomical Observatories Chinese Academy of Sciences Beijing 100012

Using a simple color selection based on B-, z- and K-band photometry, BzK =（z - K）AB - （B - Z）AB 〉 -0.2, we picked out 52 star-forming galaxies at 1.4 ≤z ≤ 2.5 （sBzKs） from a K-band selected sample （Kvega 〈 22.0） in an area of - 5.5 arcmin^2 of the Hubble Ultra Deep Field （UDF）. We develop a new photometric redshift method, and the error in our photometric redshifts is less than 0.02（1 ＋ z）. From the photometric redshift distribution, we find the BzK color criterion can be used to select star-forming galaxies at 1.4≤ z ≤ 2.5 with Kvega 〈 22.0. Down to Kvega 〈 22.0, the number counts of sBzKs increase linearly with the K magnitude; the sBzKs are strongly clustered, and most of them have irregular morphologies on the ACS images. They have a median reddening of E（B - V） - 0.28, an average star formation rate of - 36 M⊙ yr^-1 and a typical stellar mass of - 10^10 M⊙. The UV criterion for the galaxies at z - 2 can select most of the faint sBzKs in the UDF, but it does not work well for bright, massive, highly-reddened, actively star-forming galaxies.

关键词： galaxies evolution -galaxies high-redshift - galaxies photometry - cosmology observations

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