Five E+A (post-starburst) galaxies as Brightest Cluster Galaxies  

作　　者：LIU FengShan WEN ZhongLue HAN JinLin MENG XianMin 

机构地区：[1]College of Physical Science and Technology,Shenyang Normal University,Shenyang 110034,China [2]National Astronomical Observatories,Chinese Academy of Sciences,A20 Datun Road,Beijing 100012,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2012年第2期354-357,共4页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Liaoning Educational Foundation of China (Grant No.2009A646);the National Natural Science Foundation of China (Grant Nos.10773016,10821061 and 1083303);the National Key Basic Research Science Foundation of China (Grant No.2007CB815403);Funding for the creation and distribution of the SDSS Archive has been provided by the Alfred P.Sloan Foundation

摘　　要：Brightest Cluster Galaxies （BCGs） are mostly elliptical galaxies and very rarely have prominent star formations. We found that five out of 8,812 BCGs are E＋A （i.e., post-starburst） galaxies, having an Hd absorption line with an equivalent width 〉2.5 A and no distinct emission lines in [O II] and Ha-. The E＋A features we identified from the BCGs for the first time are not as significant as those in general galaxies, indicating that historically the star formations were not very violent.Brightest Cluster Galaxies (BCGs) are mostly elliptical galaxies and very rarely have prominent star formations.We found that five out of 8,812 BCGs are E+A (i.e.,post-starburst) galaxies,having an H absorption line with an equivalent width >2.5 and no distinct emission lines in [O II] and H.The E+A features we identified from the BCGs for the first time are not as significant as those in general galaxies,indicating that historically the star formations were not very violent.

关 键 词：GALAXIES CLUSTERS GENERAL 

分 类 号：P157.8[天文地球—天文学] P145.5