星系团Abell 85的光度函数

发布时间：2018-02-09 10:49

本文关键词： 星系星系团个别 Abell 星系光度函数星系统计　出处：《天文学报》2014年01期 　论文类型：期刊论文

【摘要】：基于NASA/IPAC河外星系数据库(NASA/IPAC Extragalactic Database,NED)和Sloan数字巡天(Sloan Digital Sky Survey,SDSS)第8次释放的数据(The Eighth Data Release,DR8),对星系团Abell 85(以下简称A85)的2倍动力学特征半径2r_(200)内的光度函数(Luminosity Function,LF)进行了研究.研究表明,A85的光度函数在Sloan巡天5个波段用Schechter函数均能拟合得很好.在u、g和z波段光度函数都显示出1个下凹.早型星系r波段的两个最佳拟合参数(r波段特征绝对星等和暗端的陡度)分别为M_r~*=-21.14_(-0.17)~(+0.17)mag,α=-0.83_(-0.14)~(+0.12),晚型星系为M_r~*=-21.98_(-0.98)~(+0.84)mag,α=-1.5_(-0.35)~(+0.24).早型星系的特征星等暗于晚型星系,而暗端比晚型星系要平坦得多.早型星系的光度函数在-20.5~-20.0 mag下凹.将1.5r_(200)范围内的星系按距离团中心的远近划分为3个环状区域,发现距离团中心越近,光度函数的暗端越陡,特征星等越亮.
[Abstract]:Based on the eighth release of data from NASA/IPAC / IPAC Extragalactic Database and Sloan Sloan Digital Sky Survey, the luminosity function of the cluster Abell 85 (hereinafter referred to as A85) within the dynamic characteristic radius of 2rStud was studied. The results show that the photometric function of A85 can be fitted well by Schechter function in the five bands of Sloan survey, and the two best fitting parameters of r-band of early galaxies are very special in r band of both UG and z band. The absolute magnitude and the steepness of the dark end are respectively Mrseng-21.14S-1 / 0.17. (0.17 magg, 伪 -0.833 / 0.14) (0.12), and the late type of galaxies are Mrser-21.98 ~ + -0.98 ~ (-0.98) (0.84magg, 伪 -1.5 -0.35). The characteristic stars of the early-type galaxies are darker than those of the latter-type galaxies, The dark side is much flatter than the late type galaxy. The luminosity function of the early type galaxy is concave in the range of -20.5 ~ 20.0 mag. According to the distance from the center of the cluster to the center of the cluster, the dark end of the luminosity function is steeper, according to the distance from the center of the cluster. The brighter the characteristic magnitude.
【作者单位】：常州大学数理学院;青岛科技大学数理学院;南京师范大学物理科学与技术学院;
【基金】：国家自然科学基金项目(11173016)资助
【分类号】：P152

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