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arXiv 0904.3485astro-ph.CO
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Norma聚类(ACO3627):II。近红外K_s波段光度函数

The Norma cluster (ACO3627): II. The near infrared K_s-band luminosity function

R. E. Skelton, P. A. Woudt, R. C. Kraan-Korteweg

摘要:

本文给出了富邻诺玛星系团(ACO 3627)核部星系的K_s波段深测光表。测量范围约为45 * 45平方弧分(略小于阿贝尔半径的1/3),相当于约100平方米。0.8在这个星团采用的70 Mpc的距离(v_cmb/H 0)下,Mpc^2。这次巡天估计完成的星等为M_Ks <~ -19.5等。这延伸到矮区,比M_Ks* 低6等。该目录包含390个天体,其中235个被归类为可能或确定的星系,155个为候选星系。KS波段光度函数(LF)是从光度测量样本中构建的,使用光谱子样本来校正前和背景污染。我们将一个Schechter函数拟合到数据中,其特征量M_Ks* = -25.39 \pm 0.80 mag,弱端斜率α = -1.26 \pm 0.10。LF的形状与以前在光学和近红外线上对LF星系团的测定中发现的形状相似。Schechter参数与最近的场低频一致,表明亮端形状和暗端斜率对环境相对不敏感。

英文摘要:

A deep K_s-band photometric catalogue of galaxies at the core of the rich, nearby Norma cluster (ACO3627) is presented. The survey covers about 45 by 45 square arcmin (slightly less than 1/3 Abell radius), which corresponds to approx. 0.8 Mpc^2 at the adopted distance (v_cmb/H0) of 70 Mpc of this cluster. The survey is estimated to be complete to a magnitude of M_Ks <~ -19.5 mag. This extends into the dwarf regime, 6 magnitudes below M_Ks*. The catalogue contains 390 objects, 235 of which are classified as likely or definite galaxies and 155 as candidate galaxies. The Ks-band luminosity function (LF) is constructed from the photometric sample, using a spectroscopic subsample to correct for fore- and background contamination. We fit a Schechter function with a characteristic magnitude of M_Ks* = -25.39 \pm 0.80 mag and faint-end slope of alpha = -1.26 \pm 0.10 to the data. The shape of the LF is similar to those found in previous determinations of the cluster LF, in both optical and near infrared. The Schechter parameters agree well with those of recent field LFs, suggesting that both the shape of the bright end and the faint end slope are relatively insensitive to environment.

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