至z=3.5时蓝带光度函数的演化
摘要
我们给出对4400 Å B波段光度函数（LF）至红移z=3.5的宇宙演化估计。为此目的，我们使用由1541个I选取的星系样本（下限为I_(AB)=27.2）和138个下限为K_(AB)=25的星系样本组成的混合样本，最显著的是来自Sloan数字银河坐标系（SDSS）和哈勃深空域南部（HDF-S）中获得的新深JHK图像，后者使用ESO VLT望远镜上的ISAAC仪器获取。约21%的样本具有光谱红移，剩余部分经良好校准的光度红移。 resulting blue LF shows little density evolution at the faint end with respect to the local values, while at the bright end (M_B(AB)<-20) a brightening increasing with redshift is apparent with respect to the local LF. Hierarchical CDM models overpredict the number of faint galaxies by about a factor 3 at z=1. At the bright end the predicted LFs are in reasonable agreement only at low and intermediate redshifts (z=1), but fail to reproduce the pronounced brightening observed in the high redshift (z=2-3) LF. This brightening could mark the epoch where a major star formation activity is present in the galaxy evolution.
引用
@article{arxiv.astro-ph/0306625,
title = {The evolution of the galaxy luminosity function in the rest frame blue band up to z=3.5},
author = {F. Poli and E. Giallongo and A. Fontana and N. Menci and G. Zamorani and M. Nonino and P. Saracco and E. Vanzella and I. Donnarumma and S. Salimbeni and A. Cimatti and S. Cristiani and E. Daddi and S. D'Odorico and M. Mignoli and L. Pozzetti and A. Renzini},
journal= {arXiv preprint arXiv:astro-ph/0306625},
year = {2009}
}
备注
14 pages, 2 figures, Astrophysical Journal Letters, in press