Radius-dependent Luminosity Evolution of Blue Galaxies in GOODS-N
Radius-dependent Luminosity Evolution of Blue Galaxies in GOODS-N
复制标题
GOODS-N 中蓝色星系的半径相关光度演化
DOI：
10.1086/513134
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
S. Faber
中科院分区：
文献类型：
--
作者：
J. Melbourne;A. Phillips;J. Harker;G. Novak;D. Koo;S. Faber
我们在GOODS-N的凯克团队红移巡天（TKRS）中研究了蓝色星系的半径-光度（R-L）关系。我们与一个体积有限的斯隆数字巡天样本进行比较，发现自z = 1以来，R-L关系已经演变为较低的表面亮度。基于GOODS的探测极限，这不能用低表面亮度星系的不完全性来解释。数密度参数排除了纯半径演化。这可以用b波段光度随时间呈半径依赖性下降来解释。假设MB随z线性移动，我们使用最大似然方法来量化演化。在这些假设下，自z = 1以来，大型（R1/2 > 5 kpc）和中型（3 < R1/2 < 5 kpc）星系经历了ΔMB = 1.53和1.65等的变暗。一个简单的指数下降的恒星形成与电子折叠时间为3gyr可以导致这个数量的变暗。与此同时，小星系，或其中的一些子集，经历了更多的演化，2.55±0.38等。这10倍的光度下降可以用恒星爆发矮系统的子样本来解释，这些子样本迅速褪色，加上爆发强度或频率的下降。在之前的各种研究中，已经发现了处于中间红移的爆发、发光、蓝色、致密星系的样本。如果星系的大小随着时间的推移而增长，那么这些测量值就是光度衰减的上限。
We examine the radius-luminosity (R-L) relation for blue galaxies in the Team Keck Redshift Survey (TKRS) of GOODS-N. We compare with a volume-limited, Sloan Digital Sky Survey sample and find that the R-L relation has evolved to lower surface brightness since z = 1. Based on the detection limits of GOODS, this cannot be explained by incompleteness in low surface brightness galaxies. Number density arguments rule out a pure radius evolution. It can be explained by a radius-dependent decline in B-band luminosity with time. Assuming a linear shift in MB with z, we use a maximum likelihood method to quantify the evolution. Under these assumptions, large (R1/2 > 5 kpc) and intermediate-sized (3 < R1/2 < 5 kpc) galaxies have experienced ΔMB = 1.53 and 1.65 mag of dimming since z = 1. A simple exponential decline in star formation with an e-folding time of 3 Gyr can result in this amount of dimming. Meanwhile, small galaxies, or some subset thereof, have experienced more evolution, 2.55 ± 0.38 mag. This factor of 10 decline in luminosity can be explained by subsamples of starbursting dwarf systems that fade rapidly, coupled with a decline in burst strength or frequency. Samples of bursting, luminous, blue, compact galaxies at intermediate redshifts have been identified by various previous studies. If there has been some growth in galaxy size with time, these measurements are upper limits on luminosity fading.
C.A.诺曼：《天体物理学杂志》。
DOI：
--
发表时间：
--
期刊：
影响因子：
--
作者：
通讯作者：
--