Near UV Properties of Early-Type Galaxies at z ∼ 1

被引：1
|
作者：
Alighieri, Sperello Di Serego [1 ]
Bressan, Alessandro [2 ]
机构：
[1] INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy
[2] INAF Osservatorio Astron Padova, I-35100 Padua, Italy
来源：
NEW QUESTS IN STELLAR ASTROPHYSICS II: ULTRAVIOLET PROPERTIES OF EVOLVED STELLAR POPULATIONS | 2009年
关键词：
LINE-STRENGTH INDEXES; ELLIPTIC GALAXIES; FORMATION HISTORY; EVOLUTION; ENVIRONMENT;
D O I：
10.1007/978-0-387-87621-4_4
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have used spectral fits to SSP-based atmosphere models to derive an estimate of the average stellar age for an almost complete sample of 15 Early-Type Galaxies (ETC) at 0.88 < z < 1.3. The results are in only partial agreement with the age estimates previously obtained for the same objects from an analysis of the M/L-B ratio, derived from the Fundamental Plane (FP) parameters. In particular spectral fits seem to underestimate the age of the most luminous ETC, and therefore do not reproduce the downsizing effect, which is clear for the FP ages. We also analyse the relationship between the spectral-fit ages and various near-UV spectral indices.
引用
收藏
页码：25 / +
页数：2
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