The assembly of stellar haloes in massive Early-Type Galaxies

被引：0
作者：
Buitrago, F. [1 ,2 ]
机构：
[1] Univ Lisbon, Inst Astrofis & Ciencias Espaco, OAL, P-1349018 Lisbon, Portugal
[2] Univ Lisbon, Fac Ciencias, Dept Fis, Edificio C8, P-1749016 Lisbon, Portugal
来源：
FORMATION AND EVOLUTION OF GALAXY OUTSKIRTS | 2016年 / 11卷 / S321期
关键词：
galaxies: elliptical and lenticular; cD; galaxies: evolution; galaxies: halos;
D O I：
10.1017/S1743921316011558
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Massive (M-stellar >= 5x10(10) M-circle dot) Early-Type Galaxies (ETGs) must build an outer stellar envelope over cosmic time in order to account for their remarkable size evolution. This is similar to what occurs to nearby Late-Type Galaxies (LTGs), which create their stellar haloes out of the debris of lower mass systems. We analysed the outer parts of massive ETGs at z < 1 by exploiting the Hubble Ultra Deep Field imaging. These galaxies store 10-30% of their stellar mass at distances 10 < R/kpc < 50, in contrast to the low percentages (< 5%) found for LTGs. We find evidence for a progressive outskirt development with redshift driven solely via merging.
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页码：321 / 323
页数：3
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