The evolution of early-type galaxies at z ∼ 1 from the K20 survey

被引：93

作者：

Alighieri, SD

Vernet, J

Cimatti, A

Lanzoni, B

Cassata, P

Ciotti, L

Daddi, E

Mignoli, M

Pignatelli, E

Pozzetti, L

Renzini, A

Rettura, A

Zamorani, G

机构：

[1] Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy

[2] Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy

[3] Univ Padua, Dipartimento Astron, I-35122 Padua, Italy

[4] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy

[5] Natl Opt Astron Observ, Tucson, AZ 85726 USA

[6] Osserv Astron Padova, INAF, I-35122 Padua, Italy

[7] European So Observ, D-85748 Garching, Germany

[8] Univ Paris Sud 11, F-91405 Orsay, France

来源：

ASTRONOMY & ASTROPHYSICS | 2005年 / 442卷 / 01期

关键词：

galaxies : evolution; galaxies : elliptical and lenticular; cD; galaxies : kinematics and dynamics;

D O I：

10.1051/0004-6361:20053168

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have performed VLT spectroscopy of an almost complete sample of 18 early-type galaxies with 0.88 <= z <= 1.3 plus two at z = 0.67, selected from the K20 survey, and derived the velocity dispersion for 15+2 of them. By combining these data with HST and VLT images, we study the Fundamental Plane (FP), the Faber - Jackson and the Kormendy relations at z similar to 1. Compared with the local one, the FP at z similar to 1 has a remarkably small scatter, and shows both an offset and a rotation, which we interpret in terms of evolution of the mass-to-light ratio, and possibly of the size. We give evidence that the evolution rate depends on galaxy mass, being faster for less massive galaxies. We discuss the possible factors driving the evolution of spheroids and compare our results with the predictions of the hierachical models of galaxy formation.

引用

页码：125 / U28

页数：15

共 68 条

[1] The Chandra Deep Field North survey. XIII. 2 Ms point-source catalogs [J].