The star-formation histories of early-type galaxies from ATLAS3D

被引：0

作者：

McDermid, Richard M. ^{[1
]}

Alatalo, Katherine ^{[2
]}

Blitz, Leo ^{[2
]}

Bois, Maxime ^{[3
]}

Bournaud, Frederic ^{[4
]}

Bureau, Martin ^{[5
]}

Cappellari, Michele ^{[5
]}

Crocker, Alison F. ^{[6
]}

Davies, Roger L. ^{[5
]}

Davis, Tim A. ^{[7
]}

de Zeeuw, P. T. ^{[7
,8
]}

Duc, Pierre-Alain ^{[4
]}

Emsellem, Eric ^{[7
,9
]}

Khochfar, Sadegh ^{[10
]}

Krajnovic, Davor

Kuntschner, Harald ^{[7
]}

Lablanche, Pierre-Yves ^{[7
,9
]}

Morganti, Rafaella ^{[11
,12
]}

Naab, Thorsten ^{[13
]}

Oosterloo, Tom ^{[11
,12
]}

Sarzi, Marc ^{[14
]}

Scott, Nic ^{[15
]}

Serra, Paolo ^{[11
]}

Weijmans, Anne-Marie ^{[16
]}

Young, Lisa M. ^{[17
]}

机构：

[1] Gemini North Observ, Hilo, HI 96720 USA

[2] Univ Calif Berkeley, Berkeley, CA 94720 USA

[3] Observ Paris, Paris, France

[4] Lab AIM Paris Saclay, Gif Sur Yvette, France

[5] Univ Oxford, Oxford, England

[6] Univ Massachusetts, Amherst, MA 01003 USA

[7] European Southern Observ, Garching, Germany

[8] Sterrewacht Leiden, Leiden, Netherlands

[9] Observ Lyon, St Genis Laval, France

[10] Max Planck Inst Extraterr Phys, Garching, Germany

[11] Netherlands Inst Radio Astron ASTRON, Dwingeloo, Netherlands

[12] Univ Groningen, Groningen, Netherlands

[13] Max Planck Inst Astrophys, Garching, Germany

[14] Univ Hertfordshire, Hatfield, Herts, England

[15] Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic, Australia

[16] Dunlap Inst Astron Astrophys, Toronto, ON, Canada

[17] New Mexico Inst Min & Technol, Socorro, NM 87801 USA

来源：

SPECTRAL ENERGY DISTRIBUTION OF GALAXIES | 2012年 / 284期

关键词：

galaxies: elliptical and lenticular; cD; evolution; formation; stellar content; STELLAR POPULATION SYNTHESIS;

D O I：

10.1017/S1743921312009167

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an exploration of the integrated stellar populations of early-type galaxies (ETGs) from the ATLAS(3D) survey. We use two approaches: firstly the application of line-indices interpreted through single stellar population (SSP) models, which provide a single value of age, metallicity and abundance ratio. And secondly, by fitting a linear combination of SSP spectra to our data, smoothly weighted in the free parameters of age and metallicity, thereby inferring a star-formation history of these galaxies. Despite the significant differences in these approaches, we obtain generally consistent results, such that galaxies that are more massive appear older with enhanced abundance ratios using line indices, and have shorter star-formation histories weighted to early times. We highlight two limitations of the index-SSP approach. Firstly the SSP-equivalent ages belie the fact that ETGs are overwhelmingly composed of ancient stars. Secondly, the young stellar contributions implied in our star formation histories are required to obtain realistic UV-optical colours. We remark that, even fitting solar-abundance models, we can recover a star-formation duration that correlates with the measured alpha-enhancement, in agreement with other recent work.

引用

页码：244 / +

页数：2

共 6 条

[1] Stellar population synthesis at the resolution of 2003 [J].