Galaxy and Mass Assembly (GAMA): The environmental dependence of the galaxy main sequence

被引：16

作者：

Wang, L. ^{[1
,2
,3
,4
]}

Norberg, P. ^{[3
,4
]}

Brough, S. ^{[5
]}

Brown, M. J., I ^{[6
]}

da Cunha, E. ^{[7
]}

Davies, L. J. ^{[8
]}

Driver, S. P. ^{[8
]}

Holwerda, B. W. ^{[9
]}

Hopkins, A. M. ^{[10
]}

Lara-Lopez, M. A. ^{[11
]}

Liske, J. ^{[12
]}

Loveday, J. ^{[13
]}

Grootes, M. W. ^{[14
,15
]}

Popescu, C. C. ^{[16
,17
]}

Wright, A. H. ^{[18
]}

机构：

[1] SRON Netherlands Inst Space Res, Landleven 12, NL-9747 AD Groningen, Netherlands

[2] Univ Groningen, Kapteyn Astron Inst, Postbus 800, NL-9700 AV Groningen, Netherlands

[3] Univ Durham, ICC, Durham DH1 3LE, England

[4] Univ Durham, Dept Phys, CEA, Durham DH1 3LE, England

[5] Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia

[6] Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia

[7] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia

[8] Univ Western Australia, ICRAR, Crawley, WA 6009, Australia

[9] Univ Louisville, Dept Phys & Astron, 102 Nat Sci Bldg, Louisville, KY 40292 USA

[10] Australian Astron Observ, 105 Delhi Rd, N Ryde, NSW 2113, Australia

[11] Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, Juliane Manes Vej 30, DK-2100 Copenhagen, Denmark

[12] Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany

[13] Univ Sussex, Astron Ctr, Brighton BN1 9QH, E Sussex, England

[14] Max Planck Inst Kernphys, Saupfercheckweg 1, D-69117 Heidelberg, Germany

[15] ESA, ESTEC SCI S, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands

[16] Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England

[17] Romanian Acad, Astron Inst, Str Cutitul Argint 5, Bucharest, Romania

[18] Univ Bonn, Argelander Inst Astron, Auf Hugel 71, D-53121 Bonn, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2018年 / 618卷

基金：

英国科学技术设施理事会; 欧洲研究理事会;

关键词：

galaxies: abundances; galaxies: star formation; galaxies: statistics; galaxies: evolution; galaxies: groups: general; galaxies: halos; STAR-FORMATION HISTORY; STELLAR MASS; INFRARED-EMISSION; FORMING GALAXIES; SIMPLE-MODEL; POPULATION; DRIVERS; ZCOSMOS; GROWTH; DUST;

D O I：

10.1051/0004-6361/201832697

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims: We aim to investigate if the environment (characterised by the host dark matter halo mass) plays any role in shaping the galaxy star formation main sequence (MS). Methods: The Galaxy and Mass Assembly project (GAMA) combines a spectroscopic survey with photometric information in 21 bands from the far-ultraviolet (FUV) to the far-infrared (FIR). Stellar masses and dust-corrected star-formation rates (SFR) are derived from spectral energy distribution (SED) modelling using MAGPHYS. We use the GAMA galaxy group catalogue to examine the variation of the fraction of star-forming galaxies (SFG) and properties of the MS with respect to the environment. Results: We examine the environmental dependence for stellar mass selected samples without preselecting star-forming galaxies and study any dependence on the host halo mass separately for centrals and satellites out to z similar to 0.3. We find the SFR distribution at fixed stellar mass can be described by the combination of two Gaussians (referred to as the star-forming Gaussian and the quiescent Gaussian). Using the observed bimodality to define SFG, we investigate how the fraction of SFG F(SFG) and properties of the MS change with environment. For centrals, the position of the MS is similar to the field but with a larger scatter. No significant dependence on halo mass is observed. For satellites, the position of the MS is almost always lower (by similar to 0.2 dex) compared to the field and the width is almost always larger. F(SFG) is similar between centrals (in different halo mass bins) and field galaxies. However, for satellites F(SFG) decreases with increasing halo mass and this dependence is stronger towards lower redshift.

引用

页数：6

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