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

L. Wang, P. Norberg, S. Brough, M. J.I. Brown, E. Da Cunha, L. J. Davies, S. P. Driver, B. W. Holwerda, A. M. Hopkins, M. A. Lara-Lopez, J. Liske, J. Loveday, M. W. Grootes, C. C. Popescu, A. H. Wright

Research output: Contribution to journalArticle

Abstract

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 ∼ 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 ∼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.

Original languageEnglish
Article numberA1
JournalAstronomy and Astrophysics
Volume618
DOIs
Publication statusPublished - 1 Oct 2018

Fingerprint

assembly
galaxies
halos
F stars
stars
stellar mass
star formation rate
galactic clusters
spectral energy distribution
catalogs
star formation
dark matter
dust
modeling
energy

Cite this

Wang, L. ; Norberg, P. ; Brough, S. ; Brown, M. J.I. ; Da Cunha, E. ; Davies, L. J. ; Driver, S. P. ; Holwerda, B. W. ; Hopkins, A. M. ; Lara-Lopez, M. A. ; Liske, J. ; Loveday, J. ; Grootes, M. W. ; Popescu, C. C. ; Wright, A. H. / Galaxy and Mass Assembly (GAMA) : The environmental dependence of the galaxy main sequence. In: Astronomy and Astrophysics. 2018 ; Vol. 618.
@article{0c40c99b154e47958d50a5e1ed0f34df,
title = "Galaxy and Mass Assembly (GAMA): The environmental dependence of the galaxy main sequence",
abstract = "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 ∼ 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 ∼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.",
keywords = "Galaxies: abundances, Galaxies: evolution, Galaxies: groups: general, Galaxies: halos, Galaxies: star formation, Galaxies: statistics",
author = "L. Wang and P. Norberg and S. Brough and Brown, {M. J.I.} and {Da Cunha}, E. and Davies, {L. J.} and Driver, {S. P.} and Holwerda, {B. W.} and Hopkins, {A. M.} and Lara-Lopez, {M. A.} and J. Liske and J. Loveday and Grootes, {M. W.} and Popescu, {C. C.} and Wright, {A. H.}",
year = "2018",
month = "10",
day = "1",
doi = "10.1051/0004-6361/201832697",
language = "English",
volume = "618",
journal = "ASTRONOMY & ASTROPHYSICS",
issn = "0004-6361",
publisher = "EDP SCIENCES S A",

}

Wang, L, Norberg, P, Brough, S, Brown, MJI, Da Cunha, E, Davies, LJ, Driver, SP, Holwerda, BW, Hopkins, AM, Lara-Lopez, MA, Liske, J, Loveday, J, Grootes, MW, Popescu, CC & Wright, AH 2018, 'Galaxy and Mass Assembly (GAMA): The environmental dependence of the galaxy main sequence' Astronomy and Astrophysics, vol. 618, A1. https://doi.org/10.1051/0004-6361/201832697

Galaxy and Mass Assembly (GAMA) : The environmental dependence of the galaxy main sequence. / Wang, L.; Norberg, P.; Brough, S.; Brown, M. J.I.; Da Cunha, E.; Davies, L. J.; Driver, S. P.; Holwerda, B. W.; Hopkins, A. M.; Lara-Lopez, M. A.; Liske, J.; Loveday, J.; Grootes, M. W.; Popescu, C. C.; Wright, A. H.

In: Astronomy and Astrophysics, Vol. 618, A1, 01.10.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Galaxy and Mass Assembly (GAMA)

T2 - The environmental dependence of the galaxy main sequence

AU - Wang, L.

AU - Norberg, P.

AU - Brough, S.

AU - Brown, M. J.I.

AU - Da Cunha, E.

AU - Davies, L. J.

AU - Driver, S. P.

AU - Holwerda, B. W.

AU - Hopkins, A. M.

AU - Lara-Lopez, M. A.

AU - Liske, J.

AU - Loveday, J.

AU - Grootes, M. W.

AU - Popescu, C. C.

AU - Wright, A. H.

PY - 2018/10/1

Y1 - 2018/10/1

N2 - 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 ∼ 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 ∼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.

AB - 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 ∼ 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 ∼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.

KW - Galaxies: abundances

KW - Galaxies: evolution

KW - Galaxies: groups: general

KW - Galaxies: halos

KW - Galaxies: star formation

KW - Galaxies: statistics

UR - http://www.scopus.com/inward/record.url?scp=85055140091&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201832697

DO - 10.1051/0004-6361/201832697

M3 - Article

VL - 618

JO - ASTRONOMY & ASTROPHYSICS

JF - ASTRONOMY & ASTROPHYSICS

SN - 0004-6361

M1 - A1

ER -