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H-ATLAS/GAMA: quantifying the morphological evolution of the galaxy population using cosmic calorimetry

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Title: H-ATLAS/GAMA: quantifying the morphological evolution of the galaxy population using cosmic calorimetry
Authors: Eales, S
Fullard, A
Allen, M
Smith, MWL
Baldry, I
Bourne, N
Clark, CJR
Driver, S
Dunne, L
Dye, S
Graham, AW
Ibar, E
Hopkins, A
Ivison, R
Kelvin, LS
Maddox, S
Maraston, C
Robotham, ASG
Smith, D
Taylor, EN
Valiante, E
Van der Werf, P
Baes, M
Brough, S
Clements, D
Cooray, A
Gomez, H
Loveday, J
Phillipps, S
Scott, D
Serjeant, S
Item Type: Journal Article
Abstract: Using results from the Herschel Astrophysical Terrahertz Large-Area Survey (H-ATLAS) and the Galaxy and Mass Assembly (GAMA) project, we show that, for galaxy masses above ≃ 108 M⊙, 51 per cent of the stellar mass-density in the local Universe is in early-type galaxies (ETGs; Sérsic n > 2.5) while 89 per cent of the rate of production of stellar mass-density is occurring in late-type galaxies (LTGs; Sérsic n < 2.5). From this zero-redshift benchmark, we have used a calorimetric technique to quantify the importance of the morphological transformation of galaxies over the history of the Universe. The extragalactic background radiation contains all the energy generated by nuclear fusion in stars since the big bang. By resolving this background radiation into individual galaxies using the deepest far-infrared survey with the Herschel Space Observatory and a deep near-infrared/optical survey with the Hubble Space Telescope (HST), and using measurements of the Sérsic index of these galaxies derived from the HST images, we estimate that ≃83 per cent of the stellar mass-density formed over the history of the Universe occurred in LTGs. The difference between this value and the fraction of the stellar mass-density that is in LTGs today implies there must have been a major transformation of LTGs into ETGs after the formation of most of the stars.
Issue Date: 1-Oct-2015
Date of Acceptance: 9-Jun-2015
URI: http://hdl.handle.net/10044/1/60558
DOI: https://dx.doi.org/10.1093/mnras/stv1300
ISSN: 0035-8711
Publisher: Oxford University Press (OUP)
Start Page: 3489
End Page: 3507
Journal / Book Title: Monthly Notices of the Royal Astronomical Society
Volume: 452
Issue: 4
Copyright Statement: © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council [2006-2012]
Funder's Grant Number: ST/K001051/1
ST/K001051/1
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
galaxies: bulges
galaxies: evolution
galaxies: star formation
MASS ASSEMBLY GAMA
SIMILAR-TO 2
SCIENCE DEMONSTRATION PHASE
STAR-FORMING GALAXIES
DIGITAL SKY SURVEY
HERSCHEL-ATLAS
MU-M
HUBBLE SEQUENCE
DISK GALAXIES
LUMINOSITY FUNCTIONS
0201 Astronomical And Space Sciences
Publication Status: Published
Online Publication Date: 2015-08-05
Appears in Collections:Physics
Astrophysics