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

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posted on 2023-06-09, 01:18 authored by Stephen Eales, Andrew Fullard, Matthew Allen, M W L Smith, Ivan Baldry, Nathan Bourne, C J R Clark, Simon Driver, Loretta Dunne, Simon Dye, Alister W Graham, Edo Ibar, Andrew Hopkins, Rob Ivison, Lee S Kelvin, Steve Maddox, Claudia Maraston, Aaron S G Robotham, Dan Smith, Edward N Taylor, Elisabetta Valiante, Paul van der Werf, Maarten Baes, Sarah Brough, David Clements, Asantha Cooray, Haley Gomez, Jonathan LovedayJonathan Loveday, Steven Phillipps, Douglas Scott, Steve Serjeant
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.

Funding

Astronomy rolling grant; G0278; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I000976/1

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

4

Volume

452

Page range

3489-3507

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-05-19

First Open Access (FOA) Date

2016-05-19

First Compliant Deposit (FCD) Date

2016-05-18

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