Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

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

Eales, Stephen, Fullard, Andrew, Allen, Matthew, Smith, Matthew William L., Baldry, Ivan, Bourne, Nathan, Clark, Christopher Jonathan Redfern, Driver, Simon, Dunne, Loretta, Dye, Simon, Graham, Alister W., Ibar, Edo, Hopkins, Andrew, Ivison, Rob, Kelvin, Lee S., Maddox, Steve, Maraston, Claudia, Robotham, Aaron S. G., Smith, Dan, Taylor, Edward N., Valiante, Elisabetta, Werf, Paul van der, Baes, Maarten, Brough, Sarah, Clements, David, Cooray, Asantha, Gomez, Haley Louise, Loveday, Jon, Phillipps, Steven, Scott, Douglas and Serjeant, Steve 2015. H-ATLAS/GAMA: quantifying the morphological evolution of the galaxy population using cosmic calorimetry. Monthly Notices of the Royal Astronomical Society 452 (4) , pp. 3489-3507. 10.1093/mnras/stv1300

[img]
Preview
PDF - Submitted Pre-Print Version
Download (4MB) | Preview

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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Uncontrolled Keywords: Galaxies: bulges, galaxies: evolution, galaxies: star formation
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 25 April 2017
Date of Acceptance: 9 June 2015
Last Modified: 29 Jun 2019 10:45
URI: http://orca.cf.ac.uk/id/eprint/100103

Citation Data

Cited 7 times in Google Scholar. View in Google Scholar

Cited 7 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item