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Title:
The cosmic assembly of stellar haloes in massive early-type Galaxies
Authors:
Buitrago, Fernando; Trujillo, Ignacio; Curtis-Lake, Emma; Montes, Mireia; Cooper, Andrew P.; Bruce, Victoria A.; Pérez-González, Pablo G.; Cirasuolo, Michele
Affiliation:
AA(SUPA<xref ref-type="fn" rid="fn1">†</xref>, Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK; Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, OAL, Tapada da Ajuda, P-1349-018 Lisbon, Portugal; Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Edifício C8, Campo Grande, P-1749-016 Lisbon, Portugal), AB(Instituto de Astrofísica de Canarias, Vía Láctea s\n, E-38200 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain), AC(SUPA<xref ref-type="fn" rid="fn1">†</xref>, Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK; Sorbonne Universités, UPMC-CNRS, UMR7095, Institut d'Astrophysique de Paris, F-75014 Paris, France), AD(Department of Astronomy, Yale University, New Haven, CT 06511, USA), AE(Institute for Computational Cosmology, DH1 3LE Durham, UK), AF(SUPA<xref ref-type="fn" rid="fn1">†</xref>, Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK), AG(Departamento de Astrofísica, Facultad de CC. Físicas, Universidad Complutense de Madrid, E-28040 Madrid, Spain), AH(European Southern Observatory Karl-Schwarzschild-Strasse 2, D-85748 Garching bei Muenchen, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 466, Issue 4, p.4888-4903 (MNRAS Homepage)
Publication Date:
04/2017
Origin:
OUP
Astronomy Keywords:
galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: haloes, galaxies: high-redshift, galaxies: structure
Abstract Copyright:
2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stw3382
Bibliographic Code:
2017MNRAS.466.4888B

Abstract

Using the exquisite depth of the Hubble Ultra Deep Field (HUDF12 programme) data set, we explore the ongoing assembly of the outermost regions of the most massive galaxies (Mstellar >= 5× 1010 M&sun;) at z <= 1. The outskirts of massive objects, particularly early-type Galaxies (ETGs), are expected to suffer a dramatic transformation across cosmic time due to continuous accretion of small galaxies. HUDF imaging allows us to study this process at intermediate redshifts in six massive galaxies, exploring the individual surface brightness profiles out to ˜25 effective radii. We find that 5-20 per cent of the total stellar mass for the galaxies in our sample is contained within 10 < R < 50 kpc. These values are in close agreement with numerical simulations, and higher than those reported for local late-type galaxies (≲5 per cent). The fraction of stellar mass stored in the outer envelopes/haloes of massive ETGs increases with decreasing redshift, being 28.7 per cent at <z > = 0.1, 15.1 per cent at <z > = 0.65 and 3.5 per cent at <z > = 2. The fraction of mass in diffuse features linked with ongoing minor merger events is >1-2 per cent, very similar to predictions based on observed close pair counts. Therefore, the results for our small albeit meaningful sample suggest that the size and mass growth of the most massive galaxies have been solely driven by minor and major merging from z = 1 to today.
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