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Reconstructing the mass accretion histories of nearby red nuggets with their globular cluster systems

Published online by Cambridge University Press:  29 March 2021

Michael A. Beasley Open the ORCID record for Michael A. Beasley [Opens in a new window] ,
Ryan Leaman ,
Ignacio Trujillo ,
Mireia Montes ,
Alejandro Vazdekis Open the ORCID record for Alejandro Vazdekis [Opens in a new window] ,
Núria Salvador Rusiñol ,
Elham Eftekhari ,
Anna Ferré-Mateu  and
Ignacio Martín-Navarro
Michael A. Beasley
Affiliation:
Instituto de Astrofísica de Canarias, c/ Vía Láctea s/n, E-38250, La Laguna, Tenerife, Spain email: [email protected] Departamento de Astrofísica, Universidad de La Laguna, E-38205, Tenerife, Spain
Ryan Leaman
Affiliation:
Max-Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
Ignacio Trujillo
Affiliation:
Instituto de Astrofísica de Canarias, c/ Vía Láctea s/n, E-38250, La Laguna, Tenerife, Spain email: [email protected] Departamento de Astrofísica, Universidad de La Laguna, E-38205, Tenerife, Spain
Mireia Montes
Affiliation:
School of Physics, University of New South Wales, 2052, Sydney, Australia
Alejandro Vazdekis
Affiliation:
Instituto de Astrofísica de Canarias, c/ Vía Láctea s/n, E-38250, La Laguna, Tenerife, Spain email: [email protected] Departamento de Astrofísica, Universidad de La Laguna, E-38205, Tenerife, Spain
Núria Salvador Rusiñol
Affiliation:
Instituto de Astrofísica de Canarias, c/ Vía Láctea s/n, E-38250, La Laguna, Tenerife, Spain email: [email protected] Departamento de Astrofísica, Universidad de La Laguna, E-38205, Tenerife, Spain
Elham Eftekhari
Affiliation:
Instituto de Astrofísica de Canarias, c/ Vía Láctea s/n, E-38250, La Laguna, Tenerife, Spain email: [email protected] Departamento de Astrofísica, Universidad de La Laguna, E-38205, Tenerife, Spain
Anna Ferré-Mateu
Affiliation:
Institut de Ciéncies del Cosmos (ICCUB), Universitat de Barcelona (IEEC-UB), Barcelona 08028, Spain
Ignacio Martín-Navarro
Affiliation:
Instituto de Astrofísica de Canarias, c/ Vía Láctea s/n, E-38250, La Laguna, Tenerife, Spain email: [email protected] Departamento de Astrofísica, Universidad de La Laguna, E-38205, Tenerife, Spain
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Abstract

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It is generally recognized that massive galaxies form through a combination of in-situ collapse and ex-situ accretion. The in-situ component forms early, where gas collapse and compaction leads to the formation of massive compact systems (blue and red “nuggets”) seen at z > 1. The subsequent accretion of satellites brings in ex-situ material, growing these nuggets in size and mass to appear as the massive early-type galaxies (ETGs) we see locally. Due to stochasticity in the accretion process, in a few rare cases a red nugget will evolve to the present day having undergone little ex-situ mass accretion. The resulting massive, compact and ancient objects have been termed “relic galaxies”. Detailed stellar population and kinematic analyses are required to characterise these systems. However, an additional crucial aspect lies in determining the fraction of ex-situ mass they have accreted since their formation. Globular cluster systems can be used to constrain this fraction, since the oldest and most metal-poor globular clusters in massive galaxies are primarily an accreted, ex-situ population. Models for the formation of relic galaxies and their globular cluster systems suggest that, due to their early compaction and limited accretion of dark-matter dominated satellites, relic galaxies should have characteristically low dark-matter mass fractions compared to ETGs of the same stellar mass.

Keywords

galaxies: massiveaccretionevolutiondark matterglobular clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 381 - 385
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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