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The quest for relics: Massive compact galaxies in the local Universe

Published online by Cambridge University Press:  04 June 2020

A. Schnorr-Müller Open the ORCID record for A. Schnorr-Müller [Opens in a new window] ,
M. Trevisan ,
F. S. Lohmann ,
N. Mallmann ,
R. Riffel ,
A. Chies-Santos  and
C. Furlanetto
A. Schnorr-Müller
Affiliation:
Astronomy Department, Universidade Federal do Rio Grande do Sul, Brazil
M. Trevisan
Affiliation:
Astronomy Department, Universidade Federal do Rio Grande do Sul, Brazil
F. S. Lohmann
Affiliation:
Astronomy Department, Universidade Federal do Rio Grande do Sul, Brazil
N. Mallmann
Affiliation:
Astronomy Department, Universidade Federal do Rio Grande do Sul, Brazil
R. Riffel
Affiliation:
Astronomy Department, Universidade Federal do Rio Grande do Sul, Brazil
A. Chies-Santos
Affiliation:
Astronomy Department, Universidade Federal do Rio Grande do Sul, Brazil
C. Furlanetto
Affiliation:
Physics Department, Universidade Federal do Rio Grande do Sul, Brazil
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Abstract

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In the local Universe there exists a rare population of compact galaxies resembling the high-redshift quiescent population in mass and size. It has been found that some of these objects have survived largely unchanged since their formation at high-z. They are called relic galaxies. With the goal of finding relic galaxies, we searched the SDSS-MaNGA DR15 release for massive compact galaxies. We find that massive compact galaxies are mostly composed of old, metal-rich and alpha enhanced stellar populations. In terms of kinematics, massive compact galaxies show ordered rotation in their velocity fields and σ* profiles rising towards the center. They are predominantly fast rotators and show increased rotational support when compared to a mass-matched control sample of average-sized early-type galaxies. These properties are consistent with these objects being relic galaxies. However, to confirm their relic status, we need to probe larger radii (⪎3Re) than probed with the current data.

Keywords

galaxies: evolutiongalaxies: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S352: Uncovering Early Galaxy Evolution in the ALMA and JWST Era , June 2019 , pp. 320 - 321
Copyright
© International Astronomical Union 2020

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