NGC 5626: a massive fast rotator with a twist

S. Viaene; M. Sarzi; M. Baes; I. Puerari

doi:10.1093/mnrasl/slx192

NGC 5626: a massive fast rotator with a twist

S. Viaene, M. Sarzi, M. Baes, I. Puerari

Centre for Astrophysics Research (CAR)

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Abstract

We present a kinematic analysis of the dust-lane elliptical NGC 5626 based on MUSE observations. These data allow us to robustly classify this galaxy as a fast rotator and to infer a virial mass of 10 ^11.7M⊙, making it one of the most massive fast rotators known. In addition, the depth and extent of the MUSE data reveal a strong kinematic twist in the stellar velocity field (by up to 45° beyond 1.5R _e). A comparison with the ATLAS ^3D sample underlines the rareness of this system, although we show that such a large-scale kinematic twist could have been missed by the ATLAS3D data due to the limited spatial sampling of this survey (typically extending to 0.6R _e for massive early-type galaxies). MUSE thus has the potential to unveil more examples of this type of galaxies. We discuss the environment and possible formation history of NGC 5626 and finally argue how a merger between the MilkyWay and Andromeda could produce a galaxy of the same class as NGC 5626.

Original language	English
Pages (from-to)	L47-L51
Journal	Monthly Notices of the Royal Astronomical Society
Volume	474
Issue number	1
Early online date	25 Nov 2017
DOIs	https://doi.org/10.1093/mnrasl/slx192
Publication status	Published - 11 Feb 2018

Keywords

Galaxies: fundamental parameters
Galaxies: individual: NGC 5626

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10.1093/mnrasl/slx192Licence: Other

1711.08981
© 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Accepted author manuscript, 893 KBLicence: Other

https://arxiv.org/abs/1711.08981Licence: Other

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title = "NGC 5626: a massive fast rotator with a twist",

abstract = "We present a kinematic analysis of the dust-lane elliptical NGC 5626 based on MUSE observations. These data allow us to robustly classify this galaxy as a fast rotator and to infer a virial mass of 10 11.7M⊙, making it one of the most massive fast rotators known. In addition, the depth and extent of the MUSE data reveal a strong kinematic twist in the stellar velocity field (by up to 45° beyond 1.5R e). A comparison with the ATLAS 3D sample underlines the rareness of this system, although we show that such a large-scale kinematic twist could have been missed by the ATLAS3D data due to the limited spatial sampling of this survey (typically extending to 0.6R e for massive early-type galaxies). MUSE thus has the potential to unveil more examples of this type of galaxies. We discuss the environment and possible formation history of NGC 5626 and finally argue how a merger between the MilkyWay and Andromeda could produce a galaxy of the same class as NGC 5626. ",

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author = "S. Viaene and M. Sarzi and M. Baes and I. Puerari",

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doi = "10.1093/mnrasl/slx192",

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T1 - NGC 5626: a massive fast rotator with a twist

AU - Viaene, S.

AU - Sarzi, M.

AU - Baes, M.

AU - Puerari, I.

N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

PY - 2018/2/11

Y1 - 2018/2/11

N2 - We present a kinematic analysis of the dust-lane elliptical NGC 5626 based on MUSE observations. These data allow us to robustly classify this galaxy as a fast rotator and to infer a virial mass of 10 11.7M⊙, making it one of the most massive fast rotators known. In addition, the depth and extent of the MUSE data reveal a strong kinematic twist in the stellar velocity field (by up to 45° beyond 1.5R e). A comparison with the ATLAS 3D sample underlines the rareness of this system, although we show that such a large-scale kinematic twist could have been missed by the ATLAS3D data due to the limited spatial sampling of this survey (typically extending to 0.6R e for massive early-type galaxies). MUSE thus has the potential to unveil more examples of this type of galaxies. We discuss the environment and possible formation history of NGC 5626 and finally argue how a merger between the MilkyWay and Andromeda could produce a galaxy of the same class as NGC 5626.

AB - We present a kinematic analysis of the dust-lane elliptical NGC 5626 based on MUSE observations. These data allow us to robustly classify this galaxy as a fast rotator and to infer a virial mass of 10 11.7M⊙, making it one of the most massive fast rotators known. In addition, the depth and extent of the MUSE data reveal a strong kinematic twist in the stellar velocity field (by up to 45° beyond 1.5R e). A comparison with the ATLAS 3D sample underlines the rareness of this system, although we show that such a large-scale kinematic twist could have been missed by the ATLAS3D data due to the limited spatial sampling of this survey (typically extending to 0.6R e for massive early-type galaxies). MUSE thus has the potential to unveil more examples of this type of galaxies. We discuss the environment and possible formation history of NGC 5626 and finally argue how a merger between the MilkyWay and Andromeda could produce a galaxy of the same class as NGC 5626.

KW - Galaxies: fundamental parameters

KW - Galaxies: individual: NGC 5626

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DO - 10.1093/mnrasl/slx192

M3 - Letter

SN - 0035-8711

VL - 474

SP - L47-L51

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

NGC 5626: a massive fast rotator with a twist

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