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 to robustly classify this galaxy as a fast rotator and to infer a virial mass of $10^{11.7}{M}_{\odot }$, 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 $45$ degrees 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 ATLAS${}^{3D}$ data due to the limited spatial sampling of this survey (typically extending to $0.6R_e$ for massive ETGs). 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 Milky Way and Andromeda could produce a galaxy of the same class as NGC 5626.

5 pages, 3 figures, letter accepted for publication in MNRAS

References in corpus (9)

• The MUSE second-generation VLT instrument
• The SAURON project -- IX. A kinematic classification for early-type galaxies
• The SAURON project -- X. The orbital anisotropy of elliptical and lenticular galaxies: revisiting the (V/sigma,epsilon) diagram with integral-field stellar kinematics
• Stellar kinematics across the Hubble sequence in the CALIFA survey: General properties and aperture corrections
• The Atlas3D project - XXIV. The intrinsic shape distribution of early-type galaxies
• The MASSIVE Survey - V. Spatially-Resolved Stellar Angular Momentum, Velocity Dispersion, and Higher Moments of the 41 Most Massive Local Early-Type Galaxies
• The Collision Between The Milky Way And Andromeda
• A kinematically distinct core and minor-axis rotation: the MUSE perspective on M87
• MUSE stares into the shadows: the high-resolution dust attenuation curve of NGC 5626