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The intricate link between galaxy dynamics and intrinsic shape (or why so-called prolate rotation is a misnomer)

Published online by Cambridge University Press:  14 May 2020

Caroline Foster Open the ORCID record for Caroline Foster [Opens in a new window]  and
Robert Bassett
Caroline Foster
Affiliation:
Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, NSW, 2006, Australia email: caroline.foster@sydney.edu.au ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)
Robert Bassett
Affiliation:
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn VIC 3122, Australia email: rbassett@swin.edu.au
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Abstract

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Many recent integral field spectroscopy (IFS) survey teams have used stellar kinematic maps combined with imaging to statistically infer the underlying distributions of galaxy intrinsic shapes. With now several IFS samples at our disposal, the method, which was originally proposed by M. Franx and collaborators in 1991, is gaining in popularity, having been so far applied to ATLAS3D, SAMI, MANGA and MASSIVE. We present results showing that a commonly assumed relationship between dynamical and intrinsic shape alignment does not hold in Illustris, affecting our ability to recover accurate intrinsic shape distributions. A further implication is that so-called “prolate rotation”, where the bulk of stars in prolate galaxies are thought to rotate around the projected major axis, is a misnomer.

Keywords

galaxies: kinematics and dynamicsgalaxies: structuregalaxies: statisticsgalaxies: fundamental parameters (intrinsic shape)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S353: Galactic Dynamics in the Era of Large Surveys , June 2019 , pp. 222 - 225
Copyright
© International Astronomical Union 2020

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