The SAMI Galaxy Survey: rules of behaviour for spin-ellipticity radial tracks in galaxies

Alexander Rawlings; Caroline Foster; Jesse van de Sande; Dan S. Taranu; Scott M. Croom; Joss Bland-Hawthorn; Sarah Brough; Julia J. Bryant; Matthew Colless; Claudia P. Del Lagos; Iraklis S. Konstantopoulos; Jon S. Lawrence; Ángel R. López-Sánchez; Nuria P.F. Lorente; Anne M. Medling; Sree Oh; Matt S. Owers; Samuel N. Richards; Nicholas Scott; Sarah M. Sweet; Sukyoung K. Yi

doi:10.1093/mnras/stz2797

The SAMI Galaxy Survey: rules of behaviour for spin-ellipticity radial tracks in galaxies

Alexander Rawlings^*, Caroline Foster, Jesse van de Sande, Dan S. Taranu, Scott M. Croom, Joss Bland-Hawthorn, Sarah Brough, Julia J. Bryant, Matthew Colless, Claudia P. Del Lagos, Iraklis S. Konstantopoulos, Jon S. Lawrence, Ángel R. López-Sánchez, Nuria P.F. Lorente, Anne M. Medling, Sree Oh, Matt S. Owers, Samuel N. Richards, Nicholas Scott, Sarah M. SweetSukyoung K. Yi

^*Corresponding author for this work

Australian Astronomical Optics

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Abstract

We study the behaviour of the spin-ellipticity radial tracks for 507 galaxies from the Sydney AAO Multiobject Integral Field (SAMI) Galaxy Survey with stellar kinematics out to ≥1.5R_e. We advocate for a morpho-dynamical classification of galaxies, relying on spatially resolved photometric and kinematic data. We find the use of spin-ellipticity radial tracks is valuable in identifying substructures within a galaxy, including embedded and counter-rotating discs, that are easily missed in unilateral studies of the photometry alone. Conversely, bars are rarely apparent in the stellar kinematics but are readily identified on images. Consequently, we distinguish the spin-ellipticity radial tracks of seven morpho-dynamical types: elliptical, lenticular, early spiral, late spiral, barred spiral, embedded disc, and 2σ galaxies. The importance of probing beyond the inner radii of galaxies is highlighted by the characteristics of galactic features in the spin-ellipticity radial tracks present at larger radii. The density of information presented through spin-ellipticity radial tracks emphasizes a clear advantage to representing galaxies as a track, rather than a single point, in spin-ellipticity parameter space.

Original language	English
Pages (from-to)	324-343
Number of pages	20
Journal	Monthly Notices of the Royal Astronomical Society
Volume	491
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stz2797
Publication status	Published - 1 Jan 2020

Bibliographical note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 491, Issue 1, January 2020, Pages 324–343, https://doi.org/10.1093/mnras/stz2797. Copyright 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Keywords

Galaxies: kinematics and dynamics
Galaxies: photometry
Galaxies: structure

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10.1093/mnras/stz2797

Publisher version (open access)Final published version, 7.38 MBLicence: Other

Cite this

Rawlings, A., Foster, C., van de Sande, J., Taranu, D. S., Croom, S. M., Bland-Hawthorn, J., Brough, S., Bryant, J. J., Colless, M., Del Lagos, C. P., Konstantopoulos, I. S., Lawrence, J. S., López-Sánchez, Á. R., Lorente, N. P. F., Medling, A. M., Oh, S., Owers, M. S., Richards, S. N., Scott, N., ... Yi, S. K. (2020). The SAMI Galaxy Survey: rules of behaviour for spin-ellipticity radial tracks in galaxies. Monthly Notices of the Royal Astronomical Society, 491(1), 324-343. https://doi.org/10.1093/mnras/stz2797

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title = "The SAMI Galaxy Survey: rules of behaviour for spin-ellipticity radial tracks in galaxies",

abstract = "We study the behaviour of the spin-ellipticity radial tracks for 507 galaxies from the Sydney AAO Multiobject Integral Field (SAMI) Galaxy Survey with stellar kinematics out to ≥1.5Re. We advocate for a morpho-dynamical classification of galaxies, relying on spatially resolved photometric and kinematic data. We find the use of spin-ellipticity radial tracks is valuable in identifying substructures within a galaxy, including embedded and counter-rotating discs, that are easily missed in unilateral studies of the photometry alone. Conversely, bars are rarely apparent in the stellar kinematics but are readily identified on images. Consequently, we distinguish the spin-ellipticity radial tracks of seven morpho-dynamical types: elliptical, lenticular, early spiral, late spiral, barred spiral, embedded disc, and 2σ galaxies. The importance of probing beyond the inner radii of galaxies is highlighted by the characteristics of galactic features in the spin-ellipticity radial tracks present at larger radii. The density of information presented through spin-ellipticity radial tracks emphasizes a clear advantage to representing galaxies as a track, rather than a single point, in spin-ellipticity parameter space.",

keywords = "Galaxies: kinematics and dynamics, Galaxies: photometry, Galaxies: structure",

author = "Alexander Rawlings and Caroline Foster and {van de Sande}, Jesse and Taranu, {Dan S.} and Croom, {Scott M.} and Joss Bland-Hawthorn and Sarah Brough and Bryant, {Julia J.} and Matthew Colless and {Del Lagos}, {Claudia P.} and Konstantopoulos, {Iraklis S.} and Lawrence, {Jon S.} and L{\'o}pez-S{\'a}nchez, {{\'A}ngel R.} and Lorente, {Nuria P.F.} and Medling, {Anne M.} and Sree Oh and Owers, {Matt S.} and Richards, {Samuel N.} and Nicholas Scott and Sweet, {Sarah M.} and Yi, {Sukyoung K.}",

note = "This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 491, Issue 1, January 2020, Pages 324–343, https://doi.org/10.1093/mnras/stz2797. Copyright 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.",

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Rawlings, A, Foster, C, van de Sande, J, Taranu, DS, Croom, SM, Bland-Hawthorn, J, Brough, S, Bryant, JJ, Colless, M, Del Lagos, CP, Konstantopoulos, IS, Lawrence, JS , López-Sánchez, ÁR , Lorente, NPF, Medling, AM, Oh, S, Owers, MS, Richards, SN, Scott, N, Sweet, SM & Yi, SK 2020, 'The SAMI Galaxy Survey: rules of behaviour for spin-ellipticity radial tracks in galaxies', Monthly Notices of the Royal Astronomical Society, vol. 491, no. 1, pp. 324-343. https://doi.org/10.1093/mnras/stz2797

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T2 - rules of behaviour for spin-ellipticity radial tracks in galaxies

AU - Rawlings, Alexander

AU - Foster, Caroline

AU - van de Sande, Jesse

AU - Taranu, Dan S.

AU - Croom, Scott M.

AU - Bland-Hawthorn, Joss

AU - Brough, Sarah

AU - Bryant, Julia J.

AU - Colless, Matthew

AU - Del Lagos, Claudia P.

AU - Konstantopoulos, Iraklis S.

AU - Lawrence, Jon S.

AU - López-Sánchez, Ángel R.

AU - Lorente, Nuria P.F.

AU - Medling, Anne M.

AU - Oh, Sree

AU - Owers, Matt S.

AU - Richards, Samuel N.

AU - Scott, Nicholas

AU - Sweet, Sarah M.

AU - Yi, Sukyoung K.

N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 491, Issue 1, January 2020, Pages 324–343, https://doi.org/10.1093/mnras/stz2797. Copyright 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

PY - 2020/1/1

Y1 - 2020/1/1

N2 - We study the behaviour of the spin-ellipticity radial tracks for 507 galaxies from the Sydney AAO Multiobject Integral Field (SAMI) Galaxy Survey with stellar kinematics out to ≥1.5Re. We advocate for a morpho-dynamical classification of galaxies, relying on spatially resolved photometric and kinematic data. We find the use of spin-ellipticity radial tracks is valuable in identifying substructures within a galaxy, including embedded and counter-rotating discs, that are easily missed in unilateral studies of the photometry alone. Conversely, bars are rarely apparent in the stellar kinematics but are readily identified on images. Consequently, we distinguish the spin-ellipticity radial tracks of seven morpho-dynamical types: elliptical, lenticular, early spiral, late spiral, barred spiral, embedded disc, and 2σ galaxies. The importance of probing beyond the inner radii of galaxies is highlighted by the characteristics of galactic features in the spin-ellipticity radial tracks present at larger radii. The density of information presented through spin-ellipticity radial tracks emphasizes a clear advantage to representing galaxies as a track, rather than a single point, in spin-ellipticity parameter space.

AB - We study the behaviour of the spin-ellipticity radial tracks for 507 galaxies from the Sydney AAO Multiobject Integral Field (SAMI) Galaxy Survey with stellar kinematics out to ≥1.5Re. We advocate for a morpho-dynamical classification of galaxies, relying on spatially resolved photometric and kinematic data. We find the use of spin-ellipticity radial tracks is valuable in identifying substructures within a galaxy, including embedded and counter-rotating discs, that are easily missed in unilateral studies of the photometry alone. Conversely, bars are rarely apparent in the stellar kinematics but are readily identified on images. Consequently, we distinguish the spin-ellipticity radial tracks of seven morpho-dynamical types: elliptical, lenticular, early spiral, late spiral, barred spiral, embedded disc, and 2σ galaxies. The importance of probing beyond the inner radii of galaxies is highlighted by the characteristics of galactic features in the spin-ellipticity radial tracks present at larger radii. The density of information presented through spin-ellipticity radial tracks emphasizes a clear advantage to representing galaxies as a track, rather than a single point, in spin-ellipticity parameter space.

KW - Galaxies: kinematics and dynamics

KW - Galaxies: photometry

KW - Galaxies: structure

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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The SAMI Galaxy Survey: rules of behaviour for spin-ellipticity radial tracks in galaxies

Abstract

Bibliographical note

Keywords

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The impact of impact: what stops star formation in cluster galaxies?

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The SAMI Galaxy Survey: rules of behaviour for spin-ellipticity radial tracks in galaxies

Abstract

Bibliographical note

Keywords

Access to Document

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The impact of impact: what stops star formation in cluster galaxies?

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