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

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Rawlings , A , Foster , C , van de Sande , J , Taranu , D S , Croom , S M , Bland-Hawthorn , J , Brough , S , Bryant , J J , Colless , M , Lagos , C D P , Konstantopoulos , I S , Lawrence , J S , Lopez-Sanchez , A R , Lorente , N P F , Medling , A M , Oh , S , Owers , M S , Richards , S N , Scott , N , Sweet , S M & 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 , vol. 491 , no. 1 , pp. 324-343 .

Title: The SAMI Galaxy Survey : rules of behaviour for spin-ellipticity radial tracks in galaxies
Author: Rawlings, Alexander; Foster, Caroline; van de Sande, Jesse; Taranu, Dan S.; Croom, Scott M.; Bland-Hawthorn, Joss; Brough, Sarah; Bryant, Julia J.; Colless, Matthew; Lagos, Claudia del P.; Konstantopoulos, Iraklis S.; Lawrence, Jon S.; Lopez-Sanchez, Angel R.; Lorente, Nuria P. F.; Medling, Anne M.; Oh, Sree; Owers, Matt S.; Richards, Samuel N.; Scott, Nicholas; Sweet, Sarah M.; Yi, Sukyoung K.
Contributor organization: Particle Physics and Astrophysics
Department of Physics
Date: 2020-01
Language: eng
Number of pages: 20
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
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 2 sigma 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.
Subject: galaxies: kinematics and dynamics
galaxies: photometry
galaxies: structure
115 Astronomy, Space science
Peer reviewed: Yes
Rights: cc_by_nc_sa
Usage restriction: openAccess
Self-archived version: publishedVersion

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