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

    Research output: Contribution to journalReview articlepeer-review

    5 Citations (Scopus)


    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.

    Original languageEnglish
    Pages (from-to)324-343
    Number of pages20
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number1
    Publication statusPublished - 1 Jan 2020


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