The SAMI Galaxy Survey: mass-kinematics scaling relations

Dilyar Barat, Francesco D'Eugenio, Matthew Colless, Sarah Brough, Barbara Catinella, Luca Cortese, Scott M. Croom, Anne M. Medling, Sree Oh, Jesse Van De Sande, Sarah M. Sweet, Sukyoung K. Yi, Joss Bland-Hawthorn, Julia Bryant, Michael Goodwin, Brent Groves, Jon Lawrence, Matt S. Owers, Samuel N. Richards, Nicholas Scott

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
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Abstract

We use data from the Sydney-AAO Multi-object Integral-field spectroscopy (SAMI) Galaxy Survey to study the dynamical scaling relation between galaxy stellar mass M and the general kinematic parameter SK = √KV2rot + σ2 that combines rotation velocity Vrot and velocity dispersion σ. We show that the logM - logSK relation: (1) is linear above limits set by properties of the samples and observations; (2) has slightly different slope when derived from stellar or gas kinematic measurements; (3) applies to both early-type and late-type galaxies and has smaller scatter than either the Tully.Fisher relation (logM - log Vrot) for late types or the Faber.Jackson relation (logM - log σ) for early types; and (4) has scatter that is only weakly sensitive to the value of K, with minimum scatter for K in the range 0.4 and 0.7. We compare SK to the aperture second moment (the 'aperture velocity dispersion') measured from the integrated spectrum within a 3-arcsecond radius aperture (σ3″ ). We find that while SK and σ3″ are in general tightly correlated, the logM - log SK relation has less scatter than the logM - log σ3″ relation.

Original languageEnglish
Pages (from-to)2924-2936
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume487
Issue number2
DOIs
Publication statusPublished - Aug 2019

Bibliographical note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, Volume 487, Issue 2, August 2019, Pages 2924–2936, https://doi.org/10.1093/mnras/stz1439. Copyright 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Keywords

  • Galaxy stellar content
  • Galaxy structure
  • Galaxy: kinematics and dynamics

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