The SAMI Galaxy Survey: mass–kinematics scaling relations

• Published in: Monthly Notices of the Royal Astronomical Society
• Main Authors: Barat, Dilyar, D’Eugenio, Francesco, Colless, Matthew, Brough, Sarah, Catinella, Barbara, Cortese, Luca, Croom, Scott M., Medling, Anne M., Oh, Sree, van de Sande, Jesse, Sweet, Sarah M., Yi, Sukyoung K., Bland-Hawthorn, Joss, Bryant, Julia, Goodwin, Michael, Groves, Brent, Lawrence, Jon, Owers, Matt S., Richards, Samuel N., Scott, Nicholas
• Other Authors: Swinburne University of Technology
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Oxford University Press (OUP) 2019
• Subjects: sami
• Online Access: http://hdl.handle.net/1959.3/450772; https://doi.org/10.1093/mnras/stz1439

We use data from the Sydney-AAO Multi-object Integral-field spectroscopy (SAMI) Galaxy Survey to study the dynamical scaling relation between galaxy stellar massM* and the general kinematic parameter S-K = root KVrot2 + sigma(2) that combines rotation velocity V-rot and velocity dispersion s. 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 V-rot) for late types or the Faber-Jackson relation (logM(*) - log s) 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 (sigma(3)"). We find that while SK and sigma(3)" are in general tightly correlated, the logM(*) -log SK relation has less scatter than the logM(*)-log sigma(3)" relation.