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, B, Cortese, L, Croom, Scott M, Medling, Anne, Oh, Sree, van de Sande, Jesse, Sweet, Sarah, Yi, Sukyoung K, Bland-Hawthorn, Joss, Bryant, Julia J., Goodwin, Michael, Groves, Brent, Lawrence, Jon
• Format: Article in Journal/Newspaper
• Language: English
• Published: Oxford University Press
• Subjects: Galaxy: kinematics and dynamics; Galaxy stellar content; Galaxy structure; sami
• Online Access: http://hdl.handle.net/1885/264561; https://doi.org/10.1093/mnras/stz1439; https://openresearch-repository.anu.edu.au/bitstream/1885/264561/3/01_Barat_The_SAMI_Galaxy_Survey%253A_2019.pdf.jpg

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 S_K = \sqrt{K V_rot^2 + σ ^2} that combines rotation velocity Vrot and velocity dispersion σ. We show that the log M∗ - log SK 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 (log M∗ - log Vrot) for late types or the Faber-Jackson relation (log M∗ - 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 (σ _{3^' ' }}). We find that while SK and σ _{3^' ' }} are in general tightly correlated, the log M∗ - log SK relation has less scatter than the \log M_* - \log σ _{3^' ' }} relation. The SAMI Galaxy Survey is supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013, the Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), through project number CE110001020, and other participating institutions. The SAMI Galaxy Survey website is samisurvey.org. DB is supported by an Australia Government Research Training Program Scholarship and ASTRO 3D. FDE acknowledges funding through the H2020 ERC Consolidator Grant 683184. JBH is supported by an ARC Laureate Fellowship that funds JvdS and an ARC Federation Fellowship that funded the SAMI prototype. JJB acknowledges support of an Australian Research Council Future Fellowship (FT180100231). JvdS is funded under Bland-Hawthorn’s ARC Laureate Fellowship (FL140100278). NS ...