THE SAMI GALAXY SURVEY: TOWARD A UNIFIED DYNAMICAL SCALING RELATION for GALAXIES of ALL TYPES ...

We take advantage of the first data from the Sydney-AAO Multi-object Integral field Galaxy Survey to investigate the relation between the kinematics of gas and stars, and stellar mass in a comprehensive sample of nearby galaxies. We find that all 235 objects in our sample, regardless of their morpho...

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Main Authors: Cortese, Luca, Fogarty, L. M. R., Ho, I.-T., Bekki, K., Bland-Hawthorn, J., Colless, M., Couch, Warrick, Croom, S. M., Glazebrook, Karl, Mould, Jeremy, Scott, N., Sharp, R., Tonini, C., Allen, J. T., Bloom, J., Bryant, J. J., Cluver, Michelle, Davies, R. L., Drinkwater, M. J., Goodwin, M., Green, A., Kewley, L. J., Kostantopoulos, I. S., Lawrence, J. S., Mahajan, S., Medling, A. M., Owers, M., Richards, S. N., Sweet, Sarah, Wong, O. I.
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Published: Swinburne 2024
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Online Access:https://dx.doi.org/10.25916/sut.26242433.v1
https://figshare.swinburne.edu.au/articles/journal_contribution/THE_SAMI_GALAXY_SURVEY_TOWARD_A_UNIFIED_DYNAMICAL_SCALING_RELATION_for_GALAXIES_of_ALL_TYPES/26242433/1
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Summary:We take advantage of the first data from the Sydney-AAO Multi-object Integral field Galaxy Survey to investigate the relation between the kinematics of gas and stars, and stellar mass in a comprehensive sample of nearby galaxies. We find that all 235 objects in our sample, regardless of their morphology, lie on a tight relation linking stellar mass (M∗) to internal velocity quantified by the S0.5 parameter, which combines the contribution of both dispersion (σ) and rotational velocity (Vrot) to the dynamical support of a galaxy (S0.5 = √ 0.5 Vrot2 + σ2). Our results are independent of the baryonic component from which σ and V rot are estimated, as the S 0.5 of stars and gas agree remarkably well. This represents a significant improvement compared to the canonical M∗ versus Vrot and M∗ versus σ relations. Not only is no sample pruning necessary, but also stellar and gas kinematics can be used simultaneously, as the effect of asymmetric drift is taken into account once Vrot and σ are combined. Our findings ...