The Relation between Stellar and Dynamical Surface Densities in the Central Regions of Disk Galaxies

(2) University of Oregon); Federico Lelli (1); James M. Schombert (2); Marcel S. Pawlowski (1) ((1) Case Western Reserve University; Stacy S. McGaugh (1)

The Relation between Stellar and Dynamical Surface Densities in the Central Regions of Disk Galaxies

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arxiv 1607.02145 v1 pith:NLNEVSUZ submitted 2016-07-07 astro-ph.GA astro-ph.CO

The Relation between Stellar and Dynamical Surface Densities in the Central Regions of Disk Galaxies

Federico Lelli (1) , Stacy S. McGaugh (1) , James M. Schombert (2) , Marcel S. Pawlowski (1) ((1) Case Western Reserve University , (2) University of Oregon) This is my paper

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We use the SPARC (Spitzer Photometry & Accurate Rotation Curves) database to study the relation between the central surface density of stars Sstar and dynamical mass Sdyn in 135 disk galaxies (S0 to dIrr). We find that Sdyn correlates tightly with Sstar over 4 dex. This central density relation can be described by a double power law. High surface brightness galaxies are consistent with a 1:1 relation, suggesting that they are self-gravitating and baryon dominated in the inner parts. Low surface brightness galaxies systematically deviate from the 1:1 line, indicating that the dark matter contribution progressively increases but remains tightly coupled to the stellar one. The observed scatter is small (~0.2 dex) and largely driven by observational uncertainties. The residuals show no correlations with other galaxy properties like stellar mass, size, or gas fraction.

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