SIMBAD references

2016ApJ...827L..19L - Astrophys. J., 827, L19-L19 (2016/August-2)

The relation between stellar and dynamical surface densities in the central regions of disk galaxies.


Abstract (from CDS):

We use the Spitzer Photometry and Accurate Rotation Curves (SPARC) database to study the relation between the central surface density of stars {Σ}_*(0) and dynamical mass {Σ}_{dyn}(0) in 135 disk galaxies (S0 to dIrr). We find that {Σ}_{dyn}(0) correlates tightly with {Σ}_*(0) 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 (LSB) 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.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): dark matter - galaxies: dwarf - galaxies: irregular - galaxies: kinematics and dynamics - galaxies: spiral - galaxies: structure - galaxies: structure

VizieR on-line data: <Available at CDS (J/ApJ/827/L19): figure2.dat>

Simbad objects: 135

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2016ApJ...827L..19L and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact