The temperature of hot gas in galaxies and clusters: baryons dancing to the tune of dark matter
arXiv:1012.2870 · doi:10.1088/0004-637X/734/1/62
Abstract
The temperature profile of hot gas in galaxies and galaxy clusters is largely determined by the depth of the total gravitational potential and thereby by the dark matter (DM) distribution. We use high-resolution hydrodynamical simulations of galaxy formation to derive a surprisingly simple relation between the gas temperature and DM properties. We show that this relation holds not just for galaxy clusters but also for equilibrated and relaxed galaxies at radii beyond the central stellar-dominated region of typically a few kpc. It is then clarified how a measurement of the temperature and density of the hot gas component can lead to an indirect measurement of the DM velocity anisotropy in galaxies. We also study the temperature relation for galaxy clusters in the presence of self-regulated, recurrent active galactic nuclei (AGN), and demonstrate that this temperature relation even holds outside the inner region of 30 kpc in clusters with an active AGN.
10 pages, 7 figures
References in corpus (17)
- Star Formation and Feedback in Smoothed Particle Hydrodynamic Simulations--I. Isolated Galaxies
- Forming Disk Galaxies in Lambda CDM Simulations
- Erasing Dark Matter Cusps in Cosmological Galactic Halos with Baryons
- Dissecting Galaxy Formation: I. Comparison Between Pure Dark Matter and Baryonic Models
- Subgrid Modeling of AGN-Driven Turbulence in Galaxy Clusters
- The evolution of clusters in the CLEF cosmological simulation: X-ray structural and scaling properties
- Disk Evolution and Bar Triggering Driven by Interactions with Dark Matter Substructure
- Structure Formation Inside Triaxial Dark Matter Halos: Galactic Disks, Bulges and Bars
- The impact of going beyond the Maxwell distribution in direct dark matter detection rates
- Evolution of X-ray cavities
- Entropy profiles in X-ray luminous galaxy clusters at z>0.1
- Entropy of gas and dark matter in galaxy clusters
- Measurement of the dark matter velocity anisotropy in galaxy clusters
- X-ray temperature spectroscopy of simulated cooling clusters
- Comparing galactic satellite properties in hydrodynamical and Nbody simulations
- Measuring the dark matter velocity anisotropy in galaxy clusters
- What it takes to measure a fundamental difference between dark matter and baryons: the halo velocity anisotropy
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- Estimating the dark matter velocity anisotropy to the cluster edge
- An attractor for the dynamical state of the intracluster medium