Cosmological Simulations of Dwarf Galaxies with Cosmic Ray Feedback

Abstract

We perform zoom-in cosmological simulations of a suite of dwarf galaxies, examining the impact of cosmic-rays generated by supernovae, including the effect of diffusion. We first look at the effect of varying the uncertain cosmic ray parameters by repeatedly simulating a single galaxy. Then we fix the comic ray model and simulate five dwarf systems with virial masses range from 8-30 $\times 10^{10}$ Msun. We find that including cosmic ray feedback (with diffusion) consistently leads to disk dominated systems with relatively flat rotation curves and constant star formation rates. In contrast, our purely thermal feedback case results in a hot stellar system and bursty star formation. The CR simulations very well match the observed baryonic Tully-Fisher relation, but have a lower gas fraction than in real systems. We also find that the dark matter cores of the CR feedback galaxies are cuspy, while the purely thermal feedback case results in a substantial core.

11 pages, 10 figures, MNRAS in press

References in corpus (13)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
• Forming Disk Galaxies in Lambda CDM Simulations
• Mass, Metal, and Energy Feedback in Cosmological Simulations
• The star formation main sequence and stellar mass assembly of galaxies in the Illustris simulation
• Cosmic ray feedback in hydrodynamical simulations of galaxy formation
• Breathing in Low Mass Galaxies: A Study of Episodic Star Formation
• Metal Cooling in Simulations of Cosmic Structure Formation
• Numerical Studies of Diffusive Shock Acceleration at Spherical Shocks
• The effect of feedback and reionization on star formation in low-mass dwarf galaxy haloes
• Cosmological simulations of galaxy formation with cosmic rays

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