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The baryon cycle of Seven Dwarfs with superbubble feedback
- Publication Year :
- 2020
- Publisher :
- arXiv, 2020.
-
Abstract
- We present results from a high-resolution, cosmological, $\Lambda$CDM simulation of a group of field dwarf galaxies with the "superbubble" model for clustered SN feedback, accounting for thermal conduction and cold gas evaporation. The initial conditions and the galaxy formation physics, other than SN feedback, are the same as in Shen et al. (2014). The simulated luminous galaxies have blue colors, low star formation efficiencies and metallicities, and high cold gas content, reproducing the observed scaling relations of dwarfs in the Local Volume. Bursty star formation histories and superbubble-driven outflows lead to the formation of kpc-size DM cores when stellar masses reaches $M_{*} > 10^6$ $M_{\odot}$, similar to previous findings. However, the superbubble model appears more effective in destroying DM cusps than the previously adopted "blastwave" model, reflecting a higher coupling efficiency of SN energy with the ISM. On larger scale, superbubble-driven outflows have a more moderate impact: galaxies have higher gas content, more extended stellar disks, and a smaller metal-enriched region in the CGM. The two halos with $M_{vir} \sim 10^9$ $M_{\odot}$, which formed ultra-faint dwarf galaxies in Shen et al. (2014), remain dark due to the different impact of metal-enriched galactic winds from two nearby luminous galaxies. The column density distributions of H I, Si II, C IV and O VI are in agreement with recent observations of CGM around isolated dwarfs. While H I is ubiquitous with a covering fraction of unity within the CGM, Si II and C IV are less extended. O VI is more extended, but its mass is only 11% of the total CGM oxygen budget, as the diffuse CGM is highly ionised by the UVB. Superbubble feedback produces C IV and O VI an order of magnitude higher column densities than those with blastwave feedback. The CGM and DM cores are most sensitive probes of feedback mechanisms.<br />Comment: 16 pages, 15 figures
- Subjects :
- Physics
530 Physics
Star formation
Astrophysics::High Energy Astrophysical Phenomena
Dark matter
FOS: Physical sciences
Astronomy and Astrophysics
Superbubble
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics - Astrophysics of Galaxies
Galaxy
Supernova
1912 Space and Planetary Science
Space and Planetary Science
10231 Institute for Computational Science
Astrophysics of Galaxies (astro-ph.GA)
Galaxy formation and evolution
3103 Astronomy and Astrophysics
Astrophysics::Solar and Stellar Astrophysics
Halo
Astrophysics::Galaxy Astrophysics
Dwarf galaxy
Subjects
Details
- ISSN :
- 00046361
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....1cc5b9879036974f0b97b1d9cc75910d
- Full Text :
- https://doi.org/10.48550/arxiv.2009.06646