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Drivers of disc tilting I: Correlations and possible drivers for Milky Way analogues
- Publication Year :
- 2019
-
Abstract
- The direction of the spin vectors of disk galaxies change over time. We present the tilting rate of a sample of galaxies in the NIHAO suite of cosmological hydrodynamical simulations. Galaxies in our sample have been selected to be isolated and to have well determined spins. We compare the tilting rates to the predicted observing limit of Gaia, finding that our entire sample lies above the limit, in agreement with previous work. To test the role of dark matter and of gas we compare the weighted Pearson's correlation coefficients between the tilting rates and various properties. We find no correlation between the dark halo's tilting rate, shape, or misalignment with respect to the disc, and the tilting rate of the stellar disc. Therefore, we argue that, in the presence of gas, the dark halo plays a negligible role in the tilting of the stellar disc. On the other hand, we find a strong correlation between the tilting rate of the stellar disc and the misalignment of the cold gas warp. Adding the stellar mass fraction improves the correlation, while none of the dark matter's properties together with the cold gas misalignment improves the correlation to any significant extent. This implies that the gas cooling onto the disc is the principal driver of disc tilting.<br />12 pages, 13 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society Main Journal
- Subjects :
- Physics
Spins
Stellar mass
010308 nuclear & particles physics
Milky Way
Dark matter
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
F500
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
Astrophysics - Astrophysics of Galaxies
Galaxy
Dark matter halo
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
0103 physical sciences
Galaxy formation and evolution
Astrophysics::Earth and Planetary Astrophysics
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
Spin-½
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....209227b694e9e1e9030e3dfac40d4be4