The stellar mass–halo mass relation of isolated field dwarfs: a critical test of ΛCDM at the edge of galaxy formation
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Read, Justin, Iorio, G, Agertz, Oscar and Fraternali, F (2017) The stellar mass–halo mass relation of isolated field dwarfs: a critical test of ΛCDM at the edge of galaxy formation Monthly Notices of the Royal Astronomical Society, 467 (2). pp. 2019-2038.
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Abstract
We fit the rotation curves of isolated dwarf galaxies to directly measure the stellar mass-halo mass relation (M∗ − M200) over the mass range 5 × 105 <∼ M∗/M <∼ 108 . By accounting for cusp-core transformations due to stellar feedback, we find a monotonic relation with little scatter. Such monotonicity implies that abundance matching should yield a similar M∗ − M200 if the cosmological model is correct. Using the ‘field galaxy’ stellar mass function from the Sloan Digital Sky Survey (SDSS) and the halo mass function from the Λ Cold Dark Matter Bolshoi simulation, we find remarkable agreement between the two. This holds down to M200 ∼ 5 × 109 M , and to M200 ∼ 5 × 108 M if we assume a power law extrapolation of the SDSS stellar mass function below M∗ ∼ 107 M . However, if instead of SDSS we use the stellar mass function of nearby galaxy groups, then the agreement is poor. This occurs because the group stellar mass function is shallower than that of the field below M∗ ∼ 109 M , recovering the familiar ‘missing satellites’ and ‘too big to fail’ problems. Our result demonstrates that both problems are confined to group environments and must, therefore, owe to ‘galaxy formation physics’ rather than exotic cosmology. Finally, we repeat our analysis for a Λ Warm Dark Matter cosmology, finding that it fails at 68% confidence for a thermal relic mass of mWDM < 1.25 keV, and mWDM < 2 keV if we use the power law extrapolation of SDSS. We conclude by making a number of predictions for future surveys based on these results.
| Item Type: | Article | |||||||||||||||
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| Subjects : | Physics | |||||||||||||||
| Divisions : | Faculty of Engineering and Physical Sciences > Physics | |||||||||||||||
| Authors : |
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| Date : | 25 January 2017 | |||||||||||||||
| DOI : | 10.1093/mnras/stx147 | |||||||||||||||
| Copyright Disclaimer : | 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society, following peer review. The version of record J. I. Read, G. Iorio, O. Agertz, F. Fraternali; The stellar mass–halo mass relation of isolated field dwarfs: a critical test of ΛCDM at the edge of galaxy formation. Mon Not R Astron Soc 2017; 467 (2): 2019-2038. doi: 10.1093/mnras/stx147 is available online at:https://doi.org/10.1093/mnras/stx147 | |||||||||||||||
| Uncontrolled Keywords : | (cosmology:) dark matter, (cosmology:) cosmological parameters, (galaxies:) Local Group, galaxies: dwarf, galaxies: irregular, galaxies: kinematics | |||||||||||||||
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| Depositing User : | Symplectic Elements | |||||||||||||||
| Date Deposited : | 16 Mar 2017 09:14 | |||||||||||||||
| Last Modified : | 16 Jan 2019 17:13 | |||||||||||||||
| URI: | http://epubs.surrey.ac.uk/id/eprint/813791 |
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