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  ETHOS - an effective theory of structure formation: predictions for the high-redshift Universe - abundance of galaxies and reionization

Lovell, M. R., Zavala, J., Vogelsberger, M., Shen, X., Cyr-Racine, F.-Y., Pfrommer, C., et al. (2018). ETHOS - an effective theory of structure formation: predictions for the high-redshift Universe - abundance of galaxies and reionization. Monthly Notices of the Royal Astronomical Society, 477, 2886-2899.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CC68-1 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CC69-0
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018MNRAS.477.2886L (Any fulltext)
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 Creators:
Lovell, Mark R.1, Author
Zavala, Jesús1, Author
Vogelsberger, Mark1, Author
Shen, Xuejian1, Author
Cyr-Racine, Francis-Yan1, Author
Pfrommer, Christoph1, Author
Sigurdson, Kris1, Author
Boylan-Kolchin, Michael1, Author
Pillepich, Annalisa1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: high-redshift dark matter Astrophysics - Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology
 Abstract: We contrast predictions for the high-redshift galaxy population and reionization history between cold dark matter (CDM) and an alternative self-interacting dark matter model based on the recently developed ETHOS framework that alleviates the small-scale CDM challenges within the Local Group. We perform the highest resolution hydrodynamical cosmological simulations (a 36 Mpc3 volume with gas cell mass of ̃ 105 M_{☉} and minimum gas softening of ̃180 pc) within ETHOS to date - plus a CDM counterpart - to quantify the abundance of galaxies at high redshift and their impact on reionization. We find that ETHOS predicts galaxies with higher ultraviolet (UV) luminosities than their CDM counterparts and a faster build-up of the faint end of the UV luminosity function. These effects, however, make the optical depth to reionization less sensitive to the power spectrum cut-off: the ETHOS model differs from the CDM τ value by only 10 per cent and is consistent with Planck limits if the effective escape fraction of UV photons is 0.1-0.5. We conclude that current observations of high-redshift luminosity functions cannot differentiate between ETHOS and CDM models, but deep James Webb Space Telescope surveys of strongly lensed, inherently faint galaxies have the potential to test non-CDM models that offer attractive solutions to CDM's Local Group problems.

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 Dates: 2018
 Publication Status: Issued
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 477 Sequence Number: - Start / End Page: 2886 - 2899 Identifier: -