Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 477, Issue 3, Pages 2886-2899Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty818
Keywords
galaxies: high-redshift; dark matter
Categories
Funding
- COFUND/Durham Junior Research Fellowship under EU [609412]
- Icelandic Research Fund [173929-051]
- MIT RSC award
- Alfred P. Sloan Foundation
- NASA ATP grant [NNX17AG29G]
- NSF [AST-1517226]
- NASA [NNX17AG29G, NAS5-26555]
- Space Telescope Science Institute [HST-AR-13888, HST-AR-13896, HST-AR-14282, HST-AR-14554]
- National Aeronautical and Space Administration ATP at Harvard University [NNX16AI12G]
- Extreme Science and Engineering Discovery Environment [TG-AST140080]
- NSF
- Direct For Mathematical & Physical Scien [1517226] Funding Source: National Science Foundation
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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 Mpc(3) volume with gas cell mass of similar to 10(5) M-circle dot and minimum gas softening of similar to 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 tau 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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