ETHOS – an effective theory of structure formation: predictions for the high-redshift Universe – abundance of galaxies and reionization
Name
1711.10497.pdf
Description
Accepted version
Size
5.9 MB
Format
Unknown
Checksum (MD5)
77f803599ba3d2cf200e56f5c8474a92
Author(s)
Lovell, Mark R
Zavala, Jesús
Vogelsberger, Mark
Vogelsberger, Mark
Shen, Xuejian
Cyr-Racine, Francis-Yan
Pfrommer, Christoph
Sigurdson, Kris
Boylan-Kolchin, Michael
Pillepich, Annalisa
Date Issued
2018
Journal
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP)
Version
Author's final manuscript
Abstract
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. 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 ~105M⊙ 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1093/MNRAS/STY818
