%0 Generic %1 lovell2017ethos %A Lovell, Mark R. %A Zavala, Jesús %A Vogelsberger, Mark %A Shen, Xuejian %A Cyr-Racine, Francis-Yan %A Pfrommer, Christoph %A Sigurdson, Kris %A Boylan-Kolchin, Michael %A Pillepich, Annalisa %D 2017 %K cold dark matter reionization simulations warm %T ETHOS -- an effective theory of structure formation: Predictions for the high-redshift Universe -- abundance of galaxies and reionization %U http://arxiv.org/abs/1711.10497 %X We contrast predictions for the high-redshift galaxy population and reionization history between Cold Dark Matter (CDM) and an alternative DM model based on the recently developed ETHOS framework (Effective Theory of Structure Formation; Cyr-Racine et al. 2016, Vogelsberger et al. 2016). We focus on an ETHOS model that alleviates the small-scale CDM challenges within the Local Group, and perform the currently highest resolution hydrodynamical volume $\sim$ (36 Mpc)$^3$ simulations within ETHOS and CDM combined with the IllustrisTNG galaxy formation model (gas cell mass $\sim10^5M_ødot$, gas softening $\sim$ 180 pc) to quantify the abundance of galaxies at high redshift and their impact on reionisation. While current observations of high-redshift luminosity functions cannot differentiate between ETHOS and CDM, deep JWST surveys of strongly-lensed, inherently faint galaxies could potentially detect or constrain a primordial cutoff in the power spectrum. We find that ETHOS galaxies have higher ultraviolet (UV) luminosities than their CDM counterparts and a faster build up of the fainter end of the UV luminosity function; a distinct behaviour offering a promising avenue to identify a primordial power spectrum cutoff. This effect, however, makes the optical depth to reionisation less sensitive to this cutoff, such that the ETHOS model differs from the CDM $\tau$ value by only 10% and is consistent with Planck limits, as long as the effective escape fraction is in the 0.1 -- 0.5 range. We conclude that high redshift observations in the JWST era have the potential to probe non-CDM models that offer attractive solutions to the Local Group CDM problems.

@misc{lovell2017ethos, abstract = {We contrast predictions for the high-redshift galaxy population and reionization history between Cold Dark Matter (CDM) and an alternative DM model based on the recently developed ETHOS framework (Effective Theory of Structure Formation; Cyr-Racine et al. 2016, Vogelsberger et al. 2016). We focus on an ETHOS model that alleviates the small-scale CDM challenges within the Local Group, and perform the currently highest resolution hydrodynamical volume $\sim$ (36 Mpc)$^3$ simulations within ETHOS and CDM combined with the IllustrisTNG galaxy formation model (gas cell mass $\sim10^5M_{\odot}$, gas softening $\sim$ 180 pc) to quantify the abundance of galaxies at high redshift and their impact on reionisation. While current observations of high-redshift luminosity functions cannot differentiate between ETHOS and CDM, deep JWST surveys of strongly-lensed, inherently faint galaxies could potentially detect or constrain a primordial cutoff in the power spectrum. We find that ETHOS galaxies have higher ultraviolet (UV) luminosities than their CDM counterparts and a faster build up of the fainter end of the UV luminosity function; a distinct behaviour offering a promising avenue to identify a primordial power spectrum cutoff. This effect, however, makes the optical depth to reionisation less sensitive to this cutoff, such that the ETHOS model differs from the CDM $\tau$ value by only 10% and is consistent with Planck limits, as long as the effective escape fraction is in the 0.1 -- 0.5 range. We conclude that high redshift observations in the JWST era have the potential to probe non-CDM models that offer attractive solutions to the Local Group CDM problems.}, added-at = {2017-11-30T14:52:14.000+0100}, author = {Lovell, Mark R. and Zavala, Jesús and Vogelsberger, Mark and Shen, Xuejian and Cyr-Racine, Francis-Yan and Pfrommer, Christoph and Sigurdson, Kris and Boylan-Kolchin, Michael and Pillepich, Annalisa}, biburl = {https://www.bibsonomy.org/bibtex/2a52c783463c550e718e13ac244cff23e/miki}, description = {[1711.10497] ETHOS -- an effective theory of structure formation: Predictions for the high-redshift Universe -- abundance of galaxies and reionization}, interhash = {35e1635a928e74dfecc6cd7eb607dece}, intrahash = {a52c783463c550e718e13ac244cff23e}, keywords = {cold dark matter reionization simulations warm}, note = {cite arxiv:1711.10497Comment: 15 pages, 8 figures, to be submitted to MNRAS. Please contact lovell@hi.is with any comments}, timestamp = {2017-11-30T14:52:14.000+0100}, title = {ETHOS -- an effective theory of structure formation: Predictions for the high-redshift Universe -- abundance of galaxies and reionization}, url = {http://arxiv.org/abs/1711.10497}, year = 2017 }