Dark satellites and cosmic reionization

Andrea V. Macciò, Ben Moore, Joachim Stadel, Doug Potter

Research output: Contribution to conferencePaper

Abstract

A possible explanation of the present discrepancy between the abundance of galactic subhaloes predicted by N-Body simulations with those observed in the Local Group is presented. We study the impact of an early reionization on the baryonic component of the Universe using SPH simulations on group and galactic scales. We use a simplified model for reionization described as an instantaneous increment of the IGM temperature (with 105 < TIGM < 106 K) at a given redshift (zr = 8). We find that a key role is played by compton cooling (interaction between hot electrons and the CMB photons); at high redshift (zr > 10) this cooling is very efficient and it is able to counteract any heating of the gas within few Myrs (˜ 70). This means that a late reionization is needed (zr < 9) to sufficiently reduce the number of luminous dwarf satellites around our Galaxy. For a reionization redshift zr = 8 and a reionization temperature of TIGM ˜ 105 K we are able to reproduce the observed number of Local Group dwarf galaxies in our simulations.

Original languageEnglish (US)
StatePublished - 2020
Event2006 41st Rencontres de Moriond and 26th Astrophysics Moriond Meeting: From Dark Halos to Light - La Thuile, Italy
Duration: Mar 12 2006Mar 18 2006

Conference

Conference2006 41st Rencontres de Moriond and 26th Astrophysics Moriond Meeting: From Dark Halos to Light
CountryItaly
CityLa Thuile
Period3/12/063/18/06

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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    Macciò, A. V., Moore, B., Stadel, J., & Potter, D. (2020). Dark satellites and cosmic reionization. Paper presented at 2006 41st Rencontres de Moriond and 26th Astrophysics Moriond Meeting: From Dark Halos to Light, La Thuile, Italy.