Evolving beyond z=0: insights about the future of stars and the intergalactic medium

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Abstract

We present results from seven cosmological simulations that have been extended beyond the present era as far as redshift z ≈ −0.99 or t≈96.0Gyr⁠, using the Enzo simulation code. We adopt the calibrated star formation and feedback prescriptions from our previous work on reproducing the Milky Way with Enzo, with modifications to the simulation code, chemistry, and cooling library. We then consider the future behaviour of the halo mass function (HMF), the equation of state (EOS) of the IGM, and the cosmic star formation history (SFH). Consistent with previous work, we find a freeze out in the HMF at z ≈ −0.6 or t≈28.1Gyr⁠. The evolution of the EOS of the IGM presents an interesting case study of the cosmological coincidence problem, where there is a sharp decline in the IGM temperature immediately after z = 0. For the SFH, the simulations produce a peak and a subsequent decline into the future. However, we do find a turnaround in the SFH after z ≈ −0.98 or t≈82.4Gyr in some simulations, which we attribute to limitations of the criteria used for star formation. By integrating the SFH in time up to z ≈ −0.92 or t≈55.1Gyr⁠, the simulation with the best spatial resolution predicts an asymptotic total stellar mass that is very close to that obtained from extrapolating the fit of the observed SFR. Lastly, we investigate the future evolution of the partition of baryons within a Milky Way-sized galaxy, using both a zoom and a box simulation. Despite vastly different resolutions, these simulations predict individual haloes containing an equal fraction of baryons in stars and gas at the time of freeze out.
Original languageEnglish
Pages (from-to)5432-5450
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume507
Issue number4
Early online date2 Sep 2021
DOIs
Publication statusPublished - 1 Nov 2021

Keywords

  • galaxies: evolution
  • galaxies: formation
  • galaxies: haloes
  • cosmology: theory

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