New Constraints on IGM Thermal Evolution from the Ly α Forest Power Spectrum

Walther, Michael; Oñorbe, Jose; Hennawi, Joseph F.; Lukić, Zarija

doi:10.3847/1538-4357/aafad1

Title: New Constraints on IGM Thermal Evolution from the Ly α Forest Power Spectrum

Journal Article · Wed Feb 06 00:00:00 EST 2019 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aafad1· OSTI ID:1544084

^[1];

^[2];

^[3]; Lukić, Zarija ^[4]

Univ. of California, Santa Barbara, CA (United States); Max Planck Inst. for Astronomie, Heidelberg (Germany); Heidelberg Univ. (Germany)
Max Planck Inst. for Astronomie, Heidelberg (Germany); Univ. of Edinburgh, Scotland (United Kingdom). The Royal Observatory
Univ. of California, Santa Barbara, CA (United States); Max Planck Inst. for Astronomie, Heidelberg (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

We determine the thermal evolution of the intergalactic medium (IGM) over 3 Gyr of cosmic time 1.8 < z < 5.4 by comparing measurements of the Ly forest power spectrum to a suite of ~70 hydrodynamical simulations. We conduct Bayesian inference of IGM thermal parameters using an end-to-end forward modeling framework whereby mock spectra generated from our simulation grid are used to build a custom emulator that interpolates the power spectrum between thermal grid points. The temperature at mean density T₀ rises steadily from T₀ ~6000 K at z=5.4, peaks at 14,000 K for z ~3.4, and decreases at lower redshift, reaching T₀ ~ 7000 K by z ~ 1.8. This evolution provides conclusive evidence for photoionization heating resulting from the reionization of He II, as well as the subsequent cooling of the IGM due to the expansion of the universe after all reionization events are complete. Our results are broadly consistent with previous measurements of thermal evolution based on a variety of approaches, but the sensitivity of the power spectrum, the combination of high-precision measurements of large-scale modes (k ≲ 0.02 s km^-1) from the Baryon Oscillation Spectroscopic Survey with our recent determination of the small-scale power, our large grid of models, and our careful statistical analysis allow us to break the well-known degeneracy between the temperature at mean density T₀ and the slope of the temperature-density relation that has plagued previous analyses. At the highest redshifts, z ≥ 5, we infer lower temperatures than expected from the standard picture of IGM thermal evolution leaving little room for additional smoothing of the Lyα forest by free streaming of warm dark matter.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21), Scientific Discovery through Advanced Computing (SciDAC) (SC21.1 )

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1544084

Alternate ID(s):: OSTI ID: 1576501

Journal Information:: The Astrophysical Journal (Online), Vol. 872, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 71 works

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