The impact of the first galaxies on cosmic dawn and reionization
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
The impact of the first galaxies on cosmic dawn and reionization. / Munoz, Julian B.; Qin, Yuxiang; Mesinger, Andrei; Murray, Steven G.; Greig, Bradley; Mason, Charlotte.
In: Monthly Notices of the Royal Astronomical Society, Vol. 511, No. 3, 22.02.2022, p. 3657-3681.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - The impact of the first galaxies on cosmic dawn and reionization
AU - Munoz, Julian B.
AU - Qin, Yuxiang
AU - Mesinger, Andrei
AU - Murray, Steven G.
AU - Greig, Bradley
AU - Mason, Charlotte
PY - 2022/2/22
Y1 - 2022/2/22
N2 - The formation of the first galaxies during cosmic dawn and reionization (at redshifts z = 5-30), triggered the last major phase transition of our universe, as hydrogen evolved from cold and neutral to hot and ionized. The 21-cm line of neutral hydrogen will soon allow us to map these cosmic milestones and study the galaxies that drove them. To aid in interpreting these observations, we upgrade the publicly available code 21cmFAST. We introduce a new, flexible parametrization of the additive feedback from: an inhomogeneous, H-2-dissociating (Lyman-Werner; LW) background; and dark matter - baryon relative velocities; which recovers results from recent, small-scale hydrodynamical simulations with both effects. We perform a large, 'best-guess' simulation as the 2021 installment of the Evolution of 21-cm Structure (EOS) project. This improves the previous release with a galaxy model that reproduces the observed UV luminosity functions (UVLFs), and by including a population of molecular-cooling galaxies. The resulting 21-cm global signal and power spectrum are significantly weaker, primarily due to a more rapid evolution of the star formation rate density required to match the UVLFs. Nevertheless, we forecast high signal-to-noise detections for both HERA and the SKA. We demonstrate how the stellar-to-halo mass relation of the unseen, first galaxies can be inferred from the 21-cm evolution. Finally, we show that the spatial modulation of X-ray heating due to relative velocities provides a unique acoustic signature that is detectable at z approximate to 10-15 in our fiducial model. Ours are the first public simulations with joint inhomogeneous LW and relative-velocity feedback across the entire cosmic dawn and reionization, and we make them available at this link https://scholar.harvard.edu/julianbmunoz/eos-21.
AB - The formation of the first galaxies during cosmic dawn and reionization (at redshifts z = 5-30), triggered the last major phase transition of our universe, as hydrogen evolved from cold and neutral to hot and ionized. The 21-cm line of neutral hydrogen will soon allow us to map these cosmic milestones and study the galaxies that drove them. To aid in interpreting these observations, we upgrade the publicly available code 21cmFAST. We introduce a new, flexible parametrization of the additive feedback from: an inhomogeneous, H-2-dissociating (Lyman-Werner; LW) background; and dark matter - baryon relative velocities; which recovers results from recent, small-scale hydrodynamical simulations with both effects. We perform a large, 'best-guess' simulation as the 2021 installment of the Evolution of 21-cm Structure (EOS) project. This improves the previous release with a galaxy model that reproduces the observed UV luminosity functions (UVLFs), and by including a population of molecular-cooling galaxies. The resulting 21-cm global signal and power spectrum are significantly weaker, primarily due to a more rapid evolution of the star formation rate density required to match the UVLFs. Nevertheless, we forecast high signal-to-noise detections for both HERA and the SKA. We demonstrate how the stellar-to-halo mass relation of the unseen, first galaxies can be inferred from the 21-cm evolution. Finally, we show that the spatial modulation of X-ray heating due to relative velocities provides a unique acoustic signature that is detectable at z approximate to 10-15 in our fiducial model. Ours are the first public simulations with joint inhomogeneous LW and relative-velocity feedback across the entire cosmic dawn and reionization, and we make them available at this link https://scholar.harvard.edu/julianbmunoz/eos-21.
KW - galaxies: high-redshift
KW - intergalactic medium
KW - cosmology: theory
KW - dark ages
KW - reionization
KW - first stars
KW - diffuse radiation
KW - UV LUMINOSITY FUNCTIONS
KW - 21 CM SIGNAL
KW - III STAR-FORMATION
KW - DARK-MATTER
KW - LIGHT-CONE
KW - STREAMING VELOCITIES
KW - 21-CM FLUCTUATIONS
KW - RADIATIVE FEEDBACK
KW - NEUTRAL HYDROGEN
KW - POWER SPECTRUM
U2 - 10.1093/mnras/stac185
DO - 10.1093/mnras/stac185
M3 - Journal article
VL - 511
SP - 3657
EP - 3681
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 3
ER -
ID: 302554313