Kavli Affiliate: George Efstathiou
| First 5 Authors: , , , ,
| Summary:
In the current era of JWST, we continue to uncover a wealth of information
about the Universe deep into the Epoch of Reionization. In this work, we use a
suite of simulations with 21cmSPACE, to explore the astrophysical properties of
early galaxies and their imprint on high-redshift observables. Our analysis
incorporates a range of multi-wavelength datasets including UV luminosity
functions (UVLFs) from HST and JWST spanning $z=6-14.5$, the 21-cm global
signal and power spectrum limits from SARAS 3 and HERA respectively, as well as
present-day diffuse X-ray and radio backgrounds. We constrain a flexible
halo-mass and redshift dependent model of star-formation efficiency (SFE),
defined as the fraction of gas converted into stars, and find that it is best
described by minimal redshift evolution at $zapprox 6-10$, followed by rapid
evolution at $zapprox10-15$. Using Bayesian inference, we derive functional
posteriors of the SFE, inferring that halos of mass
$M_h=10^10,mathrmM_odot$ have efficiencies of $approx 1 – 2%$ at
$zlesssim10$, $approx8%$ at $z=12$ and $approx21%$ at $z=15$. We also
highlight the synergy between UVLFs and global 21-cm signal from SARAS 3 in
constraining the minimum virial conditions required for star-formation in
halos. In parallel, we find the X-ray and radio efficiencies of early galaxies
to be $f_X = 0.8^+9.7_-0.4$ and $f_r lesssim 16.9$ respectively, improving
upon previous works that exclude UVLF data. Our results underscore the critical
role of UVLFs in constraining early galaxy properties, and their synergy with
21-cm and other multi-wavelength observations.
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