Radio background and IGM heating due to Pop III supernovae explosions

Abstract

We consider the synchrotron emission from high energy electrons accelerated in supernova explosions of massive Population III stars in high redshift minihaloes of mass $10^{5–7}{\mathrm{M}}_{\odot }$. We show the resulting intensity of radio background from this process can be substantial, which could potentially explain the recently reported EDGES result, if not for the associated heating of the IGM by CR protons which are also produced at the same time. The trade-off between the radio background and heating is such that the 21 cm brightness temperature cannot be larger than $|\Delta T_{21}|\sim 0.25$ K. The radio background and heating are both produced by energetic particles, although one by energetic electrons and the other by energetic protons. The two competing processes, production of radio background and heating of IGM by Pop III supernovae, determine the depth of the trough in the 21 cm brightness temperature which can be observed in future experiments and used as a test of this scenario.

6 pages, 2 figures, Accepted for publication in MNRAS

References in corpus (6)

• The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
• Early Cosmological HII/HeIII Regions and Their Impact on Second-Generation Star Formation
• Relic keV sterile neutrinos and reionization
• Cosmic backgrounds due to the formation of the first generation of supermassive black holes
• On the non-thermal electron-to-proton ratio at cosmic acceleration sites
• First supernovae in dwarf protogalaxies

Cited by in corpus (17)

• Signature of Excess Radio Background in the 21-cm Global Signal and Power Spectrum
• The REACH radiometer for detecting the 21-cm hydrogen signal from redshift 7.5 to 28
• Astrophysical Constraints from the SARAS3 non-detection of the Cosmic Dawn Sky-Averaged 21-cm Signal
• Ruling out 3 keV warm dark matter using 21 cm-EDGES data
• The role of soft photon injection and heating in 21 cm cosmology
• A unified framework for 21cm tomography sample generation and parameter inference with Progressively Growing GANs
• Interstellar Extinction and Elemental Abundances
• Can accreting primordial black holes explain the excess radio background?
• Using Artificial Neural Networks to extract the 21-cm Global Signal from the EDGES data
• Constraining exotic dark matter models with the dark ages 21-cm signal
• Bounds on sterile neutrino lifetime and mixing angle with active neutrinos by global 21 cm signal
• Black holes at cosmic dawn in the redshifted 21cm signal of HI
• Narrowing the discovery space of the cosmological 21-cm signal using multi-wavelength constraints
• The Hydrogen Mixing Portal, Its Origins, and Its Cosmological Effects
• Predictions of the 21cm global signal in the JWST and ALMA era
• The magnitude of the dark ages 21-cm signal in the context of existing early and late time constraints on $\Lambda$CDM
• A Comprehensive Bayesian re-analysis of the SARAS2 data from the Epoch of Reionization