2020
DOI: 10.3847/1538-4357/ab744e
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Gamma-Rays from Kilonovae and the Cosmic Gamma-Ray Background

Abstract: The recent detection of the gravitational wave event GW170817, produced by the coalescence of two neutron stars, and of its optical-infrared counterpart, powered by the radioactive decay of rprocess elements, has opened a new window to gamma-ray astronomy: the direct detection of photons coming from such decays. Here we calculate the contribution of kilonovae to the diffuse gamma-ray background in the MeV range, using recent results on the spectra of the gamma-rays emitted in individual events, and we compare … Show more

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Cited by 8 publications
(4 citation statements)
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“…MeV gamma rays are also produced by nuclear processes in the stellar explosions known as supernovae (both so-called Type Ia 18 and core collapse 19 ), which surely also contribute 15 . Other proposed sources include non-thermal emission from black holes 20 , nuclear gamma rays from the nucleosynthesis of heavy elements in neutron star mergers ("kilonovae") 21 , and dark matter annihilation 22 . Intriguingly, a recent compilation of the most up-to-date theoretical models 23 is not able to reproduce the existing COMPTEL and SMM measurements, with the total predicted flux falling a factor of ~2 below the data points for energies below ~1.5 MeV (Fig.…”
Section: Scientific Motivationmentioning
confidence: 99%
“…MeV gamma rays are also produced by nuclear processes in the stellar explosions known as supernovae (both so-called Type Ia 18 and core collapse 19 ), which surely also contribute 15 . Other proposed sources include non-thermal emission from black holes 20 , nuclear gamma rays from the nucleosynthesis of heavy elements in neutron star mergers ("kilonovae") 21 , and dark matter annihilation 22 . Intriguingly, a recent compilation of the most up-to-date theoretical models 23 is not able to reproduce the existing COMPTEL and SMM measurements, with the total predicted flux falling a factor of ~2 below the data points for energies below ~1.5 MeV (Fig.…”
Section: Scientific Motivationmentioning
confidence: 99%
“…Other sources contributing to the CGB include a diverse set of active galaxies. Seyfert galaxies provide most of the emission from X-ray energies up to 0.3 MeV (Madau et al 1994;Ueda et al 2003;Ruiz-Lapuente & Korobkin 2020) while blazars, starforming galaxies, and radio galaxies seem to be responsible for the emission from 50 MeV to the GeV range (Ajello et al 2015;Di Mauro & Donato 2015;Ruiz-Lapuente & Korobkin 2020). Recent work by Marcotulli et al (2022) shows that there is a considerable contribution from FSRQs in the 0.1-20.0 MeV regime.…”
Section: Introductionmentioning
confidence: 99%
“…MeV gamma rays can provide complementary evidence, should the event occur nearby. Previous studies (Hotokezaka et al 2016;Li 2019;Korobkin et al 2020;Ruiz-Lapuente & Korobkin 2020) considered the MeV photons emitted from the β decay of radioactive r-process species and found such signals can encode key information on composition and event morphology.…”
Section: Introductionmentioning
confidence: 99%