Proton Synchrotron Origin of the Very-high-energy Emission of GRB 190114C
We consider here a proton-synchrotron model to explain the MAGIC observation of GRB 190114C afterglow in the energy band of 0.2–1 TeV, while the X-ray spectra are explained by electron-synchrotron emission. Given the uncertainty of the particle acceleration process, we consider several variations of...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2023-01-01
|
| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/acec73 |
| _version_ | 1797681472314802176 |
|---|---|
| author | Hebzibha Isravel Asaf Pe’er Damien Bégué |
| author_facet | Hebzibha Isravel Asaf Pe’er Damien Bégué |
| author_sort | Hebzibha Isravel |
| collection | DOAJ |
| description | We consider here a proton-synchrotron model to explain the MAGIC observation of GRB 190114C afterglow in the energy band of 0.2–1 TeV, while the X-ray spectra are explained by electron-synchrotron emission. Given the uncertainty of the particle acceleration process, we consider several variations of the model, and show that they all match the data very well. We find that the values of the uncertain model parameters are reasonable: isotropic explosion energy ∼10 ^54.5 erg, ambient density ∼10–100 cm ^−3 , and the fraction of electrons/protons accelerated to a high-energy power law is of a few percent. All these values are directly derived from the observed teraelectronvolt and X-ray fluxes. The model also requires that protons be accelerated to observed energies as high as a few 10 ^20 eV. Further, assuming that the jet break takes place after 10 ^6 s gives the beaming-corrected energy of the burst to be ≈10 ^53 erg, which is one to two orders of magnitude higher than usually inferred, because of the small fraction of electrons accelerated. Our modeling is consistent with both late time data at all bands, from optical to X-rays, and with numerical models of particle acceleration. Our results thus demonstrate the relevance of proton-synchrotron emission to the high-energy observations of gamma-ray bursts during their afterglow phase. |
| first_indexed | 2024-03-11T23:45:23Z |
| format | Article |
| id | doaj.art-c3c514f0fdfb463fa6efceab8bd3b6b9 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-11T23:45:23Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-c3c514f0fdfb463fa6efceab8bd3b6b92023-09-19T12:19:14ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0195517010.3847/1538-4357/acec73Proton Synchrotron Origin of the Very-high-energy Emission of GRB 190114CHebzibha Isravel0https://orcid.org/0000-0002-8422-6351Asaf Pe’er1https://orcid.org/0000-0001-8667-0889Damien Bégué2https://orcid.org/0000-0003-4477-1846Ben-Gurion University of the Negev , Beer-Sheva 8410501, IsraelBar-Ilan University , Ramat-Gan 5290002, IsraelBar-Ilan University , Ramat-Gan 5290002, IsraelWe consider here a proton-synchrotron model to explain the MAGIC observation of GRB 190114C afterglow in the energy band of 0.2–1 TeV, while the X-ray spectra are explained by electron-synchrotron emission. Given the uncertainty of the particle acceleration process, we consider several variations of the model, and show that they all match the data very well. We find that the values of the uncertain model parameters are reasonable: isotropic explosion energy ∼10 ^54.5 erg, ambient density ∼10–100 cm ^−3 , and the fraction of electrons/protons accelerated to a high-energy power law is of a few percent. All these values are directly derived from the observed teraelectronvolt and X-ray fluxes. The model also requires that protons be accelerated to observed energies as high as a few 10 ^20 eV. Further, assuming that the jet break takes place after 10 ^6 s gives the beaming-corrected energy of the burst to be ≈10 ^53 erg, which is one to two orders of magnitude higher than usually inferred, because of the small fraction of electrons accelerated. Our modeling is consistent with both late time data at all bands, from optical to X-rays, and with numerical models of particle acceleration. Our results thus demonstrate the relevance of proton-synchrotron emission to the high-energy observations of gamma-ray bursts during their afterglow phase.https://doi.org/10.3847/1538-4357/acec73Gamma-ray burstsInterstellar synchrotron emission |
| spellingShingle | Hebzibha Isravel Asaf Pe’er Damien Bégué Proton Synchrotron Origin of the Very-high-energy Emission of GRB 190114C The Astrophysical Journal Gamma-ray bursts Interstellar synchrotron emission |
| title | Proton Synchrotron Origin of the Very-high-energy Emission of GRB 190114C |
| title_full | Proton Synchrotron Origin of the Very-high-energy Emission of GRB 190114C |
| title_fullStr | Proton Synchrotron Origin of the Very-high-energy Emission of GRB 190114C |
| title_full_unstemmed | Proton Synchrotron Origin of the Very-high-energy Emission of GRB 190114C |
| title_short | Proton Synchrotron Origin of the Very-high-energy Emission of GRB 190114C |
| title_sort | proton synchrotron origin of the very high energy emission of grb 190114c |
| topic | Gamma-ray bursts Interstellar synchrotron emission |
| url | https://doi.org/10.3847/1538-4357/acec73 |
| work_keys_str_mv | AT hebzibhaisravel protonsynchrotronoriginoftheveryhighenergyemissionofgrb190114c AT asafpeer protonsynchrotronoriginoftheveryhighenergyemissionofgrb190114c AT damienbegue protonsynchrotronoriginoftheveryhighenergyemissionofgrb190114c |