Zobrazeno 1 - 10
of 164
pro vyhledávání: '"Asaf Pe'er"'
Autor:
Asaf Pe’er, Bing Zhang
Publikováno v:
The Astrophysical Journal Letters, Vol 973, Iss 2, p L51 (2024)
The brightest-of-all-time GRB 221009A shows evidence for a narrow evolving MeV emission line. Here, we show that this line is due to pair annihilation in the prompt emission region and that its temporal evolution is naturally explained as a high-lati
Externí odkaz:
https://doaj.org/article/36c45e77979d43c886ef0185c8a37532
Publikováno v:
Nature Communications, Vol 13, Iss 1, Pp 1-10 (2022)
The origin of the plateau observed in the early X-ray light curves of gamma ray bursts (GRBs) is debated. Here, the authors show that the observed plateau can be explained within the classical GRB model by considering expanding shell with initial Lor
Externí odkaz:
https://doaj.org/article/0f43199e2e014530b7b1890fa0bd30a9
Autor:
Mukesh Kumar Vyas, Asaf Pe’er
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 1, p 40 (2024)
The jet cores in active galactic nuclei (AGNs) are resolved and found to harbor an edge-brightened structure where the jet base appears extended at the sides compared to its propagation axis. This peculiar phenomenon invites various explanations. We
Externí odkaz:
https://doaj.org/article/bd4770c2ab9646c8a715337be8737ac2
Autor:
Antoine Bret, Asaf Pe’er
Publikováno v:
The Astrophysical Journal, Vol 968, Iss 2, p 100 (2024)
Despite being studied for many years, the structure of collisionless shocks is still not fully determined. Such shocks are known to be accelerators of cosmic rays (CRs), which, in turn, modify the shock structure. The shock width λ is known to be co
Externí odkaz:
https://doaj.org/article/4e43ecfaf192468d80f6303afbb91370
Autor:
Mukesh K. Vyas, Asaf Pe’er
Publikováno v:
The Astrophysical Journal Letters, Vol 943, Iss 1, p L3 (2023)
A high energy power law is a common feature in the spectra of many astrophysical objects. We show that the photons in an unmagnetized relativistic plasma composed of electrons and protons with a variable Lorentz factor (or a velocity shear) go throug
Externí odkaz:
https://doaj.org/article/80d8f3b9b02b4bbea391771d78195359
Autor:
Liang Li, Yu Wang, Felix Ryde, Asaf Pe’er, Bing Zhang, Sylvain Guiriec, Alberto J. Castro-Tirado, D. Alexander Kann, Magnus Axelsson, Kim Page, Péter Veres, P. N. Bhat
Publikováno v:
The Astrophysical Journal Letters, Vol 944, Iss 2, p L57 (2023)
Gamma-ray bursts (GRBs) are the most powerful explosions in the universe. How efficiently the jet converts its energy to radiation is a long-standing problem, which is poorly constrained. The standard model invokes a relativistic fireball with a brig
Externí odkaz:
https://doaj.org/article/cee9d1be1d6f4a1caf2b7d8a1703d767
Publikováno v:
The Astrophysical Journal, Vol 956, Iss 1, p 12 (2023)
Observations of long-duration gamma-ray bursts (GRBs) with TeV emission during their afterglow have been on the rise. Recently, GRB 221009A, the most energetic GRB ever observed, was detected by the Large High Altitude Air Shower Observatory experime
Externí odkaz:
https://doaj.org/article/8b51b42a63694ef69307f43a53790606
Publikováno v:
The Astrophysical Journal, Vol 955, Iss 1, p 70 (2023)
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 acc
Externí odkaz:
https://doaj.org/article/c3c514f0fdfb463fa6efceab8bd3b6b9
Publikováno v:
Galaxies, Vol 10, Iss 2, p 38 (2022)
The recent multi-messenger and multi-wavelength observations of gamma-ray bursts (GRBs) have encouraged renewed interest in these energetic events. In spite of the substantial amount of data accumulated during the past few decades, the nature of the
Externí odkaz:
https://doaj.org/article/7b325c2129094432bad9bad2621f894e
Autor:
Asaf Pe’er
Publikováno v:
Galaxies, Vol 7, Iss 1, p 33 (2019)
Being the most extreme explosions in the universe, gamma-ray bursts (GRBs) provide a unique laboratory to study various plasma physics phenomena. The complex light curve and broad-band, non-thermal spectra indicate a very complicated system on the on
Externí odkaz:
https://doaj.org/article/b55964f8655744c085deadd072301878