Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Björn Ahlgren"'
Publikováno v:
The Astrophysical Journal, Vol 944, Iss 1, p 73 (2023)
The existence of excess absorption in the X-ray spectra of GRBs is well known, but the primary location of the absorbing material is still uncertain. To gain more knowledge about this, we have performed a time-resolved analysis of the X-ray spectra o
Externí odkaz:
https://doaj.org/article/d32ea1ed73c94810a1868ea5e4b4ce44
Autor:
Felix Ryde, Shabnam Iyyani, Björn Ahlgren, Asaf Pe’er, Vidushi Sharma, Christoffer Lundman, Magnus Axelsson
The physical processes of the gamma-ray emission and particle acceleration during the prompt phase in GRBs are still unsettled. In order to perform an unambiguous physical modelling of observations, a clear identification of the emission mechanism is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::27f71737f0334a468bbafa85f2b65a73
http://arxiv.org/abs/2206.00680
http://arxiv.org/abs/2206.00680
Autor:
Donald C. Warren, Maria Dainotti, Maxim V. Barkov, Björn Ahlgren, Hirotaka Ito, Shigehiro Nagataki
Publikováno v:
The Astrophysical Journal. 924:40
We extend previous work on gamma-ray burst (GRB) afterglows involving hot thermal electrons at the base of a shock-accelerated tail. Using a physically-motivated electron distribution based on first-principles simulations, we compute broadband emissi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1beaa2ce1c840601ce638bfad5a2748f
https://doi.org/10.3847/1538-4357/ac2f43
https://doi.org/10.3847/1538-4357/ac2f43
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 474:2401-2418
The early X-ray afterglows of gamma-ray bursts (GRBs) are usually well described by absorbed power laws. However, in some cases, additional thermal components have been identified. The origin of this emission is debated, with proposed explanations in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dedf2f19c5b266af9b20ad3449315700
https://doi.org/10.1093/mnras/stx2920
https://doi.org/10.1093/mnras/stx2920
Publikováno v:
Monthly Notices of the Royal Astronomical Society
It has been suggested that the prompt emission in gamma-ray bursts (GRBs) could be described by radiation from the photosphere in a hot fireball. Such models must be tested by directly fitting them to data. In this work we use data from the Fermi Gam
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e1c7eb2c107d95c147c90b0c68e2163
http://arxiv.org/abs/1901.06844
http://arxiv.org/abs/1901.06844
Autor:
Björn Ahlgren, Josefin Larsson
Publikováno v:
The Astrophysical Journal. 897:178
Macrolensing of gamma-ray bursts (GRBs) is expected to manifest as a GRB recurring with the same light curve and spectrum as a previous one, but with a different flux and a slightly offset position. Identifying such lensed GRBs may give important inf
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2a0e79cdf881c07d1a2d941f65b62fde
https://doi.org/10.3847/1538-4357/ab9b8a
https://doi.org/10.3847/1538-4357/ab9b8a
Publikováno v:
Monthly Notices of the Royal Astronomical Society: Letters. 454:L31-L35
The origin of the prompt emission in gamma-ray bursts (GRBs) is still an unsolved problem and several different mechanisms have been suggested. Here we fit Fermi GRB data with a photospheric emission model which includes dissipation of the jet kineti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c6d7758699a8b37b0551032b79b9a993
https://doi.org/10.1093/mnrasl/slv114
https://doi.org/10.1093/mnrasl/slv114
Extremely narrow spectrum of GRB110920A: further evidence for localised, subphotospheric dissipation
Autor:
Sinéad McGlynn, Shabnam Iyyani, Christoffer Lundman, J. M. Burgess, Björn Ahlgren, Josefin Larsson, Asaf Pe'er, Felix Ryde, Magnus Axelsson
Much evidence points towards that the photosphere in the relativistic outflow in GRBs plays an important role in shaping the observed MeV spectrum. However, it is unclear whether the spectrum is fully produced by the photosphere or whether a substant
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::68c3e1fc23daaa2f7d6d1d7a94dc70c0
Comment on "Is Dark Matter with Long-Range Interactions a Solution to All Small-Scale Problems of Λ Cold Dark Matter Cosmology?"
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1ab0b21ec3f35ca479f3bb81e59087b3
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-136396
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-136396
Publikováno v:
Astrophysical Journal; 8/1/2019, Vol. 880 Issue 2, p1-1, 1p