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Sökning: onr:"swepub:oai:research.chalmers.se:92d31820-5d35-45bf-ad21-7a9dfff58177" > Multiwavelength Vie...

Multiwavelength View of the Close-by GRB 190829A Sheds Light on Gamma-Ray Burst Physics

Salafia, Om Sharan (författare)
Istituto nazionale di astrofisica (INAF),Istituto Nazionale di Fisica Nucleare,National Institute for Nuclear Physics,Universita' degli Studi di Milano-Bicocca,University of Milano-Bicocca
Ravasio, Maria Edvige (författare)
Istituto nazionale di astrofisica (INAF),Universita' degli Studi di Milano-Bicocca,University of Milano-Bicocca
Yang, Jun, 1979 (författare)
Chalmers tekniska högskola,Chalmers University of Technology
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An, Tao (författare)
Guilin University of Electronic Technology,Chinese Academy of Sciences
Orienti, Monica (författare)
Istituto nazionale di astrofisica (INAF)
Ghirlanda, Giancarlo (författare)
Istituto Nazionale di Fisica Nucleare,National Institute for Nuclear Physics,Istituto nazionale di astrofisica (INAF)
Nava, Lara (författare)
Istituto Nazionale di Fisica Nucleare,National Institute for Nuclear Physics,Istituto nazionale di astrofisica (INAF)
Giroletti, M. (författare)
Istituto nazionale di astrofisica (INAF)
Mohan, Prashanth (författare)
Guilin University of Electronic Technology
Spinelli, Riccardo (författare)
Universita degli Studi dell'Insubria,University of Insubria,Istituto nazionale di astrofisica (INAF)
Zhang, Yingkang (författare)
Chinese Academy of Sciences
Marcote, Benito (författare)
Joint Institute for VLBI in Europe (JIVE)
Cimo, Giuseppe (författare)
Joint Institute for VLBI in Europe (JIVE)
Wu, Xuefeng (författare)
Chinese Academy of Sciences
Li, Zhixuan (författare)
Chinese Academy of Sciences
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 (creator_code:org_t)
2022-05-27
2022
Engelska.
Ingår i: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8213 .- 2041-8205. ; 931:2
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • We monitored the position of the close-by (about 370 Mpc) gamma-ray burst GRB 190829A, which originated from a massive star collapse, through very long baseline interferometry (VLBI) observations with the European VLBI Network and the Very Long Baseline Array, carrying out a total of nine observations between 9 and 117 days after the gamma-ray burst at 5 and 15 GHz, with a typical resolution of a few milliarcseconds. From a state-of-the art analysis of these data, we obtained valuable limits on the source size and expansion rate. The limits are in agreement with the size evolution entailed by a detailed modeling of the multiwavelength light curves with a forward-plus-reverse shock model, which agrees with the observations across almost 18 orders of magnitude in frequency (including the HESS data at TeV photon energies) and more than 4 orders of magnitude in time. Thanks to the multiwavelength, high-cadence coverage of the afterglow, inherent degeneracies in the afterglow model are broken to a large extent, allowing us to capture some unique physical insights; we find a low prompt emission efficiency of less than or similar to 10(-3), a low fraction of relativistic electrons in the forward shock downstream chi ( e ) < 13% (90% credible level), and a rapid decay of the magnetic field in the reverse shock downstream after the shock crossing. While our model assumes an on-axis jet, our VLBI astrometry is not sufficiently tight as to exclude any off-axis viewing angle, but we can exclude the line of sight to have been more than similar to 2 degrees away from the border of the gamma-ray-producing region based on compactness arguments.

Ämnesord

NATURVETENSKAP  -- Fysik -- Acceleratorfysik och instrumentering (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Accelerator Physics and Instrumentation (hsv//eng)
NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)
NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

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