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A Cosmological Fire...
A Cosmological Fireball with 16% Gamma-Ray Radiative Efficiency
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- Li, Liang (författare)
- ICRANet, Piazza Repubbl 10, I-65122 Pescara, Italy.;INAF Osservatorio Astron Abruzzo, Via M Maggini Snc, I-64100 Teramo, Italy.;Sapienza Univ Roma, Dept Fis, Piazzale Aldo Moro 5, I-00185 Rome, Italy.;Sapienza Univ Roma, ICRA, Piazzale Aldo Moro 5, I-00185 Rome, Italy.
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- Wang, Yu (författare)
- ICRANet, Piazza Repubbl 10, I-65122 Pescara, Italy.;INAF Osservatorio Astron Abruzzo, Via M Maggini Snc, I-64100 Teramo, Italy.;Sapienza Univ Roma, Dept Fis, Piazzale Aldo Moro 5, I-00185 Rome, Italy.;Sapienza Univ Roma, ICRA, Piazzale Aldo Moro 5, I-00185 Rome, Italy.
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- Ryde, Felix, 1970- (författare)
- KTH,Partikel- och astropartikelfysik,Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden.
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- Pe'er, Asaf (författare)
- Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel.
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- Zhang, Bing (författare)
- Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA.
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- Guiriec, Sylvain (författare)
- George Washington Univ, Dept Phys, 725 21st St NW, Washington, DC 20052 USA.;NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
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- Castro-Tirado, Alberto J. (författare)
- CSIC, Inst Astrofis Andalucia IAA, POB 03004, E-18008 Granada, AL, Spain.;Univ Malaga, Escuela Ingn, Dept Ingn Sistemas & Automat, Malaga, Spain.
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- Kann, D. Alexander (författare)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.;CSIC, Inst Astrofis Andalucia IAA, POB 03004, E-18008 Granada, AL, Spain.
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- Axelsson, Magnus (författare)
- Stockholms universitet,Institutionen för astronomi,Stockholm Univ, Dept Astron, SE-10691 Stockholm, Sweden.
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- Page, Kim (författare)
- Univ Leicester, Sch Phys & Astron, Univ Rd, Leicester LE1 7RH, England.
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Veres, Péter (författare)
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Bhat, P. N. (författare)
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ICRANet, Piazza Repubbl 10, I-65122 Pescara, Italy;INAF Osservatorio Astron Abruzzo, Via M Maggini Snc, I-64100 Teramo, Italy.;Sapienza Univ Roma, Dept Fis, Piazzale Aldo Moro 5, I-00185 Rome, Italy.;Sapienza Univ Roma, ICRA, Piazzale Aldo Moro 5, I-00185 Rome, Italy. Partikel- och astropartikelfysik (creator_code:org_t)
- 2023-02-23
- 2023
- Engelska.
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Ingår i: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8205 .- 2041-8213. ; 944:2
- Relaterad länk:
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https://doi.org/10.3...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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 bright photosphere emission component. A definitive diagnosis of GRB radiation components and the measurement of GRB radiative efficiency require prompt emission and afterglow data, with high resolution and wide band coverage in time and energy. Here, we present a comprehensive temporal and spectral analysis of the TeV-emitting bright GRB 190114C. Its fluence is one of the highest for all the GRBs that have been detected so far, which allows us to perform a high-resolution study of the prompt emission spectral properties and their temporal evolutions, down to a timescale of about 0.1 s. We observe that each of the initial pulses has a thermal component contributing ∼20% of the total energy and that the corresponding temperature and inferred Lorentz factor of the photosphere evolve following broken power-law shapes. From the observation of the nonthermal spectra and the light curve, the onset of the afterglow corresponding to the deceleration of the fireball is considered to start at ∼6 s. By incorporating the thermal and nonthermal observations, as well as the photosphere and synchrotron radiative mechanisms, we can directly derive the fireball energy budget with little dependence on hypothetical parameters, measuring a ∼16% radiative efficiency for this GRB. With the fireball energy budget derived, the afterglow microphysics parameters can also be constrained directly from the data.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Gamma-ray bursts
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Li, Liang
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Wang, Yu
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Ryde, Felix, 197 ...
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Pe'er, Asaf
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Zhang, Bing
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Guiriec, Sylvain
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visa fler...
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Castro-Tirado, A ...
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Kann, D. Alexand ...
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Axelsson, Magnus
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Page, Kim
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Veres, Péter
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Bhat, P. N.
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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Astrophysical Jo ...
- Av lärosätet
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Stockholms universitet
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Kungliga Tekniska Högskolan