Spectra of Poynting-flux powered GRB outflows
We investigate the production of the gamma-ray spectrum of a Poynting-flux dominated GRB outflow. The very high magnetic field strengths (super-equipartition) in such a flow lead to very efficient synchrotron emission. In contrast with internal shocks, dissipation of magnetic energy by reconnection...
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| Published in | Astronomy and astrophysics (Berlin) Vol. 430; no. 1; pp. 1 - 7 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
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Les Ulis
EDP Sciences
01.01.2005
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| Abstract | We investigate the production of the gamma-ray spectrum of a Poynting-flux dominated GRB outflow. The very high magnetic field strengths (super-equipartition) in such a flow lead to very efficient synchrotron emission. In contrast with internal shocks, dissipation of magnetic energy by reconnection is gradual and does not produce the spectrum of cooling electrons associated with shock acceleration. We show that a spectrum with a break in the BATSE energy range is produced, instead, if the magnetic dissipation heats a small (~10-4) population of electrons. |
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| AbstractList | We investigate the production of the gamma-ray spectrum of a Poynting-flux dominated GRB outflow. The very high magnetic field strengths (super-equipartition) in such a flow lead to very efficient synchrotron emission. In contrast with internal shocks, dissipation of magnetic energy by reconnection is gradual and does not produce the spectrum of cooling electrons associated with shock acceleration. We show that a spectrum with a break in the BATSE energy range is produced, instead, if the magnetic dissipation heats a small (610-4) population of electrons. We investigate the production of the gamma-ray spectrum of a Poynting-flux dominated GRB outflow. The very high magnetic field strengths (super-equipartition) in such a flow lead to very efficient synchrotron emission. In contrast with internal shocks, dissipation of magnetic energy by reconnection is gradual and does not produce the spectrum of cooling electrons associated with shock acceleration. We show that a spectrum with a break in the BATSE energy range is produced, instead, if the magnetic dissipation heats a small ( similar to 10 super(-4)) population of electrons. We investigate the production of the gamma-ray spectrum of a Poynting-flux dominated GRB outflow. The very high magnetic field strengths (super-equipartition) in such a flow lead to very efficient synchrotron emission. In contrast with internal shocks, dissipation of magnetic energy by reconnection is gradual and does not produce the spectrum of cooling electrons associated with shock acceleration. We show that a spectrum with a break in the BATSE energy range is produced, instead, if the magnetic dissipation heats a small (~10-4) population of electrons. |
| Author | Spruit, H. C. Giannios, D. |
| Author_xml | – sequence: 1 givenname: D. surname: Giannios fullname: Giannios, D. organization: Max Planck Institute for Astrophysics, Box 1317, 85741 Garching, Germany e-mail: giannios@mpa-garching.mpg.de – sequence: 2 givenname: H. C. surname: Spruit fullname: Spruit, H. C. organization: Max Planck Institute for Astrophysics, Box 1317, 85741 Garching, Germany e-mail: giannios@mpa-garching.mpg.de |
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| Keywords | radiation mechanisms: non-thermal Magnetic reconnection Magnetohydrodynamics Poynting flux Gamma spectra Gamma ray burst Nonthermal radiation Heat dissipation Gamma radiation Energy dissipation High field Magnetic fields magnetohydrodynamics (MHD) Synchrotron radiation gamma rays: bursts Magnetic energy |
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| References | Coroniti (R7) 1990; 349 Frail (R10) 2001; 562 Abramowicz (R1) 1991; 369 Spruit (R16) 2001; 369 Ghisellini (R11) 1991; 251 Barraud (R4) 2003; 400 Blackman (R6) 1994; 73 Blackman (R5) 1994; 71 Lyutikov (R12) 2003; 597 R13 Drenkhahn (R9) 2002; 391 R15 Lyutikov (R14) 2003; 589 R17 Amati (R2) 2002; 390 Band (R3) 1993; 413 Thompson (R18) 1994; 270 Drenkhahn (R8) 2002; 387 |
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| Snippet | We investigate the production of the gamma-ray spectrum of a Poynting-flux dominated GRB outflow. The very high magnetic field strengths (super-equipartition)... We investigate the production of the gamma-ray spectrum of a Poynting-flux dominated GRB outflow. The very high magnetic field strengths (super-equipartition)... |
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| SubjectTerms | gamma rays: bursts magnetohydrodynamics (MHD) radiation mechanisms: non-thermal |
| Title | Spectra of Poynting-flux powered GRB outflows |
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