Adiabatic Non-resonant Acceleration in Magnetic Turbulence and Hard Spectra of Gamma-Ray Bursts
We introduce a non-resonant acceleration mechanism arising from the second adiabatic invariant in magnetic turbulence and apply it to study the prompt emission spectra of gamma-ray bursts (GRBs). The mechanism contains both the first- and second-order Fermi acceleration, originating from the interac...
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| Veröffentlicht in: | Astrophysical journal. Letters 2017-09, Vol.846 (2), p.L28 |
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| container_title | Astrophysical journal. Letters |
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| creator | Xu, Siyao Zhang, Bing |
| description | We introduce a non-resonant acceleration mechanism arising from the second adiabatic invariant in magnetic turbulence and apply it to study the prompt emission spectra of gamma-ray bursts (GRBs). The mechanism contains both the first- and second-order Fermi acceleration, originating from the interacting turbulent reconnection and dynamo processes. It leads to a hard electron energy distribution up to a cutoff energy at the balance between the acceleration and synchrotron cooling. The sufficient acceleration rate ensures a rapid hardening of any initial energy distribution to a power-law distribution with the index , which naturally produces a low-energy photon index via the synchrotron radiation. For typical GRB parameters, the synchrotron emission can extend to a characteristic photon energy on the order of ∼100 keV. |
| doi_str_mv | 10.3847/2041-8213/aa88b1 |
| format | Article |
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The mechanism contains both the first- and second-order Fermi acceleration, originating from the interacting turbulent reconnection and dynamo processes. It leads to a hard electron energy distribution up to a cutoff energy at the balance between the acceleration and synchrotron cooling. The sufficient acceleration rate ensures a rapid hardening of any initial energy distribution to a power-law distribution with the index , which naturally produces a low-energy photon index via the synchrotron radiation. 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Letters</title><addtitle>APJL</addtitle><addtitle>Astrophys. J. Lett</addtitle><description>We introduce a non-resonant acceleration mechanism arising from the second adiabatic invariant in magnetic turbulence and apply it to study the prompt emission spectra of gamma-ray bursts (GRBs). The mechanism contains both the first- and second-order Fermi acceleration, originating from the interacting turbulent reconnection and dynamo processes. It leads to a hard electron energy distribution up to a cutoff energy at the balance between the acceleration and synchrotron cooling. The sufficient acceleration rate ensures a rapid hardening of any initial energy distribution to a power-law distribution with the index , which naturally produces a low-energy photon index via the synchrotron radiation. For typical GRB parameters, the synchrotron emission can extend to a characteristic photon energy on the order of ∼100 keV.</description><subject>ACCELERATION</subject><subject>acceleration of particles</subject><subject>Adiabatic flow</subject><subject>Alpha rays</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>COOLING</subject><subject>Cooling rate</subject><subject>COSMIC GAMMA BURSTS</subject><subject>Electron energy distribution</subject><subject>ELECTRONS</subject><subject>Emission analysis</subject><subject>EMISSION SPECTRA</subject><subject>ENERGY SPECTRA</subject><subject>Gamma ray bursts</subject><subject>Gamma ray spectra</subject><subject>Gamma rays</subject><subject>gamma-ray burst: general</subject><subject>Hardening rate</subject><subject>MAGNETIC FIELDS</subject><subject>PHOTONS</subject><subject>Power law</subject><subject>Radiation</subject><subject>SYNCHROTRON RADIATION</subject><subject>TURBULENCE</subject><issn>2041-8205</issn><issn>2041-8213</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNp1kL1PwzAQxS0EEqWwM1piJdQfSWzGUkGLVECCMlsX5wKpWrvYydD_nkRB7cR0p7vfe3p6hFxzdid1qiaCpTzRgssJgNYFPyGjw-n0sLPsnFzEuGZMsJzrETHTsoYCmtrSV--SgNE7cA2dWosbDN3DO1o7-gJfDntq1Yai3aCzSMGVdAGhpB87tE0A6is6h-0WknfY04c2xCZekrMKNhGv_uaYfD49rmaLZPk2f55Nl4lN07RJ0ELFM8WxUMgs5ELrEiupVQFSlMi5zlKpOwQYcguqFDZjQlUVx6ooZCHH5Gbw9bGpTbR1g_bbeue6ZEYIrUSWqiO1C_6nxdiYtW-D64IZIfMsl5yx-45iA2WDjzFgZXah3kLYG85MX7bp2zR9s2You5PcDpLa746e_-K_4X5_xA</recordid><startdate>20170910</startdate><enddate>20170910</enddate><creator>Xu, Siyao</creator><creator>Zhang, Bing</creator><general>The American Astronomical Society</general><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0002-9725-2524</orcidid><orcidid>https://orcid.org/0000-0002-0458-7828</orcidid></search><sort><creationdate>20170910</creationdate><title>Adiabatic Non-resonant Acceleration in Magnetic Turbulence and Hard Spectra of Gamma-Ray Bursts</title><author>Xu, Siyao ; Zhang, Bing</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c444t-ecaf1571eb7e0ca6288def387ba32de1185438f15a0e1ca7d2c5027ff1efbb3b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>ACCELERATION</topic><topic>acceleration of particles</topic><topic>Adiabatic flow</topic><topic>Alpha rays</topic><topic>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</topic><topic>COOLING</topic><topic>Cooling rate</topic><topic>COSMIC GAMMA BURSTS</topic><topic>Electron energy distribution</topic><topic>ELECTRONS</topic><topic>Emission analysis</topic><topic>EMISSION SPECTRA</topic><topic>ENERGY SPECTRA</topic><topic>Gamma ray bursts</topic><topic>Gamma ray spectra</topic><topic>Gamma rays</topic><topic>gamma-ray burst: general</topic><topic>Hardening rate</topic><topic>MAGNETIC FIELDS</topic><topic>PHOTONS</topic><topic>Power law</topic><topic>Radiation</topic><topic>SYNCHROTRON RADIATION</topic><topic>TURBULENCE</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Xu, Siyao</creatorcontrib><creatorcontrib>Zhang, Bing</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>Astrophysical journal. Letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Xu, Siyao</au><au>Zhang, Bing</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Adiabatic Non-resonant Acceleration in Magnetic Turbulence and Hard Spectra of Gamma-Ray Bursts</atitle><jtitle>Astrophysical journal. Letters</jtitle><stitle>APJL</stitle><addtitle>Astrophys. J. Lett</addtitle><date>2017-09-10</date><risdate>2017</risdate><volume>846</volume><issue>2</issue><spage>L28</spage><pages>L28-</pages><issn>2041-8205</issn><eissn>2041-8213</eissn><abstract>We introduce a non-resonant acceleration mechanism arising from the second adiabatic invariant in magnetic turbulence and apply it to study the prompt emission spectra of gamma-ray bursts (GRBs). The mechanism contains both the first- and second-order Fermi acceleration, originating from the interacting turbulent reconnection and dynamo processes. It leads to a hard electron energy distribution up to a cutoff energy at the balance between the acceleration and synchrotron cooling. The sufficient acceleration rate ensures a rapid hardening of any initial energy distribution to a power-law distribution with the index , which naturally produces a low-energy photon index via the synchrotron radiation. For typical GRB parameters, the synchrotron emission can extend to a characteristic photon energy on the order of ∼100 keV.</abstract><cop>Austin</cop><pub>The American Astronomical Society</pub><doi>10.3847/2041-8213/aa88b1</doi><tpages>5</tpages><orcidid>https://orcid.org/0000-0002-9725-2524</orcidid><orcidid>https://orcid.org/0000-0002-0458-7828</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | ACCELERATION acceleration of particles Adiabatic flow Alpha rays ASTROPHYSICS, COSMOLOGY AND ASTRONOMY COOLING Cooling rate COSMIC GAMMA BURSTS Electron energy distribution ELECTRONS Emission analysis EMISSION SPECTRA ENERGY SPECTRA Gamma ray bursts Gamma ray spectra Gamma rays gamma-ray burst: general Hardening rate MAGNETIC FIELDS PHOTONS Power law Radiation SYNCHROTRON RADIATION TURBULENCE |
| title | Adiabatic Non-resonant Acceleration in Magnetic Turbulence and Hard Spectra of Gamma-Ray Bursts |
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