EVIDENCE OF BULK ACCELERATION OF THE GRB X-RAY FLARE EMISSION REGION
ABSTRACT Applying our recently developed generalized version of the high-latitude emission theory to the observations of X-ray flares in gamma-ray bursts (GRBs), here we present clear observational evidence that the X-ray flare emission region is undergoing rapid bulk acceleration as the photons are...
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| Veröffentlicht in: | Astrophysical journal. Letters 2016-06, Vol.824 (1), p.L16-L16 |
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| container_title | Astrophysical journal. Letters |
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| creator | Uhm, Z. Lucas Zhang, Bing |
| description | ABSTRACT Applying our recently developed generalized version of the high-latitude emission theory to the observations of X-ray flares in gamma-ray bursts (GRBs), here we present clear observational evidence that the X-ray flare emission region is undergoing rapid bulk acceleration as the photons are emitted. We show that both the observed X-ray flare light curves and the photon index evolution curves can be simultaneously reproduced within a simple physical model invoking synchrotron radiation in an accelerating emission region far from the GRB central engine. Such an acceleration process demands an additional energy dissipation source other than kinetic energy, which points toward a significant Poynting flux in the emission region of X-ray flares. As the X-ray flares are believed to share a similar physical mechanism as the GRB prompt emission, our finding here hints that the GRB prompt emission jets may also carry a significant Poynting flux in their emitting region. |
| doi_str_mv | 10.3847/2041-8205/824/1/L16 |
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Lucas ; Zhang, Bing</creator><creatorcontrib>Uhm, Z. Lucas ; Zhang, Bing</creatorcontrib><description>ABSTRACT Applying our recently developed generalized version of the high-latitude emission theory to the observations of X-ray flares in gamma-ray bursts (GRBs), here we present clear observational evidence that the X-ray flare emission region is undergoing rapid bulk acceleration as the photons are emitted. We show that both the observed X-ray flare light curves and the photon index evolution curves can be simultaneously reproduced within a simple physical model invoking synchrotron radiation in an accelerating emission region far from the GRB central engine. Such an acceleration process demands an additional energy dissipation source other than kinetic energy, which points toward a significant Poynting flux in the emission region of X-ray flares. 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All rights reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c525t-57e1c4ac58f71a81757ef402ec7e29b9556c37292c7efdd1962e6176928bb8633</citedby><cites>FETCH-LOGICAL-c525t-57e1c4ac58f71a81757ef402ec7e29b9556c37292c7efdd1962e6176928bb8633</cites><orcidid>0000-0002-9725-2524</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.3847/2041-8205/824/1/L16/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>230,314,776,780,881,27903,27904,38847,38869,53818,53845</link.rule.ids><linktorsrc>$$Uhttps://iopscience.iop.org/article/10.3847/2041-8205/824/1/L16$$EView_record_in_IOP_Publishing$$FView_record_in_$$GIOP_Publishing</linktorsrc><backlink>$$Uhttps://www.osti.gov/biblio/22654298$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Uhm, Z. Lucas</creatorcontrib><creatorcontrib>Zhang, Bing</creatorcontrib><title>EVIDENCE OF BULK ACCELERATION OF THE GRB X-RAY FLARE EMISSION REGION</title><title>Astrophysical journal. Letters</title><addtitle>APJL</addtitle><addtitle>Astrophys. J. Lett</addtitle><description>ABSTRACT Applying our recently developed generalized version of the high-latitude emission theory to the observations of X-ray flares in gamma-ray bursts (GRBs), here we present clear observational evidence that the X-ray flare emission region is undergoing rapid bulk acceleration as the photons are emitted. We show that both the observed X-ray flare light curves and the photon index evolution curves can be simultaneously reproduced within a simple physical model invoking synchrotron radiation in an accelerating emission region far from the GRB central engine. Such an acceleration process demands an additional energy dissipation source other than kinetic energy, which points toward a significant Poynting flux in the emission region of X-ray flares. As the X-ray flares are believed to share a similar physical mechanism as the GRB prompt emission, our finding here hints that the GRB prompt emission jets may also carry a significant Poynting flux in their emitting region.</description><subject>ACCELERATION</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>COSMIC GAMMA BURSTS</subject><subject>EMISSION</subject><subject>ENERGY LOSSES</subject><subject>EVOLUTION</subject><subject>Flares</subject><subject>Flux</subject><subject>GAMMA RADIATION</subject><subject>Gamma ray bursts</subject><subject>gamma-ray burst: general</subject><subject>KINETIC ENERGY</subject><subject>PHOTONS</subject><subject>radiation mechanisms: non-thermal</subject><subject>relativistic processes</subject><subject>RELATIVISTIC RANGE</subject><subject>SYNCHROTRON RADIATION</subject><subject>SYNCHROTRONS</subject><subject>VISIBLE RADIATION</subject><subject>X RADIATION</subject><subject>X rays</subject><issn>2041-8205</issn><issn>2041-8213</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNqNkU1PhDAQhonRxM9f4IXExHhBOqWl5chidyWim-Bq9NSw3RLZsAtS9uC_twSjF2O8zMc7z8zhHcc5B3QdcMJ8jAh4HCPqc0x88DMI95yjLxWC_e8a0UPn2Jg1QhiFwI-cG_Gc3oiHRLjzqTt5yu7cOElEJvJ4kc4fBnFxK9xZPnFfvDx-dadZnAtX3KePj8M8FzObTp2DsqiNPvvKJ87TVCySWy-bz9IkzjxFMe09yjQoUijKSwYFB2aFkiCsFdM4WkaUhipgOMK2L1criEKsQ2BhhPlyycMgOHEuxruN6StpVNVr9aaa7VarXmIcUoIjbqmrkWq75n2nTS83lVG6routbnZGAucEMCMA_0AZs6ahCFk0GFHVNcZ0upRtV22K7kMCksMT5GCxHCy2gUiQ9gl263LcqppWrptdt7X-yKJd1z-QbFelBf1fwL9OfwLhiYvf</recordid><startdate>20160610</startdate><enddate>20160610</enddate><creator>Uhm, Z. Lucas</creator><creator>Zhang, Bing</creator><general>The American Astronomical Society</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0002-9725-2524</orcidid></search><sort><creationdate>20160610</creationdate><title>EVIDENCE OF BULK ACCELERATION OF THE GRB X-RAY FLARE EMISSION REGION</title><author>Uhm, Z. Lucas ; Zhang, Bing</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c525t-57e1c4ac58f71a81757ef402ec7e29b9556c37292c7efdd1962e6176928bb8633</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>ACCELERATION</topic><topic>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</topic><topic>COSMIC GAMMA BURSTS</topic><topic>EMISSION</topic><topic>ENERGY LOSSES</topic><topic>EVOLUTION</topic><topic>Flares</topic><topic>Flux</topic><topic>GAMMA RADIATION</topic><topic>Gamma ray bursts</topic><topic>gamma-ray burst: general</topic><topic>KINETIC ENERGY</topic><topic>PHOTONS</topic><topic>radiation mechanisms: non-thermal</topic><topic>relativistic processes</topic><topic>RELATIVISTIC RANGE</topic><topic>SYNCHROTRON RADIATION</topic><topic>SYNCHROTRONS</topic><topic>VISIBLE RADIATION</topic><topic>X RADIATION</topic><topic>X rays</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Uhm, Z. Lucas</creatorcontrib><creatorcontrib>Zhang, Bing</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Technology Research Database</collection><collection>Aerospace Database</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>Uhm, Z. Lucas</au><au>Zhang, Bing</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>EVIDENCE OF BULK ACCELERATION OF THE GRB X-RAY FLARE EMISSION REGION</atitle><jtitle>Astrophysical journal. Letters</jtitle><stitle>APJL</stitle><addtitle>Astrophys. J. Lett</addtitle><date>2016-06-10</date><risdate>2016</risdate><volume>824</volume><issue>1</issue><spage>L16</spage><epage>L16</epage><pages>L16-L16</pages><issn>2041-8205</issn><eissn>2041-8213</eissn><abstract>ABSTRACT Applying our recently developed generalized version of the high-latitude emission theory to the observations of X-ray flares in gamma-ray bursts (GRBs), here we present clear observational evidence that the X-ray flare emission region is undergoing rapid bulk acceleration as the photons are emitted. We show that both the observed X-ray flare light curves and the photon index evolution curves can be simultaneously reproduced within a simple physical model invoking synchrotron radiation in an accelerating emission region far from the GRB central engine. Such an acceleration process demands an additional energy dissipation source other than kinetic energy, which points toward a significant Poynting flux in the emission region of X-ray flares. 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| subjects | ACCELERATION ASTROPHYSICS, COSMOLOGY AND ASTRONOMY COSMIC GAMMA BURSTS EMISSION ENERGY LOSSES EVOLUTION Flares Flux GAMMA RADIATION Gamma ray bursts gamma-ray burst: general KINETIC ENERGY PHOTONS radiation mechanisms: non-thermal relativistic processes RELATIVISTIC RANGE SYNCHROTRON RADIATION SYNCHROTRONS VISIBLE RADIATION X RADIATION X rays |
| title | EVIDENCE OF BULK ACCELERATION OF THE GRB X-RAY FLARE EMISSION REGION |
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