{"title":"揭示LS 5039中发射器的线索:强大的喷流与碰撞风","authors":"V. Bosch-Ramon, D. Khangulyan, F. Aharonian","doi":"10.1063/1.3076645","DOIUrl":null,"url":null,"abstract":"LS 5039 is among the most interesting VHE sources in the Galaxy. Two scenarios have been put forward to explain the observed TeV radiation: jets vs pulsar winds. The source has been detected during the superior conjunction of the compact object, when very large gamma‐ray opacities are expected. In addition, electromagnetic cascades, which may make the system more transparent to gamma‐rays, are hardly efficient for realistic magnetic fields in massive star surroundings. All this makes unlikely the standard pulsar scenario for LS 5039, in which the emitter is the region located between the star and the compact object, where the opacities are the largest. Otherwise, a jet‐like flow can transport energy to regions where the photon‐photon absorption is much lower and the TeV radiation is not so severely absorbed.","PeriodicalId":8453,"journal":{"name":"arXiv: Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2008-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Clues to unveil the emitter in LS 5039: powerful jets vs colliding winds\",\"authors\":\"V. Bosch-Ramon, D. Khangulyan, F. Aharonian\",\"doi\":\"10.1063/1.3076645\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"LS 5039 is among the most interesting VHE sources in the Galaxy. Two scenarios have been put forward to explain the observed TeV radiation: jets vs pulsar winds. The source has been detected during the superior conjunction of the compact object, when very large gamma‐ray opacities are expected. In addition, electromagnetic cascades, which may make the system more transparent to gamma‐rays, are hardly efficient for realistic magnetic fields in massive star surroundings. All this makes unlikely the standard pulsar scenario for LS 5039, in which the emitter is the region located between the star and the compact object, where the opacities are the largest. Otherwise, a jet‐like flow can transport energy to regions where the photon‐photon absorption is much lower and the TeV radiation is not so severely absorbed.\",\"PeriodicalId\":8453,\"journal\":{\"name\":\"arXiv: Astrophysics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2008-11-21\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"arXiv: Astrophysics\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1063/1.3076645\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv: Astrophysics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1063/1.3076645","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
LS 5039是银河系中最有趣的VHE源之一。人们提出了两种情况来解释观测到的TeV辐射:喷流vs脉冲星风。该源是在致密天体的超合期间探测到的，届时伽马射线的不透明度将非常大。此外，电磁级联可能使系统对伽马射线更加透明，但对大质量恒星环境中的实际磁场几乎没有效率。所有这些都使LS 5039的标准脉冲星场景变得不太可能，在标准脉冲星场景中，发射器位于恒星和致密物体之间的区域，那里的不透明度最大。否则，像射流一样的流可以将能量输送到光子-光子吸收低得多、TeV辐射吸收不那么严重的区域。
Clues to unveil the emitter in LS 5039: powerful jets vs colliding winds
LS 5039 is among the most interesting VHE sources in the Galaxy. Two scenarios have been put forward to explain the observed TeV radiation: jets vs pulsar winds. The source has been detected during the superior conjunction of the compact object, when very large gamma‐ray opacities are expected. In addition, electromagnetic cascades, which may make the system more transparent to gamma‐rays, are hardly efficient for realistic magnetic fields in massive star surroundings. All this makes unlikely the standard pulsar scenario for LS 5039, in which the emitter is the region located between the star and the compact object, where the opacities are the largest. Otherwise, a jet‐like flow can transport energy to regions where the photon‐photon absorption is much lower and the TeV radiation is not so severely absorbed.
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