Proceedings of High Energy Astrophysics in Southern Africa — PoS(HEASA2018)最新文献

筛选

英文中文

Yonetoku relation of Fermi-GBM and Swift-BATgamma-ray bursts 费米- gbm与斯威夫特-巴伽玛暴的米德关系

Proceedings of High Energy Astrophysics in Southern Africa — PoS(HEASA2018) Pub Date : 2018-08-01 DOI: 10.22323/1.338.0012

F. Dirirsa, S. Razzaque

引用次数: 0

Spectral Variability Signatures of Relativistic Shocks in Blazars 耀变体中相对论激波的光谱变异性特征

Proceedings of High Energy Astrophysics in Southern Africa — PoS(HEASA2018) Pub Date : 2018-08-01 DOI: 10.22323/1.338.0031

M. Boettcher, M. Baring

{"title":"Spectral Variability Signatures of Relativistic Shocks in Blazars","authors":"M. Boettcher, M. Baring","doi":"10.22323/1.338.0031","DOIUrl":"https://doi.org/10.22323/1.338.0031","url":null,"abstract":"Mildly relativistic, oblique shocks are frequently invoked as possible sites of relativistic particle acceleration and production of strongly variable, polarized multi-wavelength emission from relativistic jet sources such as blazars, via diffusive shock acceleration (DSA). In recent work, we had self-consistently coupled DSA and radiation transfer simulations in blazar jets. These one-zone models determined that the observed spectral energy distributions (SEDs) of blazars strongly constrain the nature of the hydromagnetic turbulence responsible for pitch-angle scattering. In this paper, we expand our previous work by including full time dependence and treating two emission zones, one being the site of acceleration. This modeling is applied to a multiwavelength flare of the flat spectrum radio quasar 3C~279, fitting snap-shot SEDs and light curves. We predict spectral hysteresis patterns in various energy bands as well as cross-band time lags with optical and GeV gamma-rays as well as radio and X-rays tracing each other closely with zero time lag, but radio and X-rays lagging behind the optical and gamma-ray variability by several hours.","PeriodicalId":192581,"journal":{"name":"Proceedings of High Energy Astrophysics in Southern Africa — PoS(HEASA2018)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131105548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Probing quantum gravity using high-energy astrophysics 利用高能天体物理学探测量子引力

Proceedings of High Energy Astrophysics in Southern Africa — PoS(HEASA2018) Pub Date : 2018-08-01 DOI: 10.22323/1.338.0022

J. Tarrant, G. Beck, S. Colafrancesco

{"title":"Probing quantum gravity using high-energy astrophysics","authors":"J. Tarrant, G. Beck, S. Colafrancesco","doi":"10.22323/1.338.0022","DOIUrl":"https://doi.org/10.22323/1.338.0022","url":null,"abstract":"The events observed by LIGO indicate the existence of a large population of intermediate mass black holes. This unexpected result lead to a resurgence in the interest in theories of the formation of primordial black holes with several studies showing that broad mass distributions can evade or satisfy the stringent constraints on monochromatic populations. If such large populations exist they provide the perfect test-bed for theories beyond the standard model of physics that modify black hole evolution. The case we studied is that of \"Planck stars\", a hypothetical modification of the black hole evolution where it explodes via quantum loop gravity motivated tunnelling. We determine what the high-frequency background signal of such objects exploding over the whole of cosmic history would look like for various black hole populations to place actual empirical constraints on quantum loop gravity via comparison to observed isotropic background signals at the same frequencies. We find that stringent constraints heavily restrict the amount of energy released via the high-energy channel, thereby casting doubt on whether or not the high-energy signal could result in gamma-ray bursts as speculated in the literature.","PeriodicalId":192581,"journal":{"name":"Proceedings of High Energy Astrophysics in Southern Africa — PoS(HEASA2018)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122702292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

首页上一页