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Investigation of the energy dependence of the orbital light curve in LS 5039
Chang Z(常治); Zhang S(张澍); Ji L(纪龙); Chen YP(陈玉鹏); Liu CZ(刘聪展); Chang, Z; Zhang, S; Ji, L; Chen, YP; Kretschmar, P; Kuulkers, E; Collmar, W; Liu, CZ
2016
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号463期号:1页码:495
通讯作者常治
摘要LS 5039 is so far the best-studied gamma-ray binary system at multiwavelength energies. A time-resolved study of its spectral energy distribution (SED) shows that above 1 keV its power output is changing along its binary orbit as well as being a function of energy. To disentangle the energy dependence of the power output as a function of orbital phase, we investigated in detail the orbital light curves as derived with different telescopes at different energy bands. We analysed the data from all existing International Gamma-Ray Astrophysics Laboratory (INTEGRAL)/INTEGRAL on-board Imager/INTEGRAL Soft Gamma-Ray Imager observations of the source and generated the most up-to-date orbital light curves at hard X-ray energies. In the gamma-ray band, we carried out orbital phase-resolved analysis of Fermi-Large Area Telescope (LAT) data between 30 MeV and 10 GeV in five different energy bands. We found that, at (2)100 MeV and (3)1 TeV the peak of the gamma-ray emission is near orbital phase 0.7, while between 100 MeV and 1 GeV it moves close to orbital phase 1.0 in an orbital anticlockwise manner. This result suggests that the transition region in the SED at soft gamma-rays (below a hundred MeV) is related to the orbital phase interval of 0.5-1.0 but not to the one of 0.0-0.5, when the compact object is 'behind' its companion. Another interesting result is that between 3 and 20 GeV no orbital modulation is found, although Fermi-LAT significantly (18 sigma) detects LS 5039. This is consistent with the fact that at these energies, the contributions to the overall emission from the inferior conjunction phase region (INFC, orbital phase 0.45-0.9) and from the superior conjunction phase region (orbital phase 0.9-0.45) are equal in strength. At TeV energies the power output is again dominant in the INFC region and the flux peak occurs at phase 0.7.
文章类型Article
关键词gamma-rays: stars X-rays: individual: LS 5039
DOI10.1093/mnras/stw2009
关键词[WOS]GAMMA-RAY EMISSION ; LARGE-AREA TELESCOPE ; BINARY ; DISCOVERY ; PULSAR ; I+61-DEGREES-303 ; HYDRODYNAMICS ; MISSION ; SYSTEMS ; LS-5039
语种英语
WOS记录号WOS:000386464900039
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/260802
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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Chang Z,Zhang S,Ji L,et al. Investigation of the energy dependence of the orbital light curve in LS 5039[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,463(1):495.
APA 常治.,张澍.,纪龙.,陈玉鹏.,刘聪展.,...&Liu, CZ.(2016).Investigation of the energy dependence of the orbital light curve in LS 5039.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,463(1),495.
MLA 常治,et al."Investigation of the energy dependence of the orbital light curve in LS 5039".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 463.1(2016):495.
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