HIGH-ENERGY OBSERVATIONS OF PSR B1259−63/LS 2883 THROUGH THE 2014 PERIASTRON PASSAGE: CONNECTING X-RAYS TO THE GeV FLARE
HIGH-ENERGY OBSERVATIONS OF PSR B1259−63/LS 2883 THROUGH THE 2014 PERIASTRON PASSAGE: CONNECTING X-RAYS TO THE GeV FLARE
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DOI：
10.1088/2041-8205/798/1/l26
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发表时间：
2014-12
期刊：
影响因子：
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通讯作者：
P. Tam;Kwan-Lok Li;J. Takata;A. Okazaki;C. Hui;A. Kong
中科院分区：
文献类型：
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作者：
P. Tam;Kwan-Lok Li;J. Takata;A. Okazaki;C. Hui;A. Kong
双星系统PSRB1259−63/LS2883在无线电、X射线和TeVγ射线中都有很好的采样，并且在这些频率中显示出与轨道相位相关的变化。第一次探测到来自该系统的Gevγ射线是在2010年的近星体通道上。在这封信中，我们分析了SWIFT/XRT、NuSTAR/FPM和FERMI/LAT通过2014年5月4日最近的近日子通道获得的X射线和γ数据。虽然在这次通道之前和期间，PSRB1259−63/LS2883没有被探测到，但我们证明了GeV耀斑发生在与2011年初类似的轨道阶段，从而建立了后太阳活动子耀斑的重复性。观测到了多个耀斑，每个耀斑持续几天，也可以看到短期变化。我们还首次发现了与GeV耀斑同时发生的X射线通量变化。KeV到GeV连接的有力证据来自宽带高能谱，我们将其解释为来自受冲击的脉冲星风的同步辐射。
The binary system PSR B1259−63/LS 2883 is well sampled in radio, X-rays, and TeV γ-rays, and shows orbital-phase-dependent variability in these frequencies. The first detection of GeV γ-rays from the system was made around the 2010 periastron passage. In this Letter, we present an analysis of X-ray and γ-ray data obtained by the Swift/XRT, NuSTAR/FPM, and Fermi/LAT, through the recent periastron passage which occurred on 2014 May 4. While PSR B1259−63/LS 2883 was not detected by the Large Area Telescope before and during this passage, we show that the GeV flares occurred at a similar orbital phase as in early 2011, thus establishing the repetitive nature of the post-periastron GeV flares. Multiple flares each lasting for a few days have been observed and short-term variability is seen as well. We also found X-ray flux variation contemporaneous with the GeV flare for the first time. Strong evidence of the keV-to-GeV connection came from the broadband high-energy spectra, which we interpret as synchrotron radiation from the shocked pulsar wind.