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Modeling the high-energy emission from the gamma-ray binary 1FGL J1018.6–5856

Research in Astronomy and Astrophysics 2021年第8期21卷 46-58页

作者： A-Ming Chen Chowing Ng Jumpei Takata Yun-Wei Yu School of physics Huazhong University of Science and TechnologyWuhan 430074China Department of Physics The University of Hong KongPokfulam RoadHong KongChina College of Physical Science and Technology Central China Normal UniversityWuhan 430079China

1FGL J1018.6–5856 is a high mass gamma-ray binary containing a compact object orbiting around a massive star with a period of 16.544 *** the compact object is a pulsar,non-thermal emissions are likely produced by electrons accelerated at the termination shock,and may also originate from the magnetosphere and the un-shocked wind of the *** this paper,we investigate the non-thermal emissions from the wind and the shock with different viewing geometries and study the multi-wavelength emissions from 1FGL J1018.6–*** present the analysis results of the Fermi/LAT using nearly 10 years of *** phase-resolved spectra indicate that the Ge V emissions comprise a rather steady component that does not vary with orbital motion and a modulated component that shows flux maximum around inferior *** ke V/Te V light curves of 1FGL J1018.6–5856 also exhibit a sharp peak around inferior conjunction,which are attributed to the boosted emission from the shock,while the broad sinusoidal modulations could be originating from the deflected shock tail at a larger *** modulations of Ge V flux are likely caused by the boosted synchrotron emission from the shock and the IC emission from the unshocked pulsar wind,while the steady component comes from the outer gap of the pulsar ***,we discuss the similarities and differences of 1FGL J1018.6–5856 with other binaries,like LS 5039.

关键词： binaries:close gamma rays:stars X-rays:binaries radiation mechanisms:non-thermal

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Searching for γ-ray emission from LOTAAS pulsars

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Research in Astronomy and Astrophysics 2021年第3期21卷 61-68页

作者： Qi-Wei Lu Zhong-Xiang Wang Yi Xing Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China University of the Chinese Academy of Sciences Beijing 100049China Department of Astronomy Yunnan UniversityKunming 650091China

The LOw-Frequency ARray(LOFAR)has recently conducted a survey(LOFAR Tied-Array Allsky Survey;LOTAAS)for pulsars in the Northern hemisphere that resulted in discoveries of 73 new *** the purpose of studying the properties of these pulsars,we search for theirγ-ray counterparts using the all-sky survey data obtained with the Large Area Telescope(LAT)onboard the Fermi gamma-Ray Space Telescope(Fermi).We analyze the LAT data for 70 LOTAAS pulsars(excluding two millisecond pulsars and one with the longest known spin period of 23.5 s).We find one candidate counterpart to PSR J1017+30,which should be searched for theγ-ray pulsation signal once its timing solution is *** other LOTAAS pulsars,we derive their 0.3-500 GeV flux upper *** order to compare the LOTAAS pulsars with the knownγ-ray pulsars,we also derive the 0.3-500 GeVγ-ray fluxes for 112 of the latter contained in the Fermi LAT fourth source *** on the properties of theγ-ray pulsars,we derive upper limits on the spin-down luminosities of the LOTAAS *** upper limits are not very constraining but help suggest that most of the LOTAAS pulsars probably have<10^(33) erg s^(-1) spin-down luminosities and are not expected to be detectable with Fermi LAT.

关键词： stars:pulsars stars:neutron gamma rays:stars

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