CAJ | 학술논문

利用直接解调方法分析COMPTEL VP1数据, 得到了脉冲星Geminga10—30 MeV脉冲辐射存在的证据: 全位相及分位相成像均得到了Geminga.分位相成像结果显示,光变曲线的峰值位于pulse 1附近,而其它位相区域只能给出上限.由于成像分析不存在选择效应,该成像结果表明, Geminga在MeV能区仍存在脉冲辐射.虽然Geminga的弱MeV辐射使得很难就VP1数据作时间分析,但仍得到了一些周期信号的迹象,并且与成像结果不相矛盾.进一步考察EGRET观测Geminga在30 MeV以上的强度比pulse 2/pulse 1,发现在VP1观测的较低能区, pulse 1有渐强于pulse2的趋势,这和我们在MeV能区的成像及时间分析结果相一致.成像得到的流强表明, Geminga的能谱至少在10 MeV以上不应出现偏折.
이용직접해조방법분석COMPTEL VP1수거, 득도료맥충성Geminga10—30 MeV맥충복사존재적증거: 전위상급분위상성상균득도료Geminga.분위상성상결과현시,광변곡선적봉치위우pulse 1부근,이기타위상구역지능급출상한.유우성상분석불존재선택효응,해성상결과표명, Geminga재MeV능구잉존재맥충복사.수연Geminga적약MeV복사사득흔난취VP1수거작시간분석,단잉득도료일사주기신호적적상,병차여성상결과불상모순.진일보고찰EGRET관측Geminga재30 MeV이상적강도비pulse 2/pulse 1,발현재VP1관측적교저능구, pulse 1유점강우pulse2적추세,저화아문재MeV능구적성상급시간분석결과상일치.성상득도적류강표명, Geminga적능보지소재10 MeV이상불응출현편절.
Evidence for 10—30 MeV pulsation from Geminga has been obtained in our reanalysis of the data from COMPTEL individual observation VP 1 with a direct demodulation method. Images of Geminga from both full phase data and phase-resolved data were derived in the energy range 10—30 MeV for VP 1. Imaging results from the phase-resolved data show that maximum of the light curve is in the phase region of pulse 1 and only upper limits can be given for the other three phase regions. Our imaging analyses are free from any selection effects and, therefore, give evidence for MeV pulsation from Geminga during VP 1. The 10—30 MeV timing analysis of Geminga for VP 1 is difficult due to the weakness of Geminga and the obtained faint indication, however, seems consistent with the imaging results obtained from phase-resolved data. Further check of intensity ratio of pulse 2/pulse 1 measured by EGRET at energies above 30 MeV during VP 1 suggests that intensity of pulse 1 should be stronger than that of pulse 2 at MeV energies, which is consistent with our COMPTEL results. With the obtained 10—30 MeV flux, we find the spectrum of Geminga does not show any break, at least at energies above 10 MeV.