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Low/Hard State Spectra of GRO J1655$-$40 Observed with Suzaku

机译:朱古力观察到的GRO J1655 $-$ 40的低/硬态光谱

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TheGalacticblack-holebinaryGROJ1655$$-$$40,asourceharboringsuperluminaljets,wasobservedwithSuzakuon2005September22-23.Thesourcewasdetectedoverabroadandcontinuousenergyrangeof0.7-300keV,withanintensityof$$sim$$50mCrabat20keV.Atadistanceof3.2kpc,the0.7-300keVluminositywas$$sim$$5.2$$ imes$$10$$^{36}$$ergs$$^{-1}$$($$sim$$0.7%oftheEddingtonluminosityfora6$$M_{odot}$$blackhole).Thesourcewasinatypicallow/hardstate,exhibitingapower-lawshapedcontinuumwithaphotonindexof$$sim$$1.6.Duringtheobservation,thesourceintensitygraduallydecreasedby25%atenergiesabove$$sim$$3keV,andby35%below2keV.This,togetherwiththesoftX-rayspectratakenwiththeX-rayImagingSpectrometer(XIS),suggeststhepresenceofanindependentsoftcomponentthatcanberepresentedbyemissionfromacool($$sim$$0.2keV)disk.ThehardX-rayspectraobtainedwiththeHardX-rayDetectorrevealahigh-energyspectralcutoff,withan$$e$$-foldingenergyof$$sim$$200keV.Theentire0.7-300keVspectrumcannotbereproducedbyasinglethermalComptonizationmodel,evenwhenconsideringreflectioneffects.Instead,thespectrum(exceptthesoftexcess)canbesuccessfullyexplainedbyinvokingtwothermal-Comptonizationcomponentswithdifferent$$y$$-parameters.Incontrasttothehigh/softstatespectraofthisobject,inwhichnarrowironabsorptionlinesaredetectedwithequivalentwidthsof60-100eV,thepresentXISspectrabearnosuchfeaturesbeyondanupper-limitequivalentwidthof23eV.
机译:TheGalacticblack-holebinaryGROJ1655 $$ - $$ 40,asourceharboringsuperluminaljets,wasobservedwithSuzakuon2005September22-23.Thesourcewasdetectedoverabroadandcontinuousenergyrangeof0.7-300keV,withanintensityof $$ SIM $$ 50mCrabat20keV.Atadistanceof3.2kpc,the0.7-300keVluminositywas $$ SIM $$ 5.2 $$的IME $$ 10 $$ ^ {36} $$ ergs $$ ^ {-1} $$($ 6%$ M_ {odot} $$ blackhole的Eddington发光度的$%sim $$ 0.7%)。该源呈浅紫色/硬态,表现出幂律型连续光子,光子指数为$ sim $ 1.6。在3keV以上时,光源强度逐渐降低25%,在2keV以下则降低35%。这与X射线成像光谱仪(XIS)一起拍摄的软X射线光谱一起,建议可以认为该X的独立软部件的存在可能与被加热的(保持)的$$的热量保持相同,这是因为从高光($)到($)的热量一直存在。 $ sim $ 200keV的折光能量。整个0.7-300keV频谱即使考虑反射也无法产生dbyasinglethermal Comptonization模型。相反,频谱(软多余的除外)可以通过调用两个具有不同$$ y参数的热康顿化分量来得到充分解释。与此对象的高/软状态光谱相反,在这种情况下,检测到的窄铁吸收线的宽度等于或小于等于60eV的等效宽度,因此在XIS之前没有。

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