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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Bright X-Ray Flares from the BL Lac Object Markarian 421, Detected with MAXI in 2010 January and February
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Bright X-Ray Flares from the BL Lac Object Markarian 421, Detected with MAXI in 2010 January and February

机译：BL Lac对象Markarian 421发出的明亮X射线耀斑，于2010年1月和2月用MAXI检测到

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StrongX-rayflaresfromtheblazarMrk421weredetectedin2010JanuaryandFebruarythrough7-monthmonitoringwiththeMAXIGSC.Themaximum2a€“10keVfluxintheJanuaryandFebruaryflareswasmeasuredtobe120$$pm$$10mCraband164$$pm$$17mCrab,respectively;thelatteristhehighestamongthosereportedfromtheobject.AcomparisonoftheMAXIandSwiftBATdatasuggestsaconvexX-rayspectrumwithanapproximatedphotonindexof$$Gamma$$$$gtrsim$$2.ThisspectrumisconsistentwithapicturethatMAXIisobservingnearthesynchrotronpeakfrequency.Thesourceexhibitedaspectralvariationduringtheseflares,slightlydifferentfromthoseinpreviousobservations,inwhichthepositivecorrelationbetweenthefluxandhardnesswaswidelyreported.ByequatingthehalvingdecaytimescaleintheJanuaryflare,$$t_{md}$$$$sim$$2.5$$ imes$$10$$^{4}$$s,tothesynchrotroncoolingtime,themagneticfieldwasevaluatedtobe$$B$$$$sim$$4.5$$ imes$$10$$^{-2}$$G($$delta/$$10)$$^{-1/3}$$,where$$delta$$isthejetbeamingfactor.Assumingthatthelightcrossingtimeoftheemissionregionisshorterthanthedoublingrisetime,$$t_{mr}$$$$lesssim$$2$$ imes$$10$$^{4}$$s,theregionsizewasroughlyestimatedas$$R$$$$$$6$$ imes$$10$$^{15}$$cm($$delta/$$10).Theseresultsareconsistentwithvaluespreviouslyreported.FortheFebruaryflare,therisetime,$$t_{mr}$$$$$$1.3$$ imes$$10$$^{5}$$s,givesalooseupperlimitonthesizeas$$R$$$$$$4$$ imes$$10$$^{16}$$cm$$(delta/10)$$,althoughthelongerdecaytime,$$t_{md}$$$$sim$$1.4$$ imes$$10$$^{5}$$s,indicates$$B$$$$sim$$1.5$$ imes$$10$$^{-2}$$G($$delta/$$10)$$^{-1/3}$$,whichisweakerthanthepreviousresults.Thiscouldbereconciledbyinvokingascenariothatthisflareisasuperpositionofunresolvedeventswithashortertimescale.
机译：StrongX-rayflaresfromtheblazarMrk421weredetectedin2010JanuaryandFebruarythrough7-monthmonitoringwiththeMAXIGSC.Themaximum2a€“10keVfluxintheJanuaryandFebruaryflareswasmeasuredtobe120 $$下午$$ 10mCraband164 $$下午$$ 17mCrab，分别; thelatteristhehighestamongthosereportedfromtheobject.AcomparisonoftheMAXIandSwiftBATdatasuggestsaconvexX-rayspectrumwithanapproximatedphotonindexof $$伽玛$$$$ gtrsim $$ 2.ThisspectrumisconsistentwithapicturethatMAXIisobservingnearthesynchrotronpeakfrequency.Thesourceexhibitedaspectralvariationduringtheseflares，slightlydifferentfromthoseinpreviousobservations，inwhichthepositivecorrelationbetweenthefluxandhardnesswaswidelyreported.ByequatingthehalvingdecaytimescaleintheJanuaryflare ，$$ t_ {md} $$$$ sim $$ 2.5 $$ imes $$ 10 $$ ^ {4} $$ s，到同步加速器冷却时间，磁场被评估为$$ B $$$ sim $ 4.5 $$ imes $$ 10 $$ ^ {-2} $$ G（$$ delta / $$ 10）$$ ^ {-1/3} $$，其中$$ delta $$是喷射光束因子。假设发射区域的光交叉时间短于倍增时间，$$ t_ {mr} $$$$ lesssim $$ 2 $$ imes $$ 10 $$ ^ {4} $$ s，区域大小被粗略估计为$$ R $$$ $$ 6 $$ imes $$ 10 $$ ^ {15} $$ cm（$ $ delta / $$ 10）。这些结果与先前报告的值一致。对于二月耀斑，时间，$$ t_ {mr} $$$$ $$ 1.3 $$ imes $$ 10 $$ {{5} $$ s，givesalooseupperlimitupthesizeas $$ R $$$$ $$ 4 $$ imes $$ 10 $$ ^ {16} $$ cm $$（delta / 10）$$，尽管更长的衰减时间，$$ t_ {md} $$$$ sim $ 1.4 $$ imes $$ 10 $$ ^ {5} $$ s，表示$$ B $$$$ simsim $ 1.5 $$ imes $$ 10 $$ ^ {-2} $$ G（$$ delta / $$ 10）$$ ^ {-1/3 } $$，其结果比以前的结果要弱。这可以通过考虑在更短的时间范围内这种未解决事件的火炬叠加来解决。

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