Long-Term X-Ray Variability of Quasars in the Lockman Hole Field Observed with ROSAT

Ezoe Yu-ichiro; Iyomoto Naoko; Makishima Kazuo; Hasinger G??nter

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Long-Term X-Ray Variability of Quasars in the Lockman Hole Field Observed with ROSAT

机译：ROSAT观测的洛克曼孔场中类星体的长期X射线变异性

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AnimprovedmethodhasbeenutilizedtoestimatetheX-raypowerspectraldensities(PSD)andthevariationtimescalesofthreequasarsintheLockmanHolefield.FivearchivalROSATPSPCdatacoveringatwo-yearrangewereanalyzed.ToestimatePSDfromsparseandunevenly-sampledlightcurves,aforward-methodapproachwithextensiveMonteCarlosimulationswasadopted.Abrokenpower-lawtypePSDwithaconstantPoissonnoisecomponentwasassumedwithabreakfrequency,$$f_mathrm{b}$$.Then,assumingthePSDslope,$$alpha$$,tobe$$-2alpha-1,1/f_mathrm{b}$$wasconstrainedas$$gtrsim$$25daysforoneobject,whiletheconstraintsontheothertwoobjectswereveryweak.Thelong-timescaleoftheoneobjectisconsistentwiththeviewthatluminousAGNshostmassiveblackholes.

机译：AnimprovedmethodhasbeenutilizedtoestimatetheX-raypowerspectraldensities（PSD）andthevariationtimescalesofthreequasarsintheLockmanHolefield.FivearchivalROSATPSPCdatacoveringatwo-yearrangewereanalyzed.ToestimatePSDfromsparseandunevenly-sampledlightcurves，aforward-methodapproachwithextensiveMonteCarlosimulationswasadopted.Abrokenpower-lawtypePSDwithaconstantPoissonnoisecomponentwasassumedwithabreakfrequency，$$ f_mathrm {B} $$然后，assumingthePSDslope，$$阿尔法$$，砥$$ - 2LT; alphalt ; -1,1 / f_mathrm {b} $被限制为一个对象$$ gtrsim $$ 25天，而另一个对象受到的约束却微弱。该对象的长期标度与发光的AGN宿主有大量黑洞的观点一致。

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《PASJ: Publications of the Astronomical Society of Japan》 |2002年第6期|共页
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Ezoe Yu-ichiro; Iyomoto Naoko; Makishima Kazuo; Hasinger G??nter;
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7. Long-Term X-Ray Variability of Quasars in the Lockman Hole Field Observed with ROSAT [O] . Yu-ichiro Ezoe, Naoko Iyomoto, Kazuo Makishima, 2002

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Long-Term X-Ray Variability of Quasars in the Lockman Hole Field Observed with ROSAT

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