XMM-Newton Observations of NGC 4051: Temporal Flux and Spectral Variability during Transition to the Faintest Phase in NGC 4051

Haba Yoshito; Liebmann Andrew C.; Fukumura Keigo; Kunieda Hideyo; Tsuruta Sachiko

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XMM-Newton Observations of NGC 4051: Temporal Flux and Spectral Variability during Transition to the Faintest Phase in NGC 4051

机译：NMM 4051的XMM-牛顿观测：NGC 4051过渡到最薄相期间的时间通量和光谱变异性

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WereportontheresultsfromtemporalandspectralanalysesofNGC4051observedwithXMM-Newton.TheX-rayvariabilitiesinthehigher-fluxstatesarewellexplainedbythecombinationofavariable,directpowerlawandatemporallystable,absorbedcomponent.Inlow-fluxstates,however,spectralvariationsaremainlyduetofluxchangesoftheabsorbedcomponent.Furthermore,whenthesourceentersintothelowest-fluxstate,theabsorbedcomponentnolongerappears.Onepromisinginterpretationisthatpartofthecentralemissionregioniscoveredbyatemporallystablematerial,whilethesizeoftheemissionregionvariessoastoproduceafluxvariationpredominantlyindirectpower-lawcomponent.Oncetheemissionregionbecomessmallerthanthesizeoftheabsorber,however,theabsorbedfluxalsobeginstodecrease.Finally,whentheemissionregionisreducedsufficiently,boththedirectandabsorbedcomponentsdisappear(i.e.,a€?switchedoffa€?state).Inthisstate,wefoundthesignatureofthermalemission,whosetemperatureof0.8keVisinagreementwiththeaveragevalueobtainedfromstatisticalanalysesofSeyfert2galaxieswithstarburstactivity.ThiscouldsuggestthatNGC4051possessesanuclearstarburstregion.

机译：WereportontheresultsfromtemporalandspectralanalysesofNGC4051observedwithXMM-Newton.TheX-rayvariabilitiesinthehigher-fluxstatesarewellexplainedbythecombinationofavariable，directpowerlawandatemporallystable，absorbedcomponent.Inlow-fluxstates然而，spectralvariationsaremainlyduetofluxchangesoftheabsorbedcomponent.Furthermore，whenthesourceentersintothelowest-fluxstate，theabsorbedcomponentnolongerappears.Onepromisinginterpretationisthatpartofthecentralemissionregioniscoveredbyatemporallystablematerial，whilethesizeoftheemissionregionvariessoastoproduceafluxvariationpredominantlyindirectpower-lawcomponent.Oncetheemissionregionbecomessmallerthanthesizeoftheabsorber然而，theabsorbedfluxalsobeginstodecrease.Finally，whentheemissionregionisreducedsufficiently，boththedirectandabsorbedcomponentsdisappear（即，在这种状态下，我们发现了热辐射的特征，其温度为0.8 keVi，符合从Seyfert2星系进行统计分析得出的平均值第一次活动。这可能表明NGC4051拥有核爆星区。

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《PASJ: Publications of the Astronomical Society of Japan》 |2008年第6期|共页
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Haba Yoshito; Liebmann Andrew C.; Fukumura Keigo; Kunieda Hideyo; Tsuruta Sachiko;
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1. XMM-Newton Observations of NGC 4051:Temporal Flux and Spectral Variability during Transition to the Faintest Phase inNGC 4051 [J] . Yoshito HABA, Andrew C.LIEBMANN, Keigo FUKUMURA, PASJ: Publications of the Astronomical Society of Japan . 2008,第6期

机译：NMM 4051的XMM-牛顿观测：NGC 4051过渡到最细相的过程中的时间通量和光谱变异性
2. Spectral Variability and Iron Line Emission in the ASCA Observations of the Seyfert 1 Galaxy NGC 4051 [J] . Guainazzi Matteo, Mihara Tatehiro, Otani Chiko, PASJ: Publications of the Astronomical Society of Japan . 1996,第6期

机译：Seyfert 1 Galaxy NGC 4051的ASCA观测中的光谱变异性和铁线发射
3. XMM-NEWTON OBSERVATIONS OF A POSSIBLE LIGHT ECHO IN THE SEYFERT 1 NUCLEUS OF NGC 4051 [J] . K. O. MASON, I. M. MCHARDY, M. J. PAGE, The Astrophysical journal . 2002,第2aaParta2期

机译：NGC 4051的SEYFERT 1核中可能存在的光回波的XMM-牛顿观测
4. A NEW INTERPRETATION OF THE X-RAY SPECTRAL VARIABILITY OF NGC 4051 [C] . G. Ponti, G. Miniutti, M. Cappi, Conference X-ray Universe . 2006

机译：NGC 4051的X射线光谱变异性的新解释
5. Increasing a telescope's field of view and subsequent observations of galaxies NGC4244 and NGC5907 [D] . Marcus, David Alan 1996

机译：增加望远镜的视场和对星系NGC4244和NGC5907的后续观测
6. Phase II study of neoadjuvant therapy with docetaxel cisplatin panitumumab and radiation therapy followed by surgery in patients with locally advanced adenocarcinoma of the distal esophagus (ACOSOG Z4051) [O] . A C Lockhart, C E Reed, P A Decker, -1

机译：多西紫杉醇顺铂帕尼单抗和放疗的新辅助治疗II期研究然后对远端食管远端局部腺癌患者进行手术治疗（ACOSOG Z4051）
7. XMM-Newton Observations of NGC 4051: Temporal Flux and Spectral Variability during Transition to the Faintest Phase in NGC 4051 [O] . Yoshito Haba, Andrew C. Liebmann, Keigo Fukumura, 2008

机译：XMM-Newton对NGC 4051的观察：在过渡期间到NGC 4051中的最微量阶段的时间通量和光谱可变性
8. Rapid X-Ray Variability from the Seyfert 1 Galaxy NGC 4051 [R] . Marshall, F. E., Holt, S. S., Mushotzky, R. F., 1983

机译：seyfert 1 Galaxy NGC 4051的快速X射线可变性

XMM-Newton Observations of NGC 4051: Temporal Flux and Spectral Variability during Transition to the Faintest Phase in NGC 4051

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