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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >XMM-Newton Observations of NGC 4051:Temporal Flux and Spectral Variability during Transition to the Faintest Phase inNGC 4051
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XMM-Newton Observations of NGC 4051:Temporal Flux and Spectral Variability during Transition to the Faintest Phase inNGC 4051

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

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摘要

We report on the results from temporal and spectral analyses of NGC 4051 observed with XMM-Newton. TheX-ray variabilities in the higher-flux states are well explained by the combination of a variable, direct power lawand a temporally stable, absorbed component. In low-flux states, however, spectral variations are mainly due to fluxchanges of the absorbed component. Furthermore, when the source enters into the lowest-flux state, the absorbedcomponent no longer appears. One promising interpretation is that part of the central emission region is covered bya temporally stable material, while the size of the emission region varies so as to produce a flux variation predom-inantly in direct power-law component. Once the emission region becomes smaller than the size of the absorber,however, the absorbed flux also begins to decrease. Finally, when the emission region is reduced sufficiently, both thedirect and absorbed components disappear (i.e., "switched off" state). In this state, we found the signature of thermalemission, whose temperature of 0.8 keV is in agreement with the average value obtained from statistical analyses ofSeyfert 2 galaxies with starburst activity. This could suggest that NGC 4051 possesses a nuclear starburst region.
机译：我们报告了使用XMM-Newton观测到的NGC 4051的时间和光谱分析结果。高通量状态下的X射线变异性通过可变的直接幂定律和时间稳定的吸收分量的组合得到很好的解释。但是，在低通量状态下，光谱变化主要归因于被吸收组分的通量变化。此外，当离子源进入最低通量状态时，不再出现被吸收的组分。一种有希望的解释是，中心发射区域的一部分被时间稳定的材料覆盖，而发射区域的大小发生变化，从而主要在直接幂律分量中产生通量变化。一旦发射区变得小于吸收体的尺寸，吸收的通量也开始减小。最后，当发射区充分减小时，直接和吸收成分都消失（即，“关断”状态）。在这种状态下，我们发现了热发射的特征，其温度为0.8 keV，与爆星活动的塞弗特2星系的统计分析得出的平均值一致。这可能表明NGC 4051拥有一个核爆炸区域。

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