IC 2497 - Hanny Voorwerp系统中的扩展X射线发射：在衰减AGN周围气体中的能量注入
Extended X-ray emission in the IC 2497 - Hanny's Voorwerp system: energy injection in the gas around a fading AGN
摘要：
我们提出了深钱德拉X射线观测的核心IC 2497，星系与汉尼的Voorwerp和托管衰落AGN。我们发现扩展的软X射线发射从热气体周围的低本征光度（未遮蔽）活动星系核（$L_{\rm bol} \sim 10^{42}-10^{44}$ erg s $^{-1}$）。热气体中的温度结构表明在衰落的活动星系核周围存在气泡或空腔（$\mbox{E$ _{ \rm bub} $} \sim 10^{54} - 10^{55}$ erg）。一种可能的情况是，这个泡沫膨胀的衰落AGN，改变吸积状态后，现在在一个动力学模式。其他的可能性是，气泡已经被过去的发光类星体（$L_{\rm bol} \sim 10^{46}$ erg s $^{-1}$）膨胀了，或者温度梯度是活动星系核驱动的超级风的激波前沿的指示。我们讨论了可能的方案和活动星系核宿主星系的相互作用的影响，以及活动星系核和X射线双星生命周期之间的类比。我们的结论是，活动星系核可以注入机械能到宿主星系在其生命周期的结束，从而提供了一个源的机械反馈，以类似的方式观察到的X射线双星。
英文摘要：
We present deep Chandra X-ray observations of the core of IC 2497, the galaxy associated with Hanny's Voorwerp and hosting a fading AGN. We find extended soft X-ray emission from hot gas around the low intrinsic luminosity (unobscured) AGN ($L_{\rm bol} \sim 10^{42}-10^{44}$ erg s$^{-1}$). The temperature structure in the hot gas suggests the presence of a bubble or cavity around the fading AGN ($\mbox{E$_{\rm bub}$} \sim 10^{54} - 10^{55}$ erg). A possible scenario is that this bubble is inflated by the fading AGN, which after changing accretion state is now in a kinetic mode. Other possibilities are that the bubble has been inflated by the past luminous quasar ($L_{\rm bol} \sim 10^{46}$ erg s$^{-1}$), or that the temperature gradient is an indication of a shock front from a superwind driven by the AGN. We discuss the possible scenarios and the implications for the AGN-host galaxy interaction, as well as an analogy between AGN and X-ray binaries lifecycles. We conclude that the AGN could inject mechanical energy into the host galaxy at the end of its lifecycle, and thus provide a source for mechanical feedback, in a similar way as observed for X-ray binaries.
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