论文标题
nustar非探测在具有KPC尺度快风的超湿的IR星系中微弱的活性银河核
NuSTAR Non-detection of a Faint Active Galactic Nucleus in an Ultraluminous IR Galaxy with Kpc-scale Fast Wind
论文作者
论文摘要
大规模流出通常被认为是活性银河核（AGN）可能严重影响其宿主星系的可能证据。最近发现，$ z = 0.49 $，Akari J0916248+073034的超浮标IR Galaxy（Ulirg）被发现具有Galaxy-Scale [OIII] $ 5007 $ 5007流出，最高能量投入率的最高能量投入率是$ z <1.6 $。然而，相对于发光[OIII]发射，根据其MID-IR（miR）辐射估算的中央AGN活性是弱的。在这项工作中，我们报告了该ULIRG的第一次Nustar硬X射线随访，以限制其当前的AGN光度。固有的2-10 KEV光度表明90％的上限为$ 3.0 \ times10^{43} $ erg s $^{ - 1} $，假设Compton-Thick-thick smecuration（$ n _ {\ rm H} = 1.5 \ times10^{24} $ cm $ cm $^{ - 2} $校正[OIII]光度。通过Nustar的观察，我们成功地确定了这种Ulirg在当地Ulirgs中最极端的X射线赤字案例。一种可能解释电晕（X射线）和圆环（MIR）急剧下降的情况是，由于其强大的核风风在银河量表中强大的电离流出表明，AGN积聚磁盘的主要辐射目前处于褪色状态。
Large-scale outflows are generally considered as a possible evidence that active galactic nuclei (AGNs) can severely affect their host galaxies. Recently an ultraluminous IR galaxy (ULIRG) at $z=0.49$, AKARI J0916248+073034, was found to have a galaxy-scale [OIII] $λ$5007 outflow with one of the highest energy-ejection rates at $z<1.6$. However, the central AGN activity estimated from its torus mid-IR (MIR) radiation is weak relative to the luminous [OIII] emission. In this work we report the first NuSTAR hard X-ray follow-up of this ULIRG to constrain its current AGN luminosity. The intrinsic 2-10 keV luminosity shows a 90% upper-limit of $3.0\times10^{43}$ erg s$^{-1}$ assuming Compton-thick obscuration ($N_{\rm H}=1.5\times10^{24}$ cm$^{-2}$), which is only 3.6% of the luminosity expected from the extinction corrected [OIII] luminosity. With the NuSTAR observation, we succeed to identify that this ULIRG has a most extreme case of X-ray deficit among local ULIRGs. A possible scenario to explain the drastic declining in both of the corona (X-ray) and torus (MIR) is that the primary radiation from the AGN accretion disk is currently in a fading status, as a consequence of a powerful nuclear wind suggested by its powerful ionized outflow in the galaxy scale.
