NuSTAR Non-detection of a Faint Active Galactic Nucleus in an Ultraluminous Infrared Galaxy with Kpc-scale Fast Wind
NuSTAR Non-detection of a Faint Active Galactic Nucleus in an Ultraluminous Infrared Galaxy with Kpc-scale Fast Wind
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DOI：
10.3847/2041-8213/abca30
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
Xiaoyang Chen;K. Ichikawa;H. Noda;T. Kawamuro;T. Kawaguchi;Y. Toba;M. Akiyama
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文献类型：
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作者：
Xiaoyang Chen;K. Ichikawa;H. Noda;T. Kawamuro;T. Kawaguchi;Y. Toba;M. Akiyama
大规模外流通常被认为是活动星系核（AGN）可能严重影响其宿主星系的可能证据。最近，一个z = 0.49的超亮红外星系（ULIRG），AKARI J 0916248 +073034，被发现有一个星系尺度的[O iii] λ5007外流，在z < 1.6时具有最高的能量喷射率之一。然而，根据活动星系核环的中红外（MIR）辐射估算的活动星系核活动相对于[O iii]发光辐射来说是很弱的。在这项工作中，我们报告的第一个努斯塔硬X射线的后续行动，这ULIRG限制其目前的活动星系核光度。2-10 keV内禀光度显示90%的上限为3.0 × 1043 erg s−1，假设康普顿厚度的遮蔽（NH = 1.5 × 1024 cm−2），这仅是从修正的[O iii]光度预期的3.6%。使用努斯塔观测，我们成功地确定，这个ULIRG有一个非常极端的情况下，当地ULIRG的X射线赤字。解释日冕（X射线）和环面（MIR）急剧下降的一种可能的情况是，来自活动星系核吸积盘的初级辐射目前处于衰落状态，这是星系尺度上强大的电离外流所产生的强大核风的结果。
Large-scale outflows are generally considered to be possible evidence that active galactic nuclei (AGNs) can severely affect their host galaxies. Recently, an ultraluminous infrared galaxy (ULIRG) at z = 0.49, AKARI J0916248+073034, was found to have a galaxy-scale [O iii] λ5007 outflow with one of the highest energy-ejection rates at z < 1.6. However, the central AGN activity estimated from its torus mid-infrared (MIR) radiation is weak relative to the luminous [O iii] 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 × 1043 erg s−1 assuming Compton-thick obscuration (NH = 1.5 × 1024 cm−2), which is only 3.6% of the luminosity expected from the extinction-corrected [O iii] luminosity. Using the NuSTAR observation, we successfully identify that this ULIRG has a very extreme case of X-ray deficit among local ULIRGs. A possible scenario to explain the drastic decline in both 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 powerful ionized outflow in a galaxy scale.