Signs of active galactic nucleus quenching in a merger remnant with radio jets
Signs of active galactic nucleus quenching in a merger remnant with radio jets
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DOI：
10.1093/pasj/psv112
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发表时间：
2015-10
影响因子：
2.3
通讯作者：
K. Ichikawa;J. Ueda;M. Shidatsu;T. Kawamuro;K. Matsuoka
中科院分区：
文献类型：
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作者：
K. Ichikawa;J. Ueda;M. Shidatsu;T. Kawamuro;K. Matsuoka
我们研究了合并遗迹 Arp 187 中的光学、红外和放射性活跃星系核 (AGN) 迹象，该星系拥有大约 10^5$ 年前发射的发光喷流，但其目前的 AGN 活动仍然未知。我们从光学 BPT 图和红外 [OIV]25.89 $\mu$m 线中发现 AGN 迹象，源自 AGN 的窄线区域。另一方面，斯皮策/IRS 显示了主星系主导的光谱，表明活动星系核环面的热发射相当小或已经减弱。结合黑洞质量、核心射电光度上限和黑洞基本平面，我们能够估计 X 射线光度，从而得出 $<10^{40}$ erg s$^{-1}$。这些结果表明，Arp 187 的活动星系核活动已经被淬灭，但由于过去活动星系核活动的发射时间延迟，窄线区域仍然存在。
We investigate optical, infrared, and radio active galactic nucleus (AGN) signs in the merger remnant Arp 187, which hosts luminous jets launched in the order of $10^5$ yr ago but whose present-day AGN activity is still unknown. We find AGN signs from the optical BPT diagram and infrared [OIV]25.89 $\mu$m line, originating from the narrow line regions of AGN. On the other hand, Spitzer/IRS show the host galaxy dominated spectra, suggesting that the thermal emission from the AGN torus is considerably small or already diminished. Combining the black hole mass, the upper limit of radio luminosity of the core, and the fundamental plane of the black hole enable us to estimate X-ray luminosity, which gives $<10^{40}$ erg s$^{-1}$. Those results suggest that the AGN activity of Arp 187 has already been quenched, but the narrow line region is still alive owing to the time delay of emission from the past AGN activity.