Investigating the Evolution of the Dual AGN System ESO 509-IG066
Investigating the Evolution of the Dual AGN System ESO 509-IG066
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DOI：
10.3847/1538-4357/aa932e
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发表时间：
2017-10
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通讯作者：
P. Kosec;M. Brightman;D. Stern;F. Müller-Sánchez;M. Koss;K. Oh;R. Assef;P. Gandhi;F. Harrison;H. Jun;A. Masini;A. Masini;C. Ricci;C. Ricci;C. Ricci;D. Walton;E. Treister;J. Comerford;G. Privon
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作者：
P. Kosec;M. Brightman;D. Stern;F. Müller-Sánchez;M. Koss;K. Oh;R. Assef;P. Gandhi;F. Harrison;H. Jun;A. Masini;A. Masini;C. Ricci;C. Ricci;C. Ricci;D. Walton;E. Treister;J. Comerford;G. Privon
我们分析了位于z = 0.034的星系对ESO 509-IG 066中的双活动星系核（AGN）的演化。先前XMM-牛顿在这个双重活动星系核上的观测发现了两个中等遮蔽（<$1022 cm−2）的X射线发光（<$1043 erg s−1）核源的证据。我们提出了一个后续的钱德拉，努斯塔，和斯威夫特/XRT观测的分析表明，一个源的流量下降了10倍之间的2004年和2011年，这可以解释为增加吸收柱或内在的中央引擎的衰落，可能是由于质量吸积减少。这两种情况都是通过星系合并模拟预测的。通量下降的源不会被努斯塔探测到，它反对吸收，除非它是极端的。然而，新的Keck/LRIS光谱揭示了一个以前未报道的宽Hα线，在极端吸收情况下极不可能可见。因此，我们得出结论，这个核中的黑洞的吸积率已经急剧下降。从AO辅助的近红外积分场光谱的其他核，我们发现的证据表明，星系合并有一个直接影响的运动学的气体接近星系的核，提供了一个直接的观测星系合并和质量吸积率到黑洞之间的联系。
We analyze the evolution of the dual active galactic nucleus (AGN) in ESO 509-IG066, a galaxy pair located at z = 0.034 whose nuclei are separated by 11 kpc. Previous observations with XMM-Newton on this dual AGN found evidence for two moderately obscured ( ∼ 1022 cm−2) X-ray luminous ( ∼ 1043 erg s−1) nuclear sources. We present an analysis of subsequent Chandra, NuSTAR, and Swift/XRT observations that show one source has dropped in flux by a factor of 10 between 2004 and 2011, which could be explained by either an increase in the absorbing column or an intrinsic fading of the central engine, possibly due to a decrease in mass accretion. Both of these scenarios are predicted by galaxy merger simulations. The source that has dropped in flux is not detected by NuSTAR, which argues against absorption, unless it is extreme. However, new Keck/LRIS optical spectroscopy reveals a previously unreported broad Hα line that is highly unlikely to be visible under the extreme absorption scenario. We therefore conclude that the black hole in this nucleus has undergone a dramatic drop in its accretion rate. From AO-assisted near-infrared integral-field spectroscopy of the other nucleus, we find evidence that the galaxy merger is having a direct effect on the kinematics of the gas close to the nucleus of the galaxy, providing a direct observational link between the galaxy merger and the mass accretion rate onto the black hole.