Amusing观察周期性核瞬变ASASSN-14 ko的宿主揭示了第二个AGN
An Amusing Look at the Host of the Periodic Nuclear Transient ASASSN-14ko Reveals a Second AGN
摘要：
我们介绍了ESO 253 $-$ G 003的多单元光谱探测器（MUSE）积分场光谱学，它拥有一个已知的活动星系核（AGN）和周期性的核瞬态ASASSN-14 ko，作为全天候MUSE超新星附近星系积分场（AMUSING）调查的一部分。MUSE的观测结果表明，内区存在两个由$1.4\pm0.1~\rm{kpc}$（$\approx 1.\!\!^{\prime\prime}7$）分隔的活动星系核。较亮的原子核具有不对称的宽发射线轮廓，与活动星系核的档案名称有关。较暗的核没有宽的发射线成分，但显示出活动星系核的其他特征，包括$v_{\rm{FWHM}}\approx 700~\rm{km}~\rm{s}^{-1}$禁戒线发射、$\log_{10}(\rm{[OIII]}/\rm{H}β) \approx 1.1$和高激发电位发射线，如[Fe $~$ VII] $~\lambda6086$和He $~$ II $~\lambda4686$。宿主星系表现出大千磅级潮汐特征，从两个核的潜在流出，和一个可能的超级气泡的扰动形态。圆相对论盘模型不能再现较亮核中的非对称宽发射线轮廓，但两种非轴对称盘模型提供了对宽发射线轮廓的良好拟合：椭圆盘模型和圆盘+螺旋臂模型。定期核瞬态ASASSN-14 KO的影响进行了讨论。
英文摘要：
We present Multi-Unit Spectroscopic Explorer (MUSE) integral-field spectroscopy of ESO 253$-$G003, which hosts a known Active Galactic Nucleus (AGN) and the periodic nuclear transient ASASSN-14ko, observed as part of the All-weather MUse Supernova Integral-field of Nearby Galaxies (AMUSING) survey. The MUSE observations reveal that the inner region hosts two AGN separated by $1.4\pm0.1~\rm{kpc}$ ($\approx 1.\!\!^{\prime\prime}7$). The brighter nucleus has asymmetric broad, permitted emission-line profiles and is associated with the archival AGN designation. The fainter nucleus does not have a broad emission-line component but exhibits other AGN characteristics, including $v_{\rm{FWHM}}\approx 700~\rm{km}~\rm{s}^{-1}$ forbidden line emission, $\log_{10}(\rm{[OIII]}/\rm{H}β) \approx 1.1$, and high excitation potential emission lines such as [Fe$~$VII]$~\lambda6086$ and He$~$II$~\lambda4686$. The host galaxy exhibits a disturbed morphology with large kpc-scale tidal features, potential outflows from both nuclei, and a likely superbubble. A circular relativistic disk model cannot reproduce the asymmetric broad emission-line profiles in the brighter nucleus, but two non-axisymmetric disk models provide good fits to the broad emission-line profiles: an elliptical disk model and a circular disk + spiral arm model. Implications for the periodic nuclear transient ASASSN-14ko are discussed.
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