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arXiv 2403.09174astro-ph.GA
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SDSS-IV MaNGA 中一个衰退活动星系核的性质

Properties of a Fading AGN from SDSS-IV MaNGA

Hao Mo, Yan-Mei Chen, Zhi-Yun Zhang, Alexei Moiseev, Dmitry Bizyaev, Yong Shi, Qiu-Sheng Gu, Min Bao, Xiao Cao, Song-Lin Li

AI总结:

本研究利用 MaNGA 数据识别出衰退 AGN SDSS J220141.64+115124.3,通过线比、双高斯分解及运动学分析,结合并合遗迹证据,确认其中心活动减弱,并揭示多次爆发机制。

摘要:

我们从阿帕奇角点天文台近邻星系巡天(Mapping Nearby Galaxies at Apache Point Observatory,MaNGA)的内部产品发布 11(MPL-11)中识别出一个衰退的活动星系核(AGN)SDSS J220141.64+115124.3。其投影半径约 2.4 kpc 的中心区域表现为 LINER 型线比特征,而延伸至约 15 kpc 的外围区域则呈现 Seyfert 型线比。Seyfert 区域的 [OIII]λ5007 光度在不进行(进行)尘埃消光校正时比 LINER 区域高 37(2)倍,表明活动星系核活动至少在大约 8×10^3 年(约 2.4 kpc/光速)前开始减弱。我们用双高斯分量(一个窄核和一个宽翼)对中心区域的发射线光谱进行建模,并分析了每个分量的性质。窄核分量主要与恒星盘共转,而宽翼分量的速度弥散中值约为 300 km s^-1,与风状外流相关。电离气体的运动学位置角(PA)从星系中心到 1.5 倍有效半径发生了约 20° 的扭转。在 0.4 倍有效半径内,气体与恒星分量的 PA 差中值高达约 50°。DESI 图像中的潮汐特征以及恒星-气体错位表明该星系是一个并合残余。综合所有这些观测结果以及公开可用的 X 射线和中红外光度,我们确认这是一个衰退的活动星系核:并合过程启动了中心引擎进入类星体阶段,该阶段电离了由潮汐碎片组成的气体,而现在中心黑洞的活动正在减弱。[OIII]λ5007 通量和等效宽度(EQW)图中的不连续性是由于并合残余气体流入触发的多次活动星系核爆发所致。

英文摘要:

We identify a fading AGN SDSS J220141.64+115124.3 from the internal Product Launch-11 (MPL-11) in Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. The central region with a projected radius of $\sim$2.4 kpc is characterized as LINER-like line ratios while the outskirts extended to $\sim$15 kpc show Seyfert-like line ratios. The [OIII]$λ$5007 luminosity of the Seyfert regions is a factor of 37 (2) higher than the LINER regions without (with) dust attenuation correction, suggesting that the AGN activity decreases at least $\sim$8 $\times$ 10$^3$ yrs ($\sim$2.4 kpc/light-speed) ago. We model the emission line spectra in the central region with double Gaussian components (a narrow core and a broad wing) and analyze the properties of each component. The narrow core component mostly co-rotates with the stellar disc, whereas the broad wing component with a median of the velocity dispersion $\sim$300 km s$^{-1}$ is related to a wind outflow. The kinematic position angle (PA) of the ionized gas shows a $\sim$20° twist from the galaxy center to 1.5 effective radius. The median of the PA difference between the gas and stellar components is as large as $\sim$50° within 0.4 effective radius. The tidal feature in DESI image and star-gas misalignment suggest this galaxy is a merger remnant. Combining all these observational results as well as public available X-ray and MIR luminosities, we confirm this is a fading AGN, the merger process kick-started the central engine to quasar phase which ionized gas composed of tidal debris, and now the activity of the central black hole decreases. The discontinuity in [OIII]$λ$5007 flux and EQW maps is due to multiple AGN outbursts triggered by merger remnant gas inflows.

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