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 $${\rm{[O {\small III}]}}$$$$\lambda$$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$^3$ yr ($$\sim$$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 analyse 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 an $$\sim 20^{\circ }$$ twist from the galaxy centre to 1.5 effective radius. The median of the PA difference between the gas and stellar components is as large as $$\sim 50^{\circ }$$ 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 $${\rm{[O {\small III}]}}$$$$\lambda$$5007 flux and EQW maps is due to multiple AGN outbursts triggered by merger remnant gas inflows.
Mo, Hao, et al. "Properties of a fading AGN from SDSS-IV MaNGA." Monthly Notices of the Royal Astronomical Society, vol. 529, no. 4, Mar. 2024. https://doi.org/10.1093/mnras/stae753
Mo, Hao, Chen, Yan-Mei, Zhang, Zhi-Yun, et al., "Properties of a fading AGN from SDSS-IV MaNGA," Monthly Notices of the Royal Astronomical Society 529, no. 4 (2024), https://doi.org/10.1093/mnras/stae753
@article{osti_2333065,
author = {Mo, Hao and Chen, Yan-Mei and Zhang, Zhi-Yun and Moiseev, Alexei and Bizyaev, Dmitry and Shi, Yong and Gu, Qiu-Sheng and Bao, Min and Cao, Xiao and Li, Song-Lin},
title = {Properties of a fading AGN from SDSS-IV MaNGA},
annote = {ABSTRACT 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 ${\rm{[O {\small III}]}}$$\lambda$5007 luminosity of the Seyfert regions is a factor of 37 (2) higher than the LINER regions without (with) dust attenuation correction, suggesting that the AGN activity decreases at least $\sim$8 $\times$ 10$^3$ yr ($\sim$2.4 kpc/light-speed) ago. We model the emission line spectra in the central region with double Gaussian components (a narrow core and a broad wing) and analyse the properties of each component. The narrow core component mostly co-rotates with the stellar disc, whereas the broad wing component with a median of the velocity dispersion $\sim$300 km s$^{-1}$ is related to a wind outflow. The kinematic position angle (PA) of the ionized gas shows an $\sim 20^{\circ }$ twist from the galaxy centre to 1.5 effective radius. The median of the PA difference between the gas and stellar components is as large as $\sim 50^{\circ }$ within 0.4 effective radius. The tidal feature in DESI image and star–gas misalignment suggest this galaxy is a merger remnant. Combining all these observational results as well as public available X-ray and MIR luminosities, we confirm this is a fading AGN, the merger process kick-started the central engine to quasar phase which ionized gas composed of tidal debris, and now the activity of the central black hole decreases. The discontinuity in ${\rm{[O {\small III}]}}$$\lambda$5007 flux and EQW maps is due to multiple AGN outbursts triggered by merger remnant gas inflows.},
doi = {10.1093/mnras/stae753},
url = {https://www.osti.gov/biblio/2333065},
journal = {Monthly Notices of the Royal Astronomical Society},
issn = {ISSN 0035-8711},
number = {4},
volume = {529},
place = {United Kingdom},
publisher = {Oxford University Press},
year = {2024},
month = {03}}
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 529; ISSN 0035-8711