Radial stellar populations of AGN-host dwarf galaxies in SDSS-IV MaNGA survey
Wei Cai, Yinghe Zhao, Jin-Ming Bai

TL;DR
This study investigates the spatially resolved stellar populations of dwarf galaxies hosting low-level AGNs using MaNGA IFU data, revealing that these galaxies are generally older and have flat metallicity gradients, with AGNs potentially influencing galaxy evolution.
Contribution
First detailed spatial analysis of stellar populations in AGN-host dwarf galaxies, showing their age and metallicity profiles and comparing them with non-AGN controls.
Findings
AGN-host dwarfs have older stellar populations than controls.
Stellar age and metallicity gradients are generally flat.
AGN activity may accelerate galaxy evolution and quenching.
Abstract
Based on MaNGA integral field unit (IFU) spectroscopy we search 60 AGN candidates, which have stellar masses and show AGN ionization signatures in the BPT diagram. For these AGN candidates, we derive the spatially resolved stellar population with the stellar population synthesis code STARLIGHT and measure the gradients of the mean stellar age and metallicity. We find that the gradients of mean stellar age (metallicity) of individual AGN-host dwarfs are diverse in 0-0.5 Re, 0.5-1 Re and 0-1 Re. However, the overall behavior of the mean stellar age (metallicity) profiles tend to be flat, as the median values of the gradients are close to zero. We further study the overall behavior of the mean stellar age (metallicity) by plotting the co-added radial profiles for the AGN sample and compare with a control sample with similar stellar mass. We find…
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