Host Galaxy Properties of Changing-look AGN Revealed in the MaNGA Survey

Abstract

Changing-look Active Galactic Nuclei (CL-AGNs) are a subset of AGNs in which the broad Balmer emission lines appear or disappear within a few years. We use the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey to identify five CL-AGNs. The 2-D photometric and kinematic maps reveal common features as well as some unusual properties of CL-AGN hosts as compared to the AGN hosts in general. All MaNGA CL-AGNs reside in the star-forming main sequence, similar to MaNGA non-changing-look AGNs (NCL-AGNs). The $80\%\pm 16\%$ of our CL-AGNs do possess pseudo-bulge features, and follow the overall NCL-AGNs $M_{BH}-{\sigma }_{\ast }$ relationship. The kinematic measurements indicate that they have similar distributions in the plane of angular momentum versus galaxy ellipticity. MaNGA CL-AGNs however show a higher, but not statistically significant ($20\%\pm 16\%$) fraction of counter-rotating features compared to that ($1.84\%\pm 0.61\%$) in general star-formation population. In addition, MaNGA CL-AGNs favor more face-on (axis ratio $>$ 0.7) than that of Type I NCL-AGNs. These results suggest that host galaxies could play a role in the CL-AGN phenomenon.

11 pages, 4 tables, 4 figures. Accepted for publication in MNRAS

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• WISE view of changing-look AGNs: evidence for a transitional stage of AGNs
• A Systematic Analysis of Stellar Populations in the Host Galaxies of Changing-look AGNs
• Local Active Galactic Nuclei with Large Broad-Hα Variability Reside in Red Galaxies
• Modeling Star Formation Histories of Changing-Look AGN Host Galaxies with Prospector
• Identifying Changing-Look AGN Transitions in Light Curve Data with the Zwicky Transient Facility