# GASP XVIII: Star formation quenching due to AGN feedback in the central region of a jellyfish galaxy

## TL;DR

This study provides evidence that AGN feedback in the jellyfish galaxy JO201 suppresses star formation in its central region, demonstrating the combined impact of active galactic nuclei and ram pressure stripping on galaxy evolution.

## Contribution

It presents the first detailed case of AGN feedback causing star formation quenching in a jellyfish galaxy undergoing ram pressure stripping.

## Key findings

- Central star formation is suppressed within 8.6 kpc of JO201.
- Evidence of a cavity in molecular gas coincides with AGN activity.
- Star formation suppression occurred within the last 100 million years.

## Abstract

We report evidence for star formation quenching in the central 8.6 kpc region of the jellyfish galaxy JO201 which hosts an active galactic nucleus, while undergoing strong ram pressure stripping. The ultraviolet imaging data of the galaxy disk reveal a region with reduced flux around the center of the galaxy and a horse shoe shaped region with enhanced flux in the outer disk. The characterization of the ionization regions based on emission line diagnostic diagrams shows that the region of reduced flux seen in the ultraviolet is within the AGN-dominated area. The CO J$_{2-1}$ map of the galaxy disk reveals a cavity in the central region. The image of the galaxy disk at redder wavelengths (9050-9250 $\overset{\lower.5em\circ}{\mathrm{A}}$) reveals the presence of a stellar bar. The star formation rate map of the galaxy disk shows that the star formation suppression in the cavity occurred in the last few 10$^8$ yr. We present several lines of evidence supporting the scenario that suppression of star formation in the central region of the disk is most likely due to the feedback from the AGN. The observations reported here make JO201 a unique case of AGN feedback and environmental effects suppressing star formation in a spiral galaxy.