Self-Regulated Fueling of Galaxy Centers: Evidence for Star-Formation Feedback in IC342's Nucleus

TL;DR

This study uses high-resolution observations to show that star formation feedback in IC342's nucleus influences molecular gas flow, potentially regulating gas supply to the galaxy's center.

Contribution

It provides new observational evidence of star formation feedback affecting molecular gas dynamics in galaxy nuclei.

Findings

Star formation feedback compresses and pushes molecular gas outward.

Feedback likely reduces gas inflow to the central 10pc.

Repetitive star formation in nuclear clusters supports the feedback scenario.

Abstract

Using new, high-resolution interferometric observations of the CO and HCN molecules, we directly compare the molecular and ionized components of the interstellar medium in the center of the nearby spiral galaxy IC342, on spatial scales of ~ 10pc. The morphology of the tracers suggests that the molecular gas flow caused by a large-scale stellar bar has been strongly affected by the mechanical feedback from recent star formation activity within the central 100pc in the nucleus of the galaxy. Possibly, stellar winds and/or supernova shocks originating in the nuclear star cluster have compressed, and likely pushed outward, the infalling molecular gas, thus significantly reducing the gas supply to the central 10pc. Although our analysis currently lacks kinematic confirmation due to the face-on orientation of IC342, the described scenario is supported by the generally observed repetitive nature of star formation in the nuclear star clusters of late-type spiral galaxies.