Evolution of the Unidentified Infrared Bands in the Nucleus of the Starburst Galaxy NGC 1097

TL;DR

This study analyzes the Unidentified Infrared Bands in NGC 1097 using combined spectral data from AKARI and Spitzer, revealing size variations of UIB carriers linked to radiation effects.

Contribution

It provides a comprehensive spectral analysis of UIBs in NGC 1097, demonstrating the impact of radiation on grain size distribution.

Findings

UIB carrier size is larger in the galaxy's center.

Small grains are destroyed by the central active nucleus.

Spectral data from 3 to 20 microns was used for analysis.

Abstract

We present the analysis of the Unidentified Infrared Bands (UIB) in the starburst galaxy NGC 1097. We have combined spectral maps observed with the AKARI/IRC and Spitzer/IRS instruments, in order to study all of the most prominent UIBs, from 3 to 20 micron. Such a complete spectral coverage is crucial to remove the common degeneracies between the effects of the variations of the size distribution and of the charge state of the grains. By studying several UIB ratios, we show evidence that the average size of the UIB carriers is larger in the central region than in the circumnuclear ring. We interpret this result as the selective destruction of the smallest grains by the hard radiation from the central active galactic nucleus.