Multiphase ISM in low luminosity radio galaxies: A case study of NGC 708

TL;DR

This study conducts a comprehensive multi-wavelength analysis of the elliptical galaxy NGC708, revealing complex multiphase interstellar medium components and X-ray cavities, enhancing understanding of galaxy environments.

Contribution

It provides the first detailed multi-wavelength mapping of multiphase ISM and X-ray cavities in NGC708, combining optical, X-ray, infrared, and radio data.

Findings

Cool gas, dust, warm ionized gas, and hot X-ray emitting gas are spatially associated.

Presence of X-ray cavities approximately 5.6 kpc from the galaxy center.

Multi-phase ISM components are interconnected in NGC708.

Abstract

We present a multi-wavelength study of a nearby radio loud elliptical galaxy NGC708, selected from the Bologna B2 sample of radio galaxies. We obtained optical broad band and narrow images from IGO 2m telescope (Pune, India). We supplement the multi-wavelength coverage of the observation by using X-ray data from Chandra, infrared data from 2MASS, Spitzer and WISE and optical image from DSS and HST. In order to investigate properties of interstellar medium, we have generated unsharp-masked, color, residual, quotient, dust extinction, H_alph emission maps. From the derived maps it is evident that cool gas, dust, warm ionized H_alpha and hot X-ray gas are spatially associated with each other. We investigate the inner and outer photometric and kinematic properties of the galaxy using surface brightness profiles. From X-ray 2d beta model, unsharp masking, surface brightness profiles techniques, it is evident that pair of X-ray cavities are present in this system and which are ~5.6 Kpc away from the central X-ray source.