Radio-Continuum Study of the Nearby Sculptor Group Galaxies. Part 3: NGC 7793 at lambda=12.2, 6 and 3 cm

TL;DR

This study provides a detailed, high-resolution radio-continuum analysis of NGC 7793, identifying numerous sources and examining the micro-quasar's radio properties, enhancing understanding of nearby galaxy radio emissions.

Contribution

The paper offers new high-sensitivity, high-resolution radio images of NGC 7793, identifying 76 sources and analyzing the micro-quasar's spectral index, advancing radio observations of Sculptor group galaxies.

Findings

76 discrete radio sources identified, 57 classified

Micro-quasar NGC7793-S26 shows steep spectral index regions

High-resolution images improve understanding of galaxy radio emissions

Abstract

We re-examine a series of archived centimetre radio-continuum observations (lambda=16, 6 and 3 cm) focusing on NGC7793 using the Australia Telescope Compact Array. These new images are both very sensitive (rms=0.011 mJy/beam) and feature reasonably high angular resolution (down to < 3"). Using these images, a total of 76 discrete radio sources are identified, of which 57 have been classified. We also studied the radio component of the micro-quasar NGC7793-S26 which shows two distinct regions of somewhat steep spectral index between -0.3 and -0.7.