Local Group dSph radio survey with ATCA (I): Observations and background sources
M. Regis, L. Richter, S. Colafrancesco, M. Massardi, W.J.G. de Blok,, S. Profumo, and N. Orford

TL;DR
This paper presents deep radio observations of six local dwarf spheroidal galaxies using ATCA, cataloging background sources and analyzing their properties to understand the diffuse emission and background radio source population.
Contribution
It provides the first deep radio survey of these dSphs, creating a catalog of sources and comparing their properties with existing radio surveys, advancing knowledge of their diffuse emission and background sources.
Findings
Cataloged 1392 radio sources in six dSph fields.
Background source population dominated by synchrotron emitters.
Radio source counts agree with AGN models down to 0.25 mJy.
Abstract
Dwarf spheroidal (dSph) galaxies are key objects in near-field cosmology, especially in connection to the study of galaxy formation and evolution at small scales. In addition, dSphs are optimal targets to investigate the nature of dark matter. However, while we begin to have deep optical photometric observations of the stellar population in these objects, little is known so far about their diffuse emission at any observing frequency, and hence on thermal and non-thermal plasma possibly residing within dSphs. In this paper, we present deep radio observations of six local dSphs performed with the Australia Telescope Compact Array at 16 cm wavelength. We mosaiced a region of radius of about one degree around three "classical" dSphs, Carina, Fornax, and Sculptor, and of about half of degree around three "ultra-faint" dSphs, BootesII, Segue2, and Hercules. The rms noise level is below 0.05…
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