Abstract
We present high-resolution e-MERLIN radio continuum maps of the Dwarf Irregular galaxy IC10 at 1.5GHz and 5GHz. We detect 11 compact sources at 1.5GHz, 5 of which have complementary detections at 5GHz. We classify 3 extended sources as compact H{\sc ii} regions within IC10, 5 sources as contaminating background galaxies and identify 3 sources which require additional observations to classify. We do not expect that any of these 3 sources are Supernova Remnants as they will likely be resolved out at the assumed distance of IC10 (0.7Mpc). We correct integrated flux densities of IC10 from the literature for contamination by unrelated background sources and obtain updated flux density measurements of $354\pm11$\,mJy at 1.5GHz and $199\pm9$\,mJy at 4.85GHz. The background contamination does not contribute significantly to the overall radio emission from IC10, so previous analysis concerning its integrated radio properties remain valid.
Highlights
Radio emission within normal galaxies originates from the evolution and death of massive stars (≥ 8 M ) and effectively traces recent star formation (SF; Condon 1992)
Surrounding plots: Naturally weighted 1.5 GHz e–MERLIN detections from this study
We present high-resolution e–MERLIN observations of the nearby Dwarf Irregular galaxy IC 10 as a part of the LeMMINGs project
Summary
Radio emission within normal galaxies originates from the evolution and death of massive stars (≥ 8 M ) and effectively traces recent star formation (SF; Condon 1992). At the time of writing, radio luminosity is calibrated as a SFR indicator via the radio–FIR relation (Bell 2003), a tight correlation which links both FIR and radio emission to massive SF. The physical origin of this correlation is not fully understood, with many seemingly independent factors balancing out to form a ‘cosmic conspiracy’ (Condon 1992; Appleton et al 2004; Lacki et al 2010). This makes it desirable to calibrate the radio–SF relation without recourse to the FIR data.
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