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VLBI observations of SN2011dh: imaging of the youngest radio supernova

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arxiv 1110.5311 v3 pith:VPXMAOQ7 submitted 2011-10-24 astro-ph.HE astro-ph.CO

VLBI observations of SN2011dh: imaging of the youngest radio supernova

classification astro-ph.HE astro-ph.CO
keywords supernovaobservationsvlbievladensityfluxsn2011dhyoungest
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We report on the VLBI detection of supernova SN2011dh at 22GHz using a subset of the EVN array. The observations took place 14 days after the discovery of the supernova, thus resulting in a VLBI image of the youngest radio-loud supernova ever. We provide revised coordinates for the supernova with milli-arcsecond precision, linked to the ICRF. The recovered flux density is a factor 2 below the EVLA flux density reported by other authors at the same frequency and epoch of our observations. This discrepancy could be due to extended emission detected with the EVLA or to calibration problems in the VLBI and/or EVLA observations.

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