VLA H53alpha observations of the central region of the Super Star Cluster Galaxy NGC 5253

We present observations in the H53alpha line and radio continuum at 43 GHz carried out with the VLA in the D array (2'' angular resolution) toward the starburst galaxy NGC 5253. VLA archival data have been reprocessed to produce a uniform set of 2, 1.3 and

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aVLAH53αobservationsofthecentralregionoftheSuperStarClusterGalaxyNGC5253C.A.Rodr´ guez-Rico1,2carlos@astro.ugto.mxW.M.Goss3mgoss@nrao.eduJ.L.Turner4turner@astro.ucla.eduY.G´omez2y.gomez@astrosmo.unam.mxABSTRACTWepresentobservationsintheH53αlineandradiocontinuumat43GHzcarriedoutwiththeVLAintheDarray(2′′angularresolution)towardthestarburstgalaxyNGC5253.VLAarchivaldatahavebeenreprocessedtoproduceauniformsetof2,1.3and0.7cmhighangular(0.′′2×0.′′1)radiocontinuumimages.TheRRLH53α,apreviouslyreportedmeasurementoftheH92αRRL uxdensityandthereprocessedhighangularresolutionradiocontinuum uxdensitieshavebeenmodeledusingacollectionofHIIregions.Basedonthemodels,theionizedgasinthenuclearsourcehasanelectrondensityof～6×104cm 3andanvolume llingfactorof0.05.ALymancontinuumphoton

productionrateof2×1052s 1isnecessarytosustaintheionizationinthenuclearregion.ThenumberofrequiredO7starsinthecentral1.5pcofthesupernebulais～2000.TheH53αvelocitygradient(10kms 1arcsec 1)impliesadynamicalmassof～3×105M⊙;thismasssuggeststhesupernebulaiscon nedbygravity.

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