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Infrared integral field spectroscopy of SN 1987A
Context: SN 1987A in the Large Magellanic Cloud is close enough for astudy of the very late time evolution of a supernova and its transitionto a supernova remnant. Nearly two decades after explosion we arewitnessing the supernova shock wave engaging the inner circumstellarring, which had been fluorescing since being ionised by the soft X-rayflash from shock breakout. Aims: We follow the interaction of thesupernova shock with the ring material. The spatially resolvedinformation provides us with insight into the individual shock regionsaround the ring. Methods: Near-infrared integral fieldspectroscopy observations with SINFONI/VLT of the SN-ring interaction ispresented. SINFONI's adaptive optics supported integral fieldspectrograph spatially resolves the ring and the data thus we obtain abetter spatial understanding of the spectrum in different regions of theobject. Results: With a dynamical map of the interacting ring wedetermine parameters for its geometry. Since most of the IR emissionlines originate behind the shock front we obtain an indication of theradial velocity of the shocked material after deconvolving the geometry.The ring geometry is consistent with a circle and we also derive a new,independent measurement of the systemic ring, and presumably alsosupernova, velocity. We find from the spatial distributions of the fluxin the different emission lines the degree of cooling in the shockedmaterial and follows the increases observed in the radio and X-rays.Emission from the ejecta is detected only in the strongest [Fe II]lines.Based on observations collected at the European Southern Observatory,Chile. Tables 3 and 4 are only available in electronic form athttp://www.aanda.org
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