DUST PRODUCTION AND PARTICLE ACCELERATION IN SUPERNOVA 1987A REVEALED WITH ALMA
2014 (English)In: The Astrophysical Journal Letters, ISSN 2041-8205, Vol. 782, no 1, L2- p.Article in journal (Refereed) Published
Supernova (SN) explosions are crucial engines driving the evolution of galaxies by shock heating gas, increasing the metallicity, creating dust, and accelerating energetic particles. In 2012 we used the Atacama Large Millimeter/Submillimeter Array to observe SN 1987A, one of the best-observed supernovae since the invention of the telescope. We present spatially resolved images at 450 mu m, 870 mu m, 1.4 mm, and 2.8 mm, an important transition wavelength range. Longer wavelength emission is dominated by synchrotron radiation from shock-accelerated particles, shorter wavelengths by emission from the largest mass of dust measured in a supernova remnant (>0.2 M-circle dot). For the first time we show unambiguously that this dust has formed in the inner ejecta (the cold remnants of the exploded star's core). The dust emission is concentrated at the center of the remnant, so the dust has not yet been affected by the shocks. If a significant fraction survives, and if SN 1987A is typical, supernovae are important cosmological dust producers.
Place, publisher, year, edition, pages
Institute of Physics (IOP), 2014. Vol. 782, no 1, L2- p.
galaxies: ISM, ISM: supernova remnants, Magellanic Clouds, supernovae: individual (1987A)
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-101737DOI: 10.1088/2041-8205/782/1/L2ISI: 000331149900002OAI: oai:DiVA.org:su-101737DiVA: diva2:705695
NASA: NAG5-12595, NASA/ADAP NNX13AE36G 2014-03-172014-03-142014-03-17Bibliographically approved