Discovery of Optical Echoes from Supernova 1987A: New Probes of the Large Magellanic Cloud

摘要: Coronagraphic observations of SN 1987A have revealed the first light echo or transient reflection nebula due to from an SN. Two echoes dust 400 and 980 lt-yr in front were discovered on March 4.05, 1988 (UT). These phenomena can be exploited probe physics dust, structure interstellar medium, unobserved initial hours 1987A, relation between gasdynamics star formation active portion LMC. The results show that scatters consistent with Rayleigh's law, at least some is reflected N157C superbubble nebula, future reobservation time evolution UV pulse associated shock outbreak through progenitor star's surface may difficult reoslve. 16 references.