N49

N49 , abbreviation of LHA 120-N 49 , is a Rémanent of supernova located in the Galaxie of the Grand Cloud of Magellan. It is suspected of sheltering in its center the Sursauteur soft gamma SGR 0526-66, first object of this type to have been discovered.

Discovered

N49 was catalogued in 1956 by Karl G. Henize as being a Nébuleuse presenting an emission H-alpha. It is in 1973 that it was identifé as being remanent of supernova. It is following the observation of a puff of gamma rays in 1979 that could be announced the fact that this remanent was the host of the sursautor soft gamma SGR 0526-66, whose position was considered by the precise measurement of times of arrival of the puff of gamma rays measured by several artificial satellite provided with detectors of gamma rays then in service (in particular Pioneer-Venus Observatory, International Sun-Earth Explorer 3, Helios B, as Venera 11, Venera 12 and Prognoz 7).

Characteristics physics

This remanent is also detected in the field of the Ondes radio. Its spectral Indice is of -0.49, typical of an object of this type. Its Brillance of surface is raised, with 96,3× 10 -19 W · m -2 · Hz -1 · Sr -1 , which makes of it remanent more the brilliance of the Large Cloud in the visible Domaine. The physical distance to the Large Cloud of Magellan being known, the angular size of remanent gives its physical size immediately, from approximately 6 Parsec S, the remanent one being of rather irregular form (evoking contours of the South America).

See too

External bonds

N49 seen by the Space telescope Hubble

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