30 Doradus as the active centre of the Large Magellanic Cloud

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Galactic Nuclei, Magellanic Clouds, Nebulae, Active Galactic Nuclei, Galactic Structure, H Ii Regions, Star Clusters, Stellar Luminosity, Stellar Mass Ejection, Supergiant Stars

Scientific paper

Evidence is presented for the hypothesis that the supergiant H II complex 30 Doradus (NGC 2070) is the mildly active galactic nucleus of the Large Magellanic Cloud. For this purpose the general properties of galactic nuclei and the characteristics of active nuclei are reviewed. Examination of 30 Doradus shows that it plays the same exceptional role among all H II regions of the LMC as Sgr A among those of our Galaxy, and has all the properties of a galactic nucleus (luminosity, emission spectrum, IR source, semistellar central object R 136, symmetry center and starting point of spiral structure). Evidence for the activity is given by the peculiar filamentary structure, the young spiral filaments superposed on old, broad and smooth near-circular arms, the splitting of the forbidden O III 5007 profile in two components corresponding to an expansion velocity of 50 km/sec, and the strong nonthermal component.

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