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High velocity motions inside the HII region N 103 of the Large Magellanic Cloud *
P. Ambrocio-Cruz 1, 2,
A. Laval 1,
M. Marcelin 1 and
P. Amram 1
Received 6 June 1996 / Accepted 12 September 1996
We have observed the HII region N 103 of the Large Magellanic Cloud with a scanning Fabry-Perot interferometer at H and [OIII]5007 wavelengths. The kinematics of this field shows high velocity motions. We discuss their origin: Supernova explosion or particularly strong stellar winds.
By calculating the energy input inside the gas, we show that it is unlikely that the high velocity motions are due to the stellar winds of the embbeded stars. Then the nebula N 103 is linked to two supernova remnants of different ages. The oldest one can be represented by a bubble, 152 pc wide, seen projected against the HII region, and probably lying at the edge of the HII region. The exciting stars of the nebula are actually members of the LMC cluster NGC 1850B; they provide a photon flux large enough to ionize the quiet part of the gas.
Key words: ISM: bubbles ISM: HII regions ISM: individual objects: N 103 ISM: kinematics and dynamics ISM: supernova remnants galaxies: Magellanic Clouds
Present address: Observatoire de Marseille, 2, Place Leverrier, 13248 Marseille Cedex 4, France
Send offprint requests to: P. Ambrocio-Cruz
Online publication: July 3, 1998