Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...272..541r&link_type=abstract
Astronomy and Astrophysics, Vol.272, NO. 2/MAYII, P. 541, 1993
Astronomy and Astrophysics
Astrophysics
11
Scientific paper
The detailed radial velocity field of the SNR N 120, in the LMC, has been obtained for the Hα line with a spatial resolution of 2.6" over a 3' x 3' field. The profiles of the radial velocities present complex splittings and simultaneously large broadenings. The gaseous components identified along the line of sight, belong to the nebular complex N 120 and to the SNR. They are carefully separated, and thus the true Hα morphology of the SNR is obtained. The peculiar velocity field of the SNR indicates an interaction with the neighbouring nebula, and departures from spherical geometry which can be due to small scale inhomogeneities of the interstellar medium where the supernova exploded. The expansion velocity of the clumps is 100 km s^-1^ and the preshock density evaluated for the clumps is 10atcm^-3^. The large broadenings of the split velocity components of the SNR can reach 90 km s^-1^, revealing high internal motions. They indicate the presence of secondary shocks induced inside the clumps by a fast blast wave probably responsible also for the X-ray emission. The broadenings and the radial velocities appear to present some correlation suggesting that the shocks induced inside the cloudlets have a direction related to the direction of the blast wave velocity.
Boulesteix Jacques
Georgelin Y. P.
Laval A.
Le Coarer Etienne
Marcelin Michel
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