Superbubble blowout in the giant H II region NGC 2363?
J. R. Roy, G. Joncas, J. Boulesteix, B. Grundseth;
ApJ, 1991, 367, 141
ABSTRACT:The velocity field of the giant H II complex NGC 2363 in the SBm galaxy NGC 2366 has been mapped in the forbidden O III
5007 A line using a scanning Fabry-Perot interferometer.
The forbidden O
III line profiles correspond to symmetrical and single component
profiles in most of the nebulae of NGC 2366, except in the bright core of the giant H
II NGC 2363 where strong splitting of the line occurs.
This splitting is
consistent with a bubble 200 pc in diameter expanding with a velocity of 45
km/s.
The total kinetic energy of the bubble is 2 x 10 to the 52nd ergs; the
kinematic age of the bubble is less than or equal to two million yr.
The bubble
could be produced by the sole action of combined stellar winds from the
central clusters of OB stars.
A well-defined sector, 150 pc wide, of the H II
complex originating at the bubble shows systematic receding velocities; it is
suggested that this region acts as a vent through which gas escape into the halo of
the galaxy.
Large H-alpha shells are observed in the surroundings of NGC
2363.
There is also evidence for a very broad and low-entensity forbidden O III
high-velocity component associated with the bubble.
KEYWORDS: fabry-perot interferometers, h ii regions, plasma bubbles, star clusters, star formation, stellar winds, h alpha line, interstellar matter, kinetic energy, stellar mass
PERSOKEY:region hii, optical, ,
CODE: roy91