Bibcode
Fuentes-Masip, O.; Castaneda, H. O.; Munoz-Tunon, C.; Vilchez, J. M.; Copetti, M. V. F.
Bibliographical reference
American Astronomical Society, 180th AAS Meeting, #24.17; Bulletin of the American Astronomical Society, Vol. 24, p.764
Advertised on:
5
1992
Citations
0
Refereed citations
0
Description
We have used the TAURUS Fabry-Perot imaging spectrograph at the William
Hershell Telescope of the Observatorio del Roque de los Muchachos to
study the kinematics of the HII regions in the central zone of the
irregular galaxy NGC 4449. Velocity maps have been obtained in the lines
of Hα and [OIII]lambda 5007. Those maps allow us to study the
gradient of velocity along the axis of the galaxy, and between the inner
and outer regions, as well as the kinematics of the diffuse ionized gas.
For each HII region the two observed emission lines were fit with a
gaussian profile, and we determined the peak intensity, radial velocity
and the line width. We have combined this data with narrow-band images
of the galaxy in order to gain insight into the effect of the massive
stellar population on the energetics of the ionized gas.