Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91.1295m&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, June 1986, p. 1295-1300. Research supported by Rutgers University.
Astronomy and Astrophysics
Astronomy
10
Astronomical Spectroscopy, Emission Spectra, Gas Dynamics, H Alpha Line, Hydrogen Ions, Irregular Galaxies, Fabry-Perot Interferometers, H Ii Regions, Kinematics, Milky Way Galaxy, Normal Density Functions, Velocity Distribution
Scientific paper
A Fabry-Perot imaging interferometer has been used to determine the velocity and velocity-dispersion fields of the ionized gas in the LMC-type irregular galaxy NGC 4449. In addition to the previously known H II regions and filaments, an extensive system of diffuse, low-intensity H-alpha emission is found throughout the galaxy. The velocities of the bright H II regions in the barlike region of the galaxy are in good agreeemnt with published velocities. The diffuse gas in the bar as well as the H II regions indicate a rotation of about + or - 15 km/s. The regions of highest and lowest velocities are in the diffuse gas off of the bar. In at least two places these regions end just at the edge of the bar. The velocities and velocity dispersions are in qualitative agreement with a spherical patchy inflow of gas from a large H I cloud that surrounds the galaxy.
Malumuth Eliot M.
Schommer Robert A.
Williams Ted B.
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