A kinematical study of the Giant H II Regions in NGC 4449

Details A kinematical study of the Giant H II Regions in NGC 4449 A kinematical study of the Giant H II Regions in NGC 4449

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001rmxac..10...34f&link_type=abstract

The Seventh Texas-Mexico Conference on Astrophysics: Flows, Blows and Glows (Eds. William H. Lee and Silvia Torres-Peimbert) Rev

Astronomy and Astrophysics

Astrophysics

Galaxies: Irregulars, Hydrodynamics, Ism: \Ion{H}{2} Regions, Ism: Kinematics And Dynamics

Scientific paper

We present the results of a kinematical study of the H II regions in the central area of the giant irregular galaxy NGC 4449. A new method is defined to determine the sizes of the regions. We obtained the integrated parameters of the H II regions: radius, luminosity, radial velocity and velocity dispersion. We define the size and luminosity vs. velocity dispersion empirical correlations for the giant H II regions in the galaxy, and show that the correlations only hold for nebulae with surface brightness higher than 2×1035 erg s-1 pc-2 in H α and with a supersonic single line Gaussian profile. The exponent of the fits are consistent with virial mechanisms.

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