On the Size and Luminosity versus Velocity Dispersion Correlations from the Giant H II Regions in the Irregular Galaxy NGC 4449

Details On the Size and Luminosity versus Velocity Dispersion Correlations from the Giant H II Regions in the Irregular Galaxy NGC 4449 On the Size and Luminosity versus Velocity Dispersion Correlations from the Giant H II Regions in the Irregular Galaxy NGC 4449

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....120..752f&link_type=abstract

The Astronomical Journal, Volume 120, Issue 2, pp. 752-762.

Astronomy and Astrophysics

Astronomy

18

Galaxies: Individual: Ngc Number: Ngc 4449, Ism: H Ii Regions, Turbulence

Scientific paper

Here we present the size and luminosity versus velocity dispersion empirical correlations for the giant H II regions in the large irregular galaxy NGC 4449. We show that correlations only hold for nebulae with a surface brightness higher than 2×1035 ergs s-1 pc-2 in Hα and with a supersonic single-line Gaussian profile. The exponents of the fits are consistent with virial mechanisms. A comparison with the results from other studies that have only used first-ranked giant H II regions from a variety of star-forming galaxies is also given.

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