Turbulent gas motions in giant H II regions. II - The luminosity-velocity dispersion relation

Details Turbulent gas motions in giant H II regions. II - The luminosity-velocity dispersion relation Turbulent gas motions in giant H II regions. II - The luminosity-velocity dispersion relation

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...160..374h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 160, no. 2, May 1986, p. 374-384.

Astronomy and Astrophysics

Astrophysics

53

Flow Velocity, H Ii Regions, Nebulae, Stellar Winds, Turbulent Flow, Astronomical Catalogs, H Alpha Line, Kinematics, Oxygen Spectra, Velocity Distribution

Scientific paper

The velocity dispersion for 43 giant extragalactic H II regions has been measured in Hα and in [O III] λ5007 in order to reinvestigate the relation between luminosity L(Hα) and velocity dispersion σ. A correlation L(Hα) ∝ σ(Hα)6.6 is indicated. The velocity dispersions derived from the [O III] line obey a similar relation but are somewhat smaller. The slope of both relations is steeper than expected for gravitationally bound systems. Several contributors to the kinematical state of giant H II regions have to be considered. Stellar winds seem to play the dominant role for the objects with 1038 < L(Hα) < 1040erg s-1.

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