Turbulent gas motions in giant H II regions. I - The case of NGC 604

Details Turbulent gas motions in giant H II regions. I - The case of NGC 604 Turbulent gas motions in giant H II regions. I - The case of NGC 604

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...141...49h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 141, no. 1, Dec. 1984, p. 49-55.

Astronomy and Astrophysics

Astrophysics

20

Gas Dynamics, Gravitational Fields, H Ii Regions, Stellar Winds, Turbulent Flow, Velocity Distribution, Charge Coupled Devices, H Alpha Line, Kinematics, Line Spectra, Radial Velocity, Radiant Flux Density

Scientific paper

CCD-imagery of NGC 604 in Hα, obtained through a tunable filter with 22 km s-1 passband is presented. Radial velocity and dispersion maps therefrom synthesized provide a global characterization of the nebular kinematics in terms of four components: (1) a large scale rotation-like or rolling motion, (2) local expansion of wind-driven shells with a scale of 60 pc, (3) relative motions of these shells, and (4) an overall expansion of the nebular complex. The velocity dispersion at the core is 25 km s-1. The overall dispersion, 17.8 km s-1, cannot be solely interpreted in terms of the virial theorem. The radial dependence of the nebular brightness, nevertheless, resembles that of a gravitationally bound system.

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