The internal kinematics of the giant extragalactic H II complex NGC 604

Details The internal kinematics of the giant extragalactic H II complex NGC 604 The internal kinematics of the giant extragalactic H II complex NGC 604

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...130...29r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 130, no. 1, Jan. 1984, p. 29-38.

Astronomy and Astrophysics

Astrophysics

58

Astronomical Spectroscopy, Galactic Structure, Hydrogen Clouds, Interstellar Gas, Stellar Winds, Electron Density Profiles, Gas Dynamics, Ionized Gases, Radial Velocity, Wolf-Rayet Stars

Scientific paper

Fourteen long slit coudespectra have been obtained across the giant H II complex NGC 604 in M 33. These spectrograms verify the existence of highly supersonic motions in the ionized gas. The complexity of the velocity field in NGC 604 appears to be a direct counterpart of its chaotic morphology. Several shells with high expansion velocities (up to 60 km/s) and layers of material approaching the observer with relative velocities of up to 100 km/s can be traced in the vicinity of the Wolf-Rayet star clusters. The dominance of gravitational motions in broadening the emission line profiles is clearly ruled out. However, the observations cannot be explained by a simple theoretical picture of expanding spherical stellar wind blown bubbles. NGC 604 shows the typical aspects of a blister-like inhomogeneous H II complex, expanding into the low density interarm medium with internal activity in the form of stellar winds superimposed. The remarkable similarities with the 30 Dor complex suggest that other, more distant and spatially unresolved, giant extragalactic H II complexes have comparable structures and internal kinematics.

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