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1999AJ....118..273W - Astron. J., 118, 273-301 (1999/July-0)
Holes and shells in the interstellar medium of the nearby dwarf galaxy IC 2574.
WALTER F. and BRINKS E.
Abstract (from CDS):
The scale height of the H I layer is found to be ~350 pc, considerably thicker than that in massive disk galaxies. This is due to a lower gravitational potential (for the same observed one-dimensional velocity dispersion of ~7 km.s–1). This puffed-up disk implies a lower H I volume density (0.15 cm–3). This fact, combined with the reduced gravitational pull and solid-body rotation throughout the disk, explains why the diameter distribution in dwarf galaxies extends to substantially larger values than in spiral galaxies. A comparison with other galaxies shows that the energies needed to create these structures are the same for all types of galaxies, at least to first order. The overall statistical properties of the H I holes and shells in galaxies show clear trends with Hubble type (or rather mass), such as in their diameter distribution, expansion velocities, and ages.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: Individual: Alphanumeric: IC 2574 - Galaxies: ISM - ISM: Structure - Radio Emission Lines
Nomenclature: Table 3: [WB99] Hole NN (Nos 1-48). Table 5: [WB99] HII NN (Nos 1-40).
Simbad objects: 193
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