The dynamics of a complex of interlocking giant shells in the Local Group dwarf galaxy IC 1613

Details The dynamics of a complex of interlocking giant shells in the Local Group dwarf galaxy IC 1613 The dynamics of a complex of interlocking giant shells in the Local Group dwarf galaxy IC 1613

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.235..479m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 235, Nov. 15, 1988, p. 479-492.

Astronomy and Astrophysics

Astronomy

21

Astronomical Spectroscopy, Dwarf Galaxies, Irregular Galaxies, Local Group (Astronomy), Emission Spectra, H Alpha Line, H Ii Regions, O Stars, Radio Emission, Stellar Winds, Supernovae

Scientific paper

Observations have been made with the Manchester echelle spectrometer on the William Herschel telescope of the region of giant interstellar shells in the Local Group dwarf galaxy IC 1613. Photon counting imagery of this complex has revealed six giant shells with diameters of 68-308 pc. Observations of the H-alpha line profiles with a five-element multislit over these shells demonstrate that systematic radial expansion is occurring in all cases. Expansion velocities range from 29-51 km/s. Where a shell surrounds an OB association there is clear evidence that its filaments are radiatively ionized. However, it is argued that supernova explosions most likely dominate stellar winds in the creation of these giant expanding shells. This region of interlocking giant shells could be the first stage in the formation of a greater-than-1-kpc diameter supergiant shell.

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