The Role of Galaxy Interactions in H II Galaxies

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Blue Compact Dwarf Galaxies, Dynamics Of Dwarf Galaxies, Galaxy Interaction

Scientific paper

A statistical relationship between interactions and elevated star formation rates was found by Taylor (1997) for gas rich dwarf galaxies. That study was not able to conclude what physical mechanism was responsible for this relationship. To study the physics involved, we have obtained VLA C-array observations in the H I line. These data show that H II galaxies tend to have dense concentrations of H I overlapping spatially with their stellar components, often have large H I holes, and have velocity fields indicating solid-body rotation. We plan to combine the new observations of 6 H II galaxies with previous observations of 5 others. By comparing the kinematics and morphology of the isolated systems with those of the interacting systems, we hope to determine how the interactions affect the physical properties of the H II galaxies.

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