High Resolution Mapping of Expanding Shells in IC10

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present the results of an investigation of the effects of massive star formation on the neutral hydrogen (HI) gas in the interstellar medium of the dwarf starburst galaxy IC10. Studies suggest that energy output from star formation has a significant impact on the dynamics of the ISM, contributing to further star formation and galactic evolution. However, due to interactions between structures in the ISM, only a small fraction of the energy put out by the massive stars in IC10 seems to be transferred to the gas.
Using high-resolution ( 2”) 21-cm wavelength radio telescope data collected at the Very Large Array, we estimate the mass and velocity of the HI gas in these shells and determine its kinetic energy. Using optical data from the Hubble Space Telescope, we locate stars within the shells and obtain their energy output. Comparing these data sets allows us to determine how much of the stars' energy output goes into the kinetic energy of the ISM.
This work was supported by the National Science Foundation's REU program and the Department of Defense's ASSURE program through NSF Award AST-0453442.

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