Computer Science
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9553m&link_type=abstract
HST Proposal ID #9553
Computer Science
Hst Proposal Id #9553 Ism And Circumstellar
Scientific paper
We propose to analyze all the nebular WFPC2 observations of massive young clusters {MYCs} within 10 Mpc in order to understand the interaction with the surrounding medium which leads to the creation of superbubbles. In a previous analysis we detected a discrepancy between the measured and the expected size distribution of superbubble sizes around a small sample of nearby MYCs. We propose to measure the diameters of the hot cavities created around the clusters by the stellar winds and supernovae for all the objects in this extended sample. The data will be combined with ground-based high- spectral-resolution spectroscopic observations of a subsample of the clusters in order to relate the cavity size to the velocity dispersion of the warm gas. Our final goals are: {i} to verify the existence of the discrepancy between the expected and the measured cavity size distribution and to find an explanation for it, and {ii} to discern which is the energy source that mantains the supersonic velocity dispersion of the warm gas in Giant H, ii Regions: gravity, stellar winds, radiation, or a combination of them. In order to do that we will generate 3-D hydrodynamic simulations which include the effects of gravity and radiation and compare them with the observed data.
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