Investigating the Powering Sources of Expanding Supergiant Shells in the Nearby Dwarf Galaxy IC 2574

Details Investigating the Powering Sources of Expanding Supergiant Shells in the Nearby Dwarf Galaxy IC 2574 Investigating the Powering Sources of Expanding Supergiant Shells in the Nearby Dwarf Galaxy IC 2574

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9755w&link_type=abstract

HST Proposal ID #9755

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Hst Proposal Id #9755 Galaxies

Scientific paper

Using the unique resolving capability of the Hubble Space Telescope {HST} and the wide-field imaging capabilities of the ACS, we propose to perform a stellar population study of two prominent supergiant shells {SGS} in the nearby dwarf galaxy IC2574. By constructing the star formation history for those SGSs we will for the first time be able to test if past star formation created these impressive structures, as suggested by theory. We have carefully selected 2 SGSs; one is young {age: few 10^7yr, exhibiting a prominent central stellar association and the other is older {few 10^8yr}, with no obvious optical counterpart. The aim of this proposal is to determine the age and SF history of the central stellar associations of both SGSs by B, V, and I band imaging using HST's ACS. A primary goal is the comparison of the stellar ages with the age estimates from the HI kinematics. Using color magnitude diagrams, we will also estimate how many stars have evolved off the main sequence and exploded as SN, giving an estimate for the total mechanical energy deposited. A comparison with the values derived in other wavelengths is not only important for understanding these particular SGSs but will also set strong timing as well as energy constraints on the physical mechanisms which lie at the origin of SGSs in general.

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