Geometric Measurement of Galaxy Distances

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Hst Proposal Id #9299

Scientific paper

We propose to utilize the imaging polarization capability of ACS to make observations of supernova light echoes in an investigation of their potential use for the geometric determination of galaxy distances. SN1991T in NGC4527 is a confirmed light echo close to the Virgo galaxy cluster. We will visit it twice, once early in the mission and then later to monitor its evolution. We will also obtain high resolution imaging polarization observations of other candidates to determine whether they are light echoes and to use them for distance estimation if possible. We will also acquire a deep field image in polarized light of a galaxy known to have hosted large numbers of historical supernovae. We will search for light echoes, plerions and other sources of polarized emission in the targets such as reflection nebulosity, light polarized by transmission through aligned grains, light echoes from other transients or variable stars and light scattering from the nucleus.

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