The 3-D Shape of the SMC: Is It Tidally Distorted?

Details The 3-D Shape of the SMC: Is It Tidally Distorted? The 3-D Shape of the SMC: Is It Tidally Distorted?

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10126o&link_type=abstract

HST Proposal ID #10126

Physics

Hst Proposal Id #10126 Stellar Populations

Scientific paper

We propose to exploit the exceptional spatial resolution of HST to definitively show whether the SMC is tidally elongated along the line-of-sight, and therefore the status of the Milky Way's interaction/destruction of the Magellanic Clouds. We use BVI ACS images of several crowded SMC fields in the region predicted by models of the orbit and tidal evolution of the Magellanic Clouds {and by observations of Cepheids} to have a large depth. We exploit the red clump feature {and the rarer true horizontal branch} to derive the depth. Specifically, we will observe six fields along the predicted region of maximum distance gradient of the SMC, along with two ACS fields and several WFPC2 fields in the archives, to map out the depth of the SMC in this region. We are searching for substructure, such as a tidal tail, that may be present. Crowding in this region of the SMC is so severe that this project cannot be done from the ground.

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