Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9381w&link_type=abstract
HST Proposal ID #9381
Other
Hst Proposal Id #9381
Scientific paper
The extended tidal arm of neutral gas near NGC 3077 {member of the M 81 triplet, D 3.8 Mpc} is one of the most dramatic features of its kind seen in the local universe; it was created by an interaction with M 81 some 3*10^8 yr ago. It is one of the few tidal systems where atomic {HI} and molecular {CO} gas as well as low-level star formation {HAlpha} is detected over an area of several kpc^2. This tidal complex is believed to be in the process of forming a tidal dwarf galaxy. 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 this tidally created system. By combining various methods to recover the star formation history {e.g., using the luminosity function of the core Helium burning stars} we will 1} measure the SF history since closest encounter with M 81, 2} determine whether older stars are present in the tidal feature or not and 3} investigate propagation of star formation across the tidal feature. This can be done with F435W, F555W, and F814W imaging using HST's ACS with only 8 orbits. We will, for the first time, recover the star formation history and the distribution of stars within a tidally created system. This study will also shed light on the creation and evolution of other tidal dwarf galaxies which are typically much further away.
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