Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7435k&link_type=abstract
HST Proposal ID #7435
Physics
Hst Proposal Id #7435 Galaxies
Scientific paper
We propose to study the central kinematics of stellar populations in two recent merger remnants, NGC 7252 and NGC 3921. Ground-based spectra show these galaxies contain centrally concentrated young stellar populations and emission- line gas, indicative of a merger-induced episode of star formation. We have spectrally separated the kinematics of the young {A-star like} and old {metal-line} stars, and interestingly, the kinematic axes of the gas and of the stellar populations are different, suggesting that we are seeing the formation of kinematically-distinct cores. Given some of the unanswered questions surrounding the merger formation scenario in general {why are stellar populations so tightly related to overall structural parameters? Why are kinematically distinct cores so unremarkable photometrically? What drives core properties?}, it is therefore of interest to observe the central kinematics and populations with the high spatial resolution offered with STIS, to investigate the relation between merging and core/cusp morphology. These two merger remnants offer us the rare possibility to see the core formation process at work.
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