Journal
ASTROPHYSICAL JOURNAL
Volume 724, Issue 1, Pages 267-284Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/724/1/267
Keywords
galaxies: elliptical and lenticular, cD; galaxies: individual (NGC 4696); galaxies: interactions; galaxies: ISM; shock waves; techniques: imaging spectroscopy
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Funding
- Australian Department of Science and Education (DEST) Systemic Infrastructure Initiative
- Australian Research Council (ARC) [LE0775546, DP0984657, DP0664434, DP0342844]
- National Aeronautics and Space Administration
- Australian Research Council [DP0664434, DP0342844, LE0775546] Funding Source: Australian Research Council
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We present deep optical integral-field spectroscopic observations of the nearby ( z similar to 0.01) brightest cluster galaxy NGC 4696 in the core of the Centaurus Cluster, made with the Wide Field Spectrograph on the Australian National University 2.3 m telescope at Siding Spring Observatory. We investigate the morphology, kinematics, and excitation of the emission-line filaments and discuss these in the context of a model of a minor merger. We suggest that the emission-line filaments in this object have their origin in the accretion of a gas-rich galaxy and that they are excited by v similar to 100-200 km s(-1) shocks driven into the cool filament gas by the ram pressure of the transonic passage of the merging system through the hot halo gas of NGC 4696.
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