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IC 4200: a gas-rich early-type galaxy formed via a major merger

P. Serra·S. C. Trager·J. M. van der Hulst·T. A. Oosterloo·R. Morganti
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Abstract

We present the result of radio and optical observations of the S0 galaxy IC 4200. We find that the galaxy hosts 8.5 billion solar masses of HI rotating on a ~90 deg warped disk extended out to 60 kpc from the centre of the galaxy. Optical spectroscopy reveals a simple-stellar-population-equivalent age of 1.5 Gyr in the centre of the galaxy and V- and R-band images show stellar shells. Ionised gas is observed within the stellar body and is kinematically decoupled from the stars and characterised by LINER-like line ratios.We interpret these observational results as evidence for a major merger origin of IC 4200, and date the merger back to 1-3 Gyr ago.

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P. Serra, S. C. Trager, J. M. van der Hulst, T. A. Oosterloo, R. Morganti. 2006-02-28. IC 4200: a gas-rich early-type galaxy formed via a major merger. https://doi.org/10.1051/0004-6361%3A20054692

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