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

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

2006-02-28

arxiv.org/abs/astro-ph/0602621v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in Astronomy & Astrophysics; 18 pages, 13 figures; the tables of Appendix C can be downloaded at ht

Scientific paper

10.1051/0004-6361:20054692

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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