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

نویسندگان

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

We present the result of radio and optical observations of the S0 galaxy IC 4200. We find that the galaxy hosts 8.5×10 9 M ⊙ of H  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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تاریخ انتشار 2006