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The frequency and properties of young tidal dwarf galaxies in nearby groups

  • K. Lee-Waddell (a1), K. Spekkens (a2), P. Chandra (a3), N. Patra (a3), J.-C. Cuillandre (a4), J. Wang (a1), M. P. Haynes (a5), J. Cannon (a6), S. Stierwalt (a7), J. Sick (a8) and R. Giovanelli (a5)...

Abstract

We present the results of a multi-wavelength investigation of the dwarf galaxy populations in three interacting galaxy groups: NGC 871/6/7, NGC 3166/9, NGC 4725/47. Using degree-scale Giant Metrewave Radio Telescope Hi mosaics and deep optical photometry from the Canada-France-Hawaii Telescope, we measured the Hi and stellar properties of the gas-rich low-mass group members to classify each one as a classical dwarf galaxy, a short-lived tidal knot or a tidal dwarf galaxy (TDG). Our observations detect several dwarf irregulars and various tidal knots. We identify four potentially long-lived tidal objects in the three groups, implying that TDGs are not readily produced. The tidal objects examined in this small survey also appear to have a wider variety of properties than TDGs formed in current simulations.

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References

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