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

Published online by Cambridge University Press:  21 March 2017

K. Lee-Waddell
Affiliation:
CSIRO Astronomy and Space Science, Australia Telescope National Facility, PO Box 76 Epping, NSW 1710, Australia email: Karen.Lee-Waddell@csiro.au
K. Spekkens
Affiliation:
Department of Physics, Royal Military College of Canada, PO Box 17000, Station Forces Kingston, ON K7K 7B4, Canada
P. Chandra
Affiliation:
National Centre for Radio Astrophysics, Tata Institute of Fundamental Research Pune 411 007, India
N. Patra
Affiliation:
National Centre for Radio Astrophysics, Tata Institute of Fundamental Research Pune 411 007, India
J.-C. Cuillandre
Affiliation:
CEA/IRFU/SAp, Laboratoire AIM Paris-Saclay, CNRS/INSU, Université Paris Diderot Observatoire de Paris, PSL Research University F-91191 Gif-sur-Yvette Cedex, France
J. Wang
Affiliation:
CSIRO Astronomy and Space Science, Australia Telescope National Facility, PO Box 76 Epping, NSW 1710, Australia email: Karen.Lee-Waddell@csiro.au
M. P. Haynes
Affiliation:
Cornell Center for Astrophysics and Planetary Science, Cornell University Ithaca, NY 14853, USA
J. Cannon
Affiliation:
Department of Physics and Astronomy, Macalester College, 1600 Grand Avenue Saint Paul, MN 55105, USA
S. Stierwalt
Affiliation:
Department of Astronomy, University of Virginia, 530 McCormick Road Charlottesville, VA 22904, USA
J. Sick
Affiliation:
Department of Physics, Engineering Physics and Astronomy, Queen’s University Kingston, ON K7L 3N6, Canada
R. Giovanelli
Affiliation:
Cornell Center for Astrophysics and Planetary Science, Cornell University Ithaca, NY 14853, USA
Corresponding
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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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2017 

References

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