Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-11
Astronomy and Astrophysics
Astrophysics
ApJ, to appear September 20, 2000
Scientific paper
10.1086/309542
We examine the observational consequences of the two possible origins for irregular galaxies: formation from collapse of a primordial cloud of gas early in the age of the Universe, and formation from tidal tails in an interaction that could have occured any time in the history of the Universe. Because the formation from tidal tails could have occurred a long time ago, proximity to larger galaxies is not sufficient to distinguish tidal dwarfs from traditional dwarfs. We consider the effects of little or no dark matter on rotation speeds and the Tully-Fisher relationship, the metallicity-luminosity relationship, structure, and stellar populations. From these selection criteria, we identify a small list of dwarf irregular galaxies that are candidates for having formed as tidal dwarfs.
Hunsberger Sally D.
Hunter Deidre Ann
Roye Erin W.
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