Identifying Old Tidal Dwarf Irregulars | Zendy

Deidre A. Hunter | Zendy; S. Hunsberger | Zendy; E. Roye | Zendy

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Identifying Old Tidal Dwarf Irregulars

Author(s) -

Deidre A. Hunter,

S. Hunsberger,

E. Roye

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/309542

Subject(s) - dwarf galaxy , astrophysics , physics , galaxy , dwarf galaxy problem , universe , astronomy , tidal force , tidal heating , luminosity , metallicity , dark matter , interacting galaxy , planet

We examine the observational consequences of the two possible origins forirregular galaxies: formation from collapse of a primordial cloud of gas earlyin the age of the Universe, and formation from tidal tails in an interactionthat could have occured any time in the history of the Universe. Because theformation from tidal tails could have occurred a long time ago, proximity tolarger galaxies is not sufficient to distinguish tidal dwarfs from traditionaldwarfs. We consider the effects of little or no dark matter on rotation speedsand the Tully-Fisher relationship, the metallicity-luminosity relationship,structure, and stellar populations. From these selection criteria, we identifya small list of dwarf irregular galaxies that are candidates for having formedas tidal dwarfs.Comment: ApJ, to appear September 20, 200

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