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ULTRAFAINT DWARF GALAXIES - THE LOWEST-MASS RELICS FROM BEFORE REIONIZATION

Bland-Hawthorn, Joss; Sutherland, Ralph; Webster, David

Description

New observations suggest that ultrafaint dwarf galaxies (UFDs) - the least luminous systems bound by dark matter halos (≲105 L⊙) - may have formed before reionization. The extrapolated virial masses today are uncertain, with estimates ranging from 108 M⊙ to as high as 109 M⊙ depending on the assumed form of the underlying potential. We show that the progenitor halo masses of UFDs can, in principle, be as low as M<inf>vir</inf> ≈ 107 M⊙. Under the right conditions, such a halo can survive the...[Show more]

CollectionsANU Research Publications
Date published: 2015
Type: Journal article
URI: http://hdl.handle.net/1885/103184
Source: Astrophysical Journal, The
DOI: 10.1088/0004-637X/807/2/154

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