KKR 18: A Late Arrival Galaxy?
astro-ph.GA
Submitted: 2026-09-03
Updated: 2026-09-03
Comments: 12 pages, 13 figures. Submitted to The Astrophysical Journal
License: http://creativecommons.org/licenses/by/4.0/
The gist: KKR 18 is a dwarf irregular galaxy in the Local Void at a distance of 9.46 Mpc.
Terminology
Abstract
KKR 18 is a dwarf irregular galaxy in the Local Void at a distance of 9.46 Mpc. It is gas rich and was experiencing vigorous star formation 20 - 100 Myr ago. Its metallicity is 4% of Solar from an emission spectrum, qualifying is as extremely metal poor (XMP). Its most remarkable characteristic is an extremely deficient Red Giant Branch. This feature is shared with a small number of other dwarf galaxies and it is inferred that they lack ancient stellar components. It is suggested that these are late arrival galaxies (LAG).
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