Studies of low-mass galaxies are important for populating the low-mass ends of funda- mental physical relations. Extremely metal-poor (XMP) galaxies are low-mass galaxies with gas-phase oxygen abundances of 12+log(O/H) ≤ 7.35 ( 1/20 Z⊙), and are especially interesting as proxies for studying the distant past, as their chemical makeup resembles those of galaxies in the early universe. AGC 198691, referred to as the Leoncino Dwarf, was discovered through the Arecibo Legacy Fast ALFA (ALFALFA) survey and found to have an oxygen abundance of less than 3% Z⊙. Presented here are the results of recent Karl G. Jansky Very Large Array (VLA) HI observations of Leoncino, with discussion of its apparently dispersion-dominated kinematics, level of agreement with mass-metallicity (MZ) and luminosity-metallicity (LZ) relations, current star formation, and theories regarding its extremely low metal content.
"The Leoncino Dwarf: A Neutral Hydrogen Analysis of AGC 198691 and its Extremely Metal-Poor Environment,"
Macalester Journal of Physics and Astronomy: Vol. 8
, Article 14.
Available at: https://digitalcommons.macalester.edu/mjpa/vol8/iss1/14