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The ALFALFA Almost Dark Galaxy AGC 229101: A 2 Billion Solar Mass H I Cloud with a Very Low Surface Brightness Optical Counterpart

  • Authors: Lukas Leisman, Katherine L. Rhode, Catherine Ball, Hannah J. Pagel, John M. Cannon, John J. Salzer, Steven Janowiecki, William F. Janesh, Gyula I. G. Józsa, Riccardo Giovanelli, Martha P. Haynes, Elizabeth A. K. Adams, Laurin Gray, Nicholas J. Smith

Lukas Leisman et al 2021 The Astronomical Journal 162 .

  • Provider: AAS Journals

Caption: Figure 8.

Baryon to dynamical mass fraction vs. dynamical mass for AGC 229101 (pink star) compared to the ALFALFA UDG sample from Mancera Piña et al. (2019b), and dwarf galaxies from LITTLE THINGS. While AGC 229101 has a larger gas fraction and lower surface brightness than the Mancera Piña et al. (2019b) sample, it appears to have similarly high baryonic mass for its rotation velocity; within R H I AGC 229101 requires no additional dark-matter component.

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