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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 1.

WIYN 3.5 m pODI combined g- and r-band color image of AGC 229101 with H I column density contours from WSRT only imaging at 1, 2, 4, 8, and 16 × 1019 cm−2 overlaid in white. The image is oriented N-up, E-left. Faint, diffuse optical emission is barely visible at the location of the northern H I column density peak, while the H I emission stretches over ∼80 kpc. The early-type galaxy to the southeast of AGC 229101 is unrelated and has an SDSS redshift of 0.176.

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