The ALFALFA Almost-Dark Galaxy AGC~229101: A Two Billion Solar Mass HI Cloud with a Very Low Surface Brightness Optical Counterpart

Lukas Leisman, Katherine L. Rhode, Catherine Ball +11

We present results from deep HI and optical imaging of AGC 229101, an unusual HI source detected at v${}_{\mathrm{helio}}$ = 7116 km/s in the ALFALFA survey. Initially classified as a can…