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The blind HI survey Arecibo Galaxy Environment Survey (AGES) detected severalunresolved sources in the Virgo cluster, which do not have optical counterpartsin the Sloan Digital Sky Survey. The origin of these dark clouds is unknown.They might be crucial objects since they could be the so-called dark galaxies,that is, the dark matter halos without stellar content that are expected fromcosmological simulations. In order to reveal the nature of the dark clouds, wetook a deep optical image of one them, AGESVC1 282, with the newly-commissioned1.4m Milankovi\'c Telescope. After observing it for 10.4h in the $L$-filter,the image reached a surface-brightness limit of about 29.1 mag arcsec$^{-2}$ in$V$. No optical counterpart was detected. We placed an upper limit on the$V$-band luminosity of the object of $1.1\times10^7\,L_\odot$, giving a stellarmass below $1.4\times10^7\,M_\odot$ and a HI-to-stellar mass ratio above 3.1.By inspecting archival HI observations of the surrounding region, we found thatnone of the standard explanations for optically dark HI clouds fits theavailable constraints on this object.

Deep optical imaging of the dark galaxy candidate AGESVC1 282