The StEllar Counterparts of COmpact high velocity clouds (SECCO) survey. I. Photos of ghosts
M. Bellazzini (1), G. Beccari (2), G. Battaglia (3,1), N. Martin, (4,5), V. Testa (6), R. Ibata (4), M. Correnti (7), F. Cusano (1), E. Sani, (8) ((1) INAF - OA Bologna, (2) ESO Chile, (3) IAC La Laguna, (4) Obs. de, Strasbourg - CNRS, (5) MPIA Heidelberg, (6) INAF - OA Roma

TL;DR
This survey searched for stellar counterparts of ultra-compact high-velocity HI clouds using the Large Binocular Telescope but found no evidence of associated dwarf galaxies within 1.5 Mpc, suggesting these clouds are unlikely to be typical Local Group dwarfs.
Contribution
The first wide-field imaging survey targeting the stellar counterparts of UCHVCs, providing constraints on their nature and ruling out typical dwarf galaxy associations.
Findings
No stellar counterparts detected for most UCHVCs.
Survey sensitivity rules out dwarf galaxies brighter than M_V=-8 within 1.5 Mpc.
Most UCHVCs are unlikely to be associated with known dwarf galaxies.
Abstract
We present an imaging survey aimed at searching for the stellar counterparts of recently discovered ultra-compact high-velocity HI clouds (UCHVC). Adams et al. (2013) proposed these clouds to be candidate mini-haloes in the Local Group and/or its surroundings, within a distance range of 0.25-2.0 Mpc. Using the Large Binocular Telescope we obtain wide-field (~ 23' X 23') g- and r-band images of the twenty-five most promising and most compact clouds among the fifty-nine identified by Adams et al. Careful visual inspection of all the images does not reveal any stellar counterpart even slightly resembling LeoP, the only local dwarf galaxy that was found as a counterpart to a previously detected high velocity cloud. Only a possible distant (D>3.0 Mpc) counterpart to HVC274.68+74.70-123 has been identified on our images. The point source photometry in the central 17.3' X 7.7' chips reaches…
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