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- Title
Deep optical imaging of the dark galaxy candidate AGESVC1 282.
- Authors
Bílek, Michal; Müller, Oliver; Vudragović, Ana; Taylor, Rhys
- Abstract
The blind H I survey Arecibo Galaxy Environment Survey (AGES) detected several unresolved sources in the Virgo cluster, which do not have optical counterparts in 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 from cosmological simulations. In order to reveal the nature of the dark clouds, we took a deep optical image of one them, AGESVC1 282, with the newly-commissioned 1.4 m Milanković Telescope. After observing it for 10.4 h 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 × 107 L⊙, giving a stellar mass below 1.4 × 107 M⊙ and a H I-to-stellar mass ratio above 3.1. By inspecting archival H I observations of the surrounding region, we found that none of the standard explanations for optically dark H I clouds fits the available constraints on this object.
- Subjects
SLOAN Digital Sky Survey; OPTICAL images; VIRGO Cluster; GALAXIES; STELLAR mass; ASTRONOMICAL surveys; SURFACE brightness (Astronomy)
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2020, Vol 642, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/202039174