Volume 642, October 2020
|Number of page(s)||5|
|Section||Letters to the Editor|
|Published online||08 October 2020|
Letter to the Editor
Deep optical imaging of the dark galaxy candidate AGESVC1 282⋆
Université de Strasbourg, CNRS, Observatoire Astronomique de Strasbourg (ObAS), UMR 7550, 67000 Strasbourg, France
2 Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia
3 Astronomical Institute of the Czech Academy of Sciences, Boční II 1401/1a, 141 00 Praha 4, Czech Republic
Accepted: 21 September 2020
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.
Key words: galaxies: individual: AGESVC1 282 / galaxies: formation / techniques: image processing / galaxies: interactions / galaxies: structure / galaxies: clusters: intracluster medium
Data underlying to Fig. 1 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (184.108.40.206) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/642/L10
© M. Bílek et al. 2020
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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