New probable dwarf galaxies in northern groups of the Local Supercluster |
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Authors: | I D Karachentsev V E Karachentseva W K Huchtmeier |
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Institution: | (1) Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, 369167, Karachai-Cherkessian Republic, Russia;(2) Astronomical Observatory, Kiev National University, ul. Observatorna 3, Kiev, 04053, Ukraine;(3) Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany |
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Abstract: | We have searched for nearby dwarf galaxies in 27 northern groups with characteristic distances 8–15 Mpc based on the Second Palomar Sky Survey prints. In a total area of about 2000 square degrees, we have found 90 low-surface-brightness objects, more than 60% of which are absent from known catalogs and lists. We have classified most of these objects (~80%) as irregular dwarf systems. The first 21-cm line observations of the new objects with the 100-m Effelsberg radio telescope showed that the typical linear diameters (1–2 kpc), internal motions (~30 km s?1), and hydrogen masses (~2 × 107 M ⊙) of the new galaxies correspond to those expected for the dwarf population of nearby groups. |
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Keywords: | dwarf galaxies groups of galaxies |
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