期刊
ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS
卷 33, 期 8, 页码 512-519出版社
PLEIADES PUBLISHING INC
DOI: 10.1134/S1063773707080026
关键词
dwarf galaxies; groups of galaxies
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 (similar to 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 (similar to 30 km s(-1)), and hydrogen masses (similar to 2 x 10(7) M circle dot) of the new galaxies correspond to those expected for the dwarf population of nearby groups.
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