New Probable Dwarf Galaxies in Northern Groups of the Local Supercluster

TL;DR

This study reports the discovery of 90 new low-surface-brightness dwarf galaxy candidates in northern groups of the Local Supercluster, with most being previously uncataloged and exhibiting properties consistent with dwarf galaxies.

Contribution

The paper presents the identification and characterization of new dwarf galaxy candidates in nearby groups, expanding the known population and providing observational data on their properties.

Findings

90 new low-surface-brightness objects found

Most objects are irregular dwarf systems

Properties match expected dwarf galaxy characteristics

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), and hydrogen masses (~2*10^7M_sun) galaxies correspond to those expected for the dwarf population of nearby groups.