Discovery of Large Diffuse Dwarf Galaxies in Isolated Triple Systems

Recent research has unveiled the discovery of three large diffuse dwarf (LDD) galaxies situated within isolated triple systems. These galaxies exhibit effective diameters ranging from 3.6 to 10.0 kiloparsecs and have effective surface brightness values between 26.2 and 27.3 magnitudes per square arcsecond. The study indicates that LDD galaxies tend to cluster in small groups characterized by a very low dispersion of radial velocities. Notably, the total orbital mass of these triplet systems is approximately equal to their integral stellar mass, considering measurement errors related to velocity. The presence of LDD galaxies in dynamically cold multiple systems raises intriguing questions regarding their formation and evolution.

The findings contribute to the understanding of galaxy formation in the universe, particularly in relation to the dynamics of dwarf galaxies. The research highlights the unusual characteristics of these galaxies and suggests that their existence within such systems could provide insights into the processes that govern galaxy interactions and evolution.

The study, titled "Large diffuse dwarfs in the dynamically cold triple system," has been accepted for publication in Astrophysics and includes detailed analysis supported by figures and tables. The authors of the paper include I.D. Karachentsev, A.E. Nazarova, and V.E. Karachentseva. For further details, the paper can be accessed here.