The All-Sky Catalog of Isolated Galaxies selected from 2MASS

Understand

We undertook searches for isolated galaxies based on automatic selection of infrared sources from the Two Micron All-Sky Survey (2MASS) followed by a visual inspection of their surrounding.

• Using a modified criterion by Karachentseva (1973), we compiled a catalog of 3227 isolated galaxies (2MIG) containing 6% of 2MASS Extended Sources (2MASX) brighter than $K_s = 12^m$ with angular diameters $a_K \geq 30\arcsec$.
• The most isolated 2493 galaxies among them enter in the 2MASS Very Isolated Galaxy Catalog, 2MVIG.
• Being situated in the regions of extremely low mass density, the 2MVIG galaxies can serve as a reference sample for investigation the influence of environment on structure and evolution of galaxies.