Star formation rates in isolated galaxies selected from the Two-Micron
  All-Sky Survey
  We have considered the star formation properties of 1616 isolated galaxies
from the 2MASS XSC selected sample (2MIG) with the FUV GALEX magnitudes. This
sample was then compared with corresponding properties of isolated galaxies
from the Local Orphan Galaxies catalogue (LOG) and paired galaxies.
  We found that different selection algorithms define different populations of
isolated galaxies. The population of the LOG catalogue, selected from
non-clustered galaxies in the Local Supercluster volume, mostly consists of
low-mass spiral and late type galaxies. The SSFR upper limit in isolated and
paired galaxies does not exceed the value of ~dex(-9.4). This is probably
common for galaxies of differing activity and environment (at least at z<0.06).
The fractions of quenched galaxies are nearly twice as high in the paired
galaxy sample as in the 2MIG isolated galaxy sample. From the behaviour of
(S)SFR vs. M_* relations we deduced that the characteristic value influencing
evolutionary processes is the galaxy mass. However the environmental influence
is notable: paired massive galaxies with logM_*>11.5 have higher (S)SFR than
isolated galaxies. Our results suggest that the environment helps to trigger
the star formation in the highest mass galaxies. We found that the fraction of
AGN in the paired sample is only a little higher than in our isolated galaxy
sample. We assume that AGN phenomenon is probably defined by secular galaxy
evolution.
