Parameters of bulges and disks of interacting galaxies

The photometric structure of 23 interacting galaxies is analyzed, It is sho wn that equivalent photometric profiles, if used for statistical analyses o f the global structure of the disks of spiral galaxies, yield the same resu lts as major-axis profiles. When analyzing nonaxisymmetric and faint object s, the equivalent profiles should be preferred to both the major-axis and e lliptically averaged profiles. The studies of integral characteristics of b ulges of interacting spiral galaxies showed that the parameters of these ob jects obey the mu(e)-r(e) relation for normal spirals over a wide range of surface-brightness (similar to 10(m)) and linear-dimension (similar to 3 x 10(2)) values, This fact may imply that strong gravitational perturbations have little effect on dense central galaxy regions, leaving the bulges in a state that is very close to equilibrium The central parts of disks in inte racting spirals are, on the average, similar to 1(m) brighter than the corr esponding regions in isolated galaxies, which is probably attributable to e nhanced star-formation process, Integrated photometric parameters of the di sks of local interacting galaxies are similar to those of spiral galaxies o f comparable size observed at z similar to 1. The latter are also character ized by high surface brightness. Among them, interacting or disturbed objec ts comprise a sizable fraction. It may be assumed that gravitational pertur bations and external accretion contribute significantly to the observed evo lution of disk parameters in large spiral galaxies, when z similar to 1.