The sample contains 58 systems of galaxies, numbered from 1 to 59
(the galaxies numbered 57 and 58 are in gravitational interaction
and part of the same system).
The 58 sample objects come from a catalogue
of southern interacting galaxies
originally compiled by Bergvall (1981, hereafter B81).
The sample contains all interacting galaxies in a limited region of the sky
and
is complete down to the blue magnitude mB < 14.5.
The selection criteria are described in JB90.
The surveyed area was limited by
and 
.
Two types of objects were considered:
i) Interacting galaxies
were included in B81 if the diameter of the largest component
was 
. Galaxy pairs were regarded as interacting if one of the
following criteria was satisfied:
Both galaxies show a distorted morphology, have an angular separation
times the diameter of the largest component and a magnitude
difference 
.
At least one galaxy shows a distorted morphology, and the members have
an angular separation 
twice the diameter of the largest component
and a magnitude difference 
.
The galaxies are physically connected via a well-defined bridge.
ii) Single distorted galaxies were included if the diameter 
.
The sources names, coordinates and some of their characteristics are listed in Table 1 (click here), arranged as follows:
- Column 1: Galaxy number adapted from Johansson & Bergvall (1990).
- Column 2: Number in the ESO catalogue and other names.
- Columns 3 and 4: Source coordinates taken from the NED database. Unless specified differently, the positional accuracy is better than 8 arcsec in both coordinates.
- Column 5: Radio velocity computed from the heliocentric velocity taken from the NED database or given by Bergvall (private communication).
- Column 6: Morphological type taken from the Third Reference Catalogue of Bright Galaxies (de Vaucouleurs et al. 1991, RC3).
- Column 7: Decimal logarithm of the isophotal major diameter, D25, at 25 mag/arcsec2 taken from the RC3. The unit of D25 is 0.1 arcmin.
(a) JB01: uncertainty in position =
arcsec. NED gives also a radio velocity of 10079
km s-1.
(b) JB06_2: uncertainty in position = arcsec.
(c) JB14_2: other authors give 
km s-1.
(d) JB29_1: uncertainty in position = arcsec.
(e) JB33: uncertainty in position = 
arcsec.
Table 1: Galaxy characteristics
(f) JB40: uncertainty in position = 
arcsec
(g) HI line at 
km s-1 towards JB56.
Table 1: continued
Figure 1 (click here) shows an histogram of the radial velocities for the sample galaxies
(H
was detected by BJ95 in 57 of the 58 galaxy systems).
The median velocity is 
.
All the velocities quoted in this article are heliocentric, using
the radio definition 
= 
.
The distances
correspond to a Hubble constant 
(
).
Figure 1: Histogram of the radial velocities (in radio convention) for
the sample galaxies