Bibcode
DOI
Stanford, S. A.; Balcells, Marc
Bibliographical reference
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 370, March 20, 1991, p. 118-129.
Advertised on:
3
1991
Journal
Citations
28
Refereed citations
27
Description
Numerical simulations of the interacting galaxies in the NGC 520/UGC 957
system are presented. Two sets of models were produced to investigate
the postulated three-galaxy system of two colliding disk galaxies within
NGC 520 and the dwarf galaxy UGC 957. The first set of models simulated
a dwarf perturbing one-disk galaxy, which tested the possibility that
NGC 520 contains only one galaxy disturbed by the passage of UGC 957.
The resulting morphology of the perturbed single disk in the simulation
fails to reproduce the observed tidal tails and northwest mass
condensation of NGC 520. A second set of models simulated two colliding
disks, which tested the hypothesis that NGC 520 itself contains two
galaxies in a strong collision and UGC 957 is unimportant to the
interaction. These disk-disk models produced a good match to the
morphology of the present NGC 520. It is concluded that (1) NGC 520
contains two colliding disk galaxies which have produced the brighter
southern half of the long tidal tail and (2) UGC 957, which may
originally have been a satellite of one of the disk galaxies, formed the
diffuse northern tail as it orbited NGC 520.