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Dynamical simulations of the interacting galaxies in the NGC 520/UGC 957 systemNumerical 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.
Document ID
19910042435
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Stanford, S. A.
(Wisconsin, University Madison, United States)
Balcells, Marc
(Groningen, State University Netherlands)
Date Acquired
August 14, 2013
Publication Date
March 20, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 370
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A27058
Funding Number(s)
CONTRACT_GRANT: NAS5-25451
Distribution Limits
Public
Copyright
Other

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