A Merger Origin for X-Structures in S0 Galaxies

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dc.creatorMihos, Chris
dc.creatorWalker, Ian
dc.creatorHernquist, Lars
dc.creatorde Oliviera, Claudia Mendes
dc.creatorBolte, Mike
dc.date1995-04-26
dc.date.accessioned2026-07-07T02:19:45Z
dc.date.available2026-07-07T02:19:45Z
dc.descriptionUsing numerical simulation, we study the response of a disk galaxy to a merger involving a low-mass satellite companion. During a prograde satellite accretion, the disk galaxy forms a strong bar in response to the perturbation of the companion. After the accretion event is over, the bar buckles vertically due to a bending instability, sending disk material well out of the disk plane. The material forms into an X-shaped feature when seen edge-on, morphologically similar to X-structures observed in several S0/Sa galaxies. The mechanism described here unites previously suggested accretion and bar instability hypotheses for forming X-structures into a self-consistent scenario for merger-induced formation and evolution of S0 galaxies. To complement these models, we also present observations of the peculiar S0 galaxy Hickson 87a. The thick disk, isophotal warping, and strong X-structure described in the merger model are all evident in Hickson 87a, suggesting this galaxy may be an excellent example of such merger-induced galaxy evolution.
dc.description6 pages of uuencoded compressed postscript. Accepted to ApJ Letters. 5 postscript figures available from http://www.ucolick.org/~hos/preprints/X/abstract.html
dc.identifierhttps://arxiv.org/abs/astro-ph/9504094
dc.identifierhttp://arxiv.org/abs/astro-ph/9504094
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/9992
dc.subjectAstrophysics
dc.titleA Merger Origin for X-Structures in S0 Galaxies
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