Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-16532
Mapelli, M; Moore, B; Bland-Hawthorn, J (2008). Lopsided galaxies: the case of NGC 891. Monthly Notices of the Royal Astronomical Society, 388(2):697-708.
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It has been known for a long time that a large fraction of disc galaxies are lopsided. We simulate three different mechanisms that can induce lopsidedness: flyby interactions, gas accretion from cosmological filaments and ram pressure from the intergalactic medium. Comparing the morphologies, H i spectrum, kinematics and m= 1 Fourier components, we find that all of these mechanisms can induce lopsidedness in galaxies, although in different degrees and with observable consequences. The time-scale over which lopsidedness persists suggests that flybys can contribute to ∼20 per cent of lopsided galaxies. We focus our detailed comparison on the case of NGC 891, a lopsided, edge-on galaxy with a nearby companion (UGC 1807). We find that the main properties of NGC 891 (morphology, H i spectrum, rotation curve, existence of a gaseous filament pointing towards UGC 1807) favour a flyby event for the origin of lopsidedness in this galaxy.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute for Computational Science|
|Dewey Decimal Classification:||530 Physics|
|Deposited On:||10 Mar 2009 14:33|
|Last Modified:||24 Jan 2014 04:05|
|Additional Information:||The definitive version is available at www.blackwell-synergy.com|
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