Fulltext

Lopsided galaxies: the case of NGC 891

Mapelli, M. ; Moore, B. ; Bland-Hawthorn, J.

In: Monthly Notices of the Royal Astronomical Society, 2008, vol. 388, no. 2, p. 697-708

Aggiungi alla tua lista
    Titre
    • Lopsided galaxies: the case of NGC 891
    Auteur
    • Mapelli, M.. Institute for Theoretical Physics, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
    • Moore, B.. Institute for Theoretical Physics, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
    • Bland-Hawthorn, J.. Institute of Astronomy, School of Physics, University of Sydney, Australia
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2008, vol. 388, no. 2, p. 697-708. Blackwell Publishing Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:304079
    Summary
    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