2017
DOI: 10.1093/mnras/stx2165
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Abstract: We study the spontaneous generation and evolution of bending waves in N-body simulations of two isolated Milky Way-like galaxy models. The models differ by their disc-to-halo mass ratios, and hence by their susceptibility to the formation of a bar and spiral structure. Seeded from shot noise in the particle distribution, bending waves rapidly form in both models and persist for many billions of years. Waves at intermediate radii manifest as corrugated structures in vertical position and velocity that are tight… Show more

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Cited by 34 publications
(37 citation statements)
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“…The correlation between bulk vertical motion and midplane displacement in simulations has been discussed by Gómez et al (2013), Gómez et al (2016), Chequers & Widrow (2017), and Gómez et al (2017). In both of our control and satellite simulations the bulk vertical motions follow the same general patterns as the displacements (c.f.…”
Section: Correlation Between Z and V Zsupporting
confidence: 68%
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“…The correlation between bulk vertical motion and midplane displacement in simulations has been discussed by Gómez et al (2013), Gómez et al (2016), Chequers & Widrow (2017), and Gómez et al (2017). In both of our control and satellite simulations the bulk vertical motions follow the same general patterns as the displacements (c.f.…”
Section: Correlation Between Z and V Zsupporting
confidence: 68%
“…Our view is that immediately after the disc encounters a satellite the resulting vertical perturbation may well evolve kinematically, but that once sheared into an extended arc, it will behave as a self-gravitating wave. This picture is supported by the good agreement between the results from linear perturbation theory, which includes self-gravity (Hunter & Toomre 1969;Sparke 1984;Sparke & Casertano 1988;Nelson & Tremaine 1995), and simulations (Chequers & Widrow 2017). Eventually, the energy imparted to the disc by a passing subhalo or satellite is converted into random motions of the disc stars thereby vertically heating the disc (Lacey & Ostriker 1985;Toth & Ostriker 1992;Sellwood et al 1998).…”
Section: Introductionmentioning
confidence: 62%
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“…Further evidence for bending and breathing modes has been seen in both number counts and bulk motions of Solar Neighbourhood stars (see, for example, Widrow et al (2012); Williams et al (2013); Carlin et al (2013); Yanny & Gardner (2013); Gaia Collaboration et al (2018a); Bennett & Bovy (2018)). They can be excited by a passing satellite (Widrow et al 2012;Feldmann & Spolyar 2015;Gómez et al 2013Gómez et al , 2017, spiral structure or the bar (Debattista 2014;Monari et al 2015), or even shot noise in an N-body simulation (Chequers & Widrow 2017).…”
Section: Introductionmentioning
confidence: 99%