2014
DOI: 10.1093/mnras/stu396
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Abstract: We explore the hypothesis that a passing satellite or dark matter subhalo has excited coherent oscillations of the Milky Way's stellar disk in the direction perpendicular to the Galactic midplane. This work is motivated by recent observations of spatially dependent bulk vertical motions within ∼ 2 kpc of the Sun. A satellite can transfer a fraction of its orbital energy to the disk stars as it plunges through the Galactic midplane thereby heating and thickening the disk. Bulk motions arise during the early sta… Show more

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Cited by 142 publications
(197 citation statements)
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References 66 publications
(121 reference statements)
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“…As a satellite galaxy passes through the disk, it excites both bending and breathing modes (Widrow et al 2014). The former have been implicated in the generation of galactic warps.…”
Section: Discussionmentioning
confidence: 99%
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“…As a satellite galaxy passes through the disk, it excites both bending and breathing modes (Widrow et al 2014). The former have been implicated in the generation of galactic warps.…”
Section: Discussionmentioning
confidence: 99%
“…Our N-body system comprises self-gravitating, collisionless infinite sheets. We use a particle-mesh scheme in which the density is calculated on a one-dimensional grid and the force on a sheet at position z is determined from the integral Similar simulations were presented in Weinberg (1991); Widrow et al (2012) and Widrow et al (2014). We use initial conditions that correspond to a simple breathing mode by first setting up an equlibrium distribution and then perturbing the positions and velocities according to the relations z = λzze and v = λvve where (ze, ve) are the phase space coordinates of a particle in the unperturbed system and λe,v are constants.…”
Section: Simulationsmentioning
confidence: 99%
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“…These motions may be induced by external perturbations, such as a satellite galaxy, (e.g. Widrow et al 2014) or internal perturbations, such as spiral arms (e.g. Faure et al 2014).…”
Section: Determination Of Galactocentric Positions and Velocitiesmentioning
confidence: 99%