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arXiv:0706.1550 (astro-ph)
[Submitted on 11 Jun 2007]

Title:Galactic disc warps due to intergalactic accretion flows onto the disc

Authors:M. Lopez-Corredoira, J. Betancort-Rijo, J. E. Beckman
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Abstract: The accretion of the intergalactic medium onto the gaseous disc is used to explain the generation of galactic warps. A cup-shaped distortion is expected, due to the transmission of the linear momentum; but, this effect is small for most incident inflow angles and the predominant effect turns out to be the transmission of angular momentum, i.e. a torque giving an integral-sign shaped warp. The torque produced by a flow of velocity ~100 km/s and baryon density ~10^{-25} kg/m^3, which is within the possible values for the intergalactic medium, is enough to generate the observed warps and this mechanism offers quite a plausible explanation. The inferred rate of infall of matter, ~1 M_sun/yr, to the Galactic disc that this theory predicts agrees with the quantitative predictions of chemical evolution resolving key issues, notably the G-dwarf problem.
Sanchez-Salcedo (2006) suggests that this mechanism is not plausible because it would produce a dependence of the scaleheight of the disc with the Galactocentric azimuth in the outer disc, but rather than being an objection this is another argument in favour of the mechanism because this dependence is actually observed in our Galaxy.
Comments: 4 pages, 1 figure, to be published in: "Pathways through an eclectic Universe" (ASP Proc.; proceedings of the conference held at Tenerife, Spain on 23rd-27th April 2007), J. Knappen, T. J. Mahoney, A. Vazdekis (Eds.)
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.1550 [astro-ph]
  (or arXiv:0706.1550v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.1550

Submission history

From: Martin Lopez-Corredoira [view email]
[v1] Mon, 11 Jun 2007 19:27:15 UTC (12 KB)
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