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2019MNRAS.486.2020D - Mon. Not. R. Astron. Soc., 486, 2020-2031 (2019/June-3)

Lopsided gas discs arising from mass inflow in barred spiral galaxies.


Abstract (from CDS):

We explore numerically the effects of mass inflow on barred spiral galaxies in the context of high-velocity clouds accreting on to galactic discs. To assess whether such events are detectable, we quantify their effect on the disc's gas distribution by calculating the lopsidedness parameter A1, and by deriving position-velocity plots of H I emission. The impact of an accretion event strongly depends on the parameters of the high-velocity cloud. For cloud mass >=107 M, infall can have a lasting impact on the gaseous disc, with A1 >= 0.05 for ∼1.5 Gyr. We discuss the time-variability of the lopsidedness parameter and consequences for detecting gas infall. Accretion events will be marginally noticeable in position-velocity diagrams, again depending on cloud parameters. Our models provide a possible explanation for low-amplitude lopsidedness observed in galaxies without nearby companions.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): methods: numerical - hydrodynamics - galaxies: spiral - galaxies: evolution

Simbad objects: 4

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