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Adaptive mesh refinement simulations of collisional ring galaxies: effects of the interaction geometry


Fiacconi, Davide; Mapelli, Michela; Ripamonti, Emanuele; Colpi, Monica (2012). Adaptive mesh refinement simulations of collisional ring galaxies: effects of the interaction geometry. Monthly Notices of the Royal Astronomical Society, 425(3):2255-2266.

Abstract

Collisional ring galaxies are the outcome of nearly axisymmetric high-speed encounters between a disc and an intruder galaxy. We investigate the properties of collisional ring galaxies as a function of the impact parameter, the initial relative velocity and the inclination angle. We employ new adaptive mesh refinement simulations to trace the evolution with time of both stars and gas, taking into account star formation and supernova feedback. Axisymmetric encounters produce circular primary rings followed by smaller secondary rings, while off-centre interactions produce asymmetric rings with displaced nuclei. We propose an analytical treatment of the disc warping induced by an inclination angle greater than zero. The star formation history of our models is mainly influenced by the impact parameter: axisymmetric collisions induce impulsive short-lived starburst episodes, whereas off-centre encounters produce long-lived star formation. We compute synthetic colour maps of our models and we find that rings have a B - V colour typically ˜0.2 mag bluer than the inner and outer disc, in agreement with observations.

Collisional ring galaxies are the outcome of nearly axisymmetric high-speed encounters between a disc and an intruder galaxy. We investigate the properties of collisional ring galaxies as a function of the impact parameter, the initial relative velocity and the inclination angle. We employ new adaptive mesh refinement simulations to trace the evolution with time of both stars and gas, taking into account star formation and supernova feedback. Axisymmetric encounters produce circular primary rings followed by smaller secondary rings, while off-centre interactions produce asymmetric rings with displaced nuclei. We propose an analytical treatment of the disc warping induced by an inclination angle greater than zero. The star formation history of our models is mainly influenced by the impact parameter: axisymmetric collisions induce impulsive short-lived starburst episodes, whereas off-centre encounters produce long-lived star formation. We compute synthetic colour maps of our models and we find that rings have a B - V colour typically ˜0.2 mag bluer than the inner and outer disc, in agreement with observations.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:September 2012
Deposited On:23 Jan 2013 12:26
Last Modified:05 Apr 2016 16:19
Publisher:Wiley-Blackwell
ISSN:0035-8711
Publisher DOI:https://doi.org/10.1111/j.1365-2966.2012.21566.x
Permanent URL: https://doi.org/10.5167/uzh-70443

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