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.

Fiacconi, D., Mapelli, M., Ripamonti, E., Colpi, M. (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 [10.1111/j.1365-2966.2012.21566.x].

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

RIPAMONTI, EMANUELE;COLPI, MONICA
2012

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.
Articolo in rivista - Articolo scientifico
galaxies: interactions; galaxies: peculiar; galaxies: star formation
English
set-2012
425
3
2255
2266
none
Fiacconi, D., Mapelli, M., Ripamonti, E., Colpi, M. (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 [10.1111/j.1365-2966.2012.21566.x].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/37900
Citazioni
  • Scopus 18
  • ???jsp.display-item.citation.isi??? 19
Social impact