A Tidally Induced Global Corrugation Pattern in an External Disk Galaxy Similar to the Milky Way

Gómez, Facundo A.; Torres-Flores, Sergio; Mora-Urrejola, Catalina; Monachesi, Antonela; White, Simon D.M.; Maffione, Nicolas P.; Grand, Robert J.J.; Marinacci, Federico; Pakmor, Rüdiger; Springel, Volker; Frenk, Carlos S.; Amram, Philippe; Epinat, Benoît; de Oliveira, Claudia Mendes

doi:10.3847/1538-4357/abcd97

A Tidally Induced Global Corrugation Pattern in an External Disk Galaxy Similar to the Milky Way

Gómez, Facundo A.; Torres-Flores, Sergio; Mora-Urrejola, Catalina; Monachesi, Antonela; White, Simon D.M.; Maffione, Nicolas P.; Grand, Robert J.J.; Marinacci, Federico; Pakmor, Rüdiger; Springel, Volker; Frenk, Carlos S.; Amram, Philippe; Epinat, Benoît; de Oliveira, Claudia Mendes

Authors

Facundo A. Gómez

Sergio Torres-Flores

Catalina Mora-Urrejola

Antonela Monachesi

Simon D.M. White

Nicolas P. Maffione

Robert J.J. Grand

Federico Marinacci

Rüdiger Pakmor

Volker Springel

Professor Carlos Frenk c.s.frenk@durham.ac.uk
Professor

Philippe Amram

Benoît Epinat

Claudia Mendes de Oliveira

Abstract

We study the two-dimensional (2D) line-of-sight velocity (Vlos) field of the low-inclination, late-type galaxy VV304a. The resulting 2D kinematic map reveals a global, coherent, and extended perturbation that is likely associated with a recent interaction with the massive companion VV304b. We use multiband imaging and a suite of test-particle simulations to quantify the plausible strength of in-plane flows due to nonaxisymmetric perturbations and show that the observed velocity flows are much too large to be driven either by a spiral structure or by a bar. We use fully cosmological hydrodynamical simulations to characterize the contribution from in- and off-plane velocity flows to the Vlos field of recently interacting galaxy pairs like the VV304 system. We show that, for recently perturbed low-inclination galactic disks, the structure of the residual velocity field, after subtraction of an axisymmetric rotation model, can be dominated by vertical flows. Our results indicate that the Vlos perturbations in VV304a are consistent with a corrugation pattern. Its Vlos map suggests the presence of a structure similar to the Monoceros ring seen in the Milky Way. Our study highlights the possibility of addressing important questions regarding the nature and origin of vertical perturbations by measuring the line-of-sight velocities in low-inclination nearby galaxies.

Citation

Gómez, F. A., Torres-Flores, S., Mora-Urrejola, C., Monachesi, A., White, S. D., Maffione, N. P., …de Oliveira, C. M. (2021). A Tidally Induced Global Corrugation Pattern in an External Disk Galaxy Similar to the Milky Way. Astrophysical Journal, 908(1), Article 27. https://doi.org/10.3847/1538-4357/abcd97

Journal Article Type	Article
Acceptance Date	Nov 23, 2020
Online Publication Date	Feb 9, 2021
Publication Date	Feb 10, 2021
Deposit Date	Jul 23, 2021
Publicly Available Date	Feb 9, 2022
Journal	Astrophysical Journal
Print ISSN	0004-637X
Electronic ISSN	1538-4357
Publisher	American Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	908
Issue	1
Article Number	27
DOI	https://doi.org/10.3847/1538-4357/abcd97
Related Public URLs	https://arxiv.org/abs/2011.12323

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Copyright Statement
This is the Accepted Manuscript version of an article accepted for publication in The Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.3847/1538-4357/abcd97.