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A tidally induced global corrugation pattern in an external disk galaxy similar to the milky way

Gómez, FA, Torres-Flores, S, Mora-Urrejola, C, Monachesi, A, White, SDM, Maffione, NP, Grand, RJJ, Marinacci, F, Pakmor, R, Springel, V, Frenk, CS, Amram, P, Epinat, B and De Oliveira, CM (2021) A tidally induced global corrugation pattern in an external disk galaxy similar to the milky way. Astrophysical Journal, 908 (1). ISSN 0004-637X

A Tidally Induced Global Corrugation Pattern in an External Disk Galaxy Similar to the Milky Way.pdf - Accepted Version

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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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences; 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics; 0306 Physical Chemistry (incl. Structural); Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
SWORD Depositor: A Symplectic
Date Deposited: 16 Mar 2023 14:53
Last Modified: 16 Mar 2023 15:00
DOI or ID number: 10.3847/1538-4357/abcd97
URI: https://researchonline.ljmu.ac.uk/id/eprint/19122
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