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  A tidally induced global corrugation pattern in an external disc galaxy similar to the Milky Way

Gómez, F. A., Torres-Flores, S., Mora-Urrejola, C., Monachesi, A., White, S. D. M., Maffione, N. P., et al. (2021). A tidally induced global corrugation pattern in an external disc galaxy similar to the Milky Way. The Astrophysical Journal, 908(1): 27. doi:10.3847/1538-4357/abcd97.

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Gómez, Facundo A., Author
Torres-Flores, Sergio, Author
Mora-Urrejola, Catalina, Author
Monachesi, Antonela, Author
White, Simon D. M.1, Author           
Maffione, Nicolas P., Author
Grand, Robert J. J.2, Author           
Marinacci, Federico, Author
Pakmor, Rüdiger, Author
Springel, Volker1, Author           
Frenk, Carlos S., Author
Amram, Philippe, Author
Epinat, Benoît, Author
de Oliveira, Claudia Mendes, Author
Affiliations:
1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              
2Galaxy Formation, Cosmology, MPI for Astrophysics, Max Planck Society, ou_159878              

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 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.

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 Dates: 2021-02-09
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/abcd97
Other: LOCALID: 3292610
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 908 (1) Sequence Number: 27 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3