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Modelling the Tucana III stream - a close passage with the LMC

Modelling the Tucana III stream - a close passage with the LMC
Modelling the Tucana III stream - a close passage with the LMC

We present results of the first dynamical stream fits to the recently discovered Tucana III stream. These fits assume a fixed Milky Way potential and give proper motion predictions, which can be tested with the upcoming Gaia Data Release 2 (DR2). These fits reveal that Tucana III is on an eccentric orbit around the Milky Way and, more interestingly, that Tucana III passed within 15 kpc of the Large Magellanic Cloud (LMC) approximately 75 Myr ago. Given this close passage, we fit the Tucana III stream in the combined presence of the Milky Way and the LMC. We find that the predicted proper motions depend on the assumed mass of the LMC and that the LMC can induce a substantial proper motion perpendicular to the stream track. A detection of this misalignment will directly probe the extent of the LMC's influence on our Galaxy, and has implications for nearly all methods which attempt to constraint the Milky Way potential. Such a measurement will be possible with the upcoming Gaia DR2, allowing for a measurement of the LMC's mass.

Galaxies: dwarf, Galaxy: evolution, Galaxy: kinematics and dynamics
0035-8711
3148-3159
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Li, T. S.
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Erkal, D., Li, T. S., Koposov, S. E., Belokurov, V., Balbinot, E., Bechtol, K., Buncher, B., Drlica-Wagner, A., Kuehn, K., Marshall, J. L., Martínez-Vázquez, C. E., Pace, A. B., Shipp, N., Simon, J. D., Stringer, K. M., Vivas, A. K., Wechsler, R. H., Yanny, B., Abdalla, F. B., Allam, S., Annis, J., Avila, S., Bertin, E., Brooks, D., Buckley-Geer, E., Burke, D. L., Rosell, A. Carnero, Kind, M. Carrasco, Carretero, J., D'Andrea, C. B., da Costa, L. N., Davis, C., De Vicente, J., Doel, P., Eifler, T. F., Evrard, A. E., Flaugher, B., Frieman, J., García-Bellido, J., Gaztanaga, E., Gerdes, D. W., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hartley, W. G., Hollowood, D. L., Honscheid, K., James, D. J., Krause, E., Maia, M. A.G., March, M., Menanteau, F., Miquel, R., Ogando, R. L.C., Plazas, A. A., Sanchez, E., Santiago, B., Scarpine, V., Schindler, R., Sevilla-Noarbe, I., Smith, M., Smith, R. C., Soares-Santos, M., Sobreira, F., Suchyta, E., Swanson, M. E.C., Tarle, G., Tucker, D. L. and Walker, A. R. (2018) Modelling the Tucana III stream - a close passage with the LMC. Monthly Notices of the Royal Astronomical Society, 481 (3), 3148-3159. (doi:10.1093/mnras/sty2518).

Record type: Article

Abstract

We present results of the first dynamical stream fits to the recently discovered Tucana III stream. These fits assume a fixed Milky Way potential and give proper motion predictions, which can be tested with the upcoming Gaia Data Release 2 (DR2). These fits reveal that Tucana III is on an eccentric orbit around the Milky Way and, more interestingly, that Tucana III passed within 15 kpc of the Large Magellanic Cloud (LMC) approximately 75 Myr ago. Given this close passage, we fit the Tucana III stream in the combined presence of the Milky Way and the LMC. We find that the predicted proper motions depend on the assumed mass of the LMC and that the LMC can induce a substantial proper motion perpendicular to the stream track. A detection of this misalignment will directly probe the extent of the LMC's influence on our Galaxy, and has implications for nearly all methods which attempt to constraint the Milky Way potential. Such a measurement will be possible with the upcoming Gaia DR2, allowing for a measurement of the LMC's mass.

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Accepted/In Press date: 10 September 2018
e-pub ahead of print date: 14 September 2018
Published date: 11 December 2018
Keywords: Galaxies: dwarf, Galaxy: evolution, Galaxy: kinematics and dynamics

Identifiers

Local EPrints ID: 426899
URI: https://eprints.soton.ac.uk/id/eprint/426899
ISSN: 0035-8711
PURE UUID: af78e186-4183-4407-9d0c-9938e128cf2a
ORCID for M. Smith: ORCID iD orcid.org/0000-0002-3321-1432

Catalogue record

Date deposited: 14 Dec 2018 17:30
Last modified: 17 May 2019 00:30

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Contributors

Author: D. Erkal
Author: T. S. Li
Author: S. E. Koposov
Author: V. Belokurov
Author: E. Balbinot
Author: K. Bechtol
Author: B. Buncher
Author: A. Drlica-Wagner
Author: K. Kuehn
Author: J. L. Marshall
Author: C. E. Martínez-Vázquez
Author: A. B. Pace
Author: N. Shipp
Author: J. D. Simon
Author: K. M. Stringer
Author: A. K. Vivas
Author: R. H. Wechsler
Author: B. Yanny
Author: F. B. Abdalla
Author: S. Allam
Author: J. Annis
Author: S. Avila
Author: E. Bertin
Author: D. Brooks
Author: E. Buckley-Geer
Author: D. L. Burke
Author: A. Carnero Rosell
Author: M. Carrasco Kind
Author: J. Carretero
Author: C. B. D'Andrea
Author: L. N. da Costa
Author: C. Davis
Author: J. De Vicente
Author: P. Doel
Author: T. F. Eifler
Author: A. E. Evrard
Author: B. Flaugher
Author: J. Frieman
Author: J. García-Bellido
Author: E. Gaztanaga
Author: D. W. Gerdes
Author: D. Gruen
Author: R. A. Gruendl
Author: J. Gschwend
Author: G. Gutierrez
Author: W. G. Hartley
Author: D. L. Hollowood
Author: K. Honscheid
Author: D. J. James
Author: E. Krause
Author: M. A.G. Maia
Author: M. March
Author: F. Menanteau
Author: R. Miquel
Author: R. L.C. Ogando
Author: A. A. Plazas
Author: E. Sanchez
Author: B. Santiago
Author: V. Scarpine
Author: R. Schindler
Author: I. Sevilla-Noarbe
Author: M. Smith ORCID iD
Author: R. C. Smith
Author: M. Soares-Santos
Author: F. Sobreira
Author: E. Suchyta
Author: M. E.C. Swanson
Author: G. Tarle
Author: D. L. Tucker
Author: A. R. Walker

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