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

D. Erkal; T. S. Li; S. E. Koposov; V. Belokurov; E. Balbinot; K. Bechtol; B. Buncher; A. Drlica-Wagner; K. Kuehn; J. L. Marshall; C. E. Martínez-Vázquez; A. B. Pace; N. Shipp; J. D. Simon; K. M. Stringer; A. K. Vivas; R. H. Wechsler; B. Yanny; F. B. Abdalla; S. Allam; J. Annis; S. Avila; E. Bertin; D. Brooks; E. Buckley-Geer; D. L. Burke; A. Carnero Rosell; M. Carrasco Kind; J. Carretero; C. B. D'Andrea; L. N. da Costa; C. Davis; J. De Vicente; P. Doel; T. F. Eifler; A. E. Evrard; B. Flaugher; J. Frieman; J. García-Bellido; E. Gaztanaga; D. W. Gerdes; D. Gruen; R. A. Gruendl; J. Gschwend; G. Gutierrez; W. G. Hartley; D. L. Hollowood; M. Smith; R. C. Smith; A. R. Walker

doi:10.1093/mnras/sty2518

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

D. Erkal^*, T. S. Li, S. E. Koposov, V. Belokurov, E. Balbinot, K. Bechtol, B. Buncher, A. Drlica-Wagner, K. Kuehn, J. L. Marshall, C. E. Martínez-Vázquez, A. B. Pace, N. Shipp, J. D. Simon, K. M. Stringer, A. K. Vivas, R. H. Wechsler, B. Yanny, F. B. Abdalla, S. AllamJ. Annis, S. Avila, E. Bertin, D. Brooks, E. Buckley-Geer, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, C. B. D'Andrea, L. N. da Costa, C. Davis, J. De Vicente, P. Doel, T. F. Eifler, A. E. Evrard, B. Flaugher, J. Frieman, J. García-Bellido, E. Gaztanaga, D. W. Gerdes, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, W. G. Hartley, D. L. Hollowood, M. Smith, R. C. Smith, A. R. Walker

^*Corresponding author for this work

Institute of Cosmology & Gravitation

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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.

Original language	English
Pages (from-to)	3148-3159
Number of pages	12
Journal	Monthly Notices of the Royal Astronomical Society
Volume	481
Issue number	3
Early online date	14 Sept 2018
DOIs	https://doi.org/10.1093/mnras/sty2518
Publication status	Published - 11 Dec 2018

Keywords

Galaxies: dwarf
Galaxy: evolution
Galaxy: kinematics and dynamics
RCUK
STFC

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10.1093/mnras/sty2518

Modelling the Tucana III stream
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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Data availability statement for 'Modelling the Tucana III stream - a close passage with the LMC'.
Avila Perez, S. J. (Creator) & D'Andrea, C. B. (Creator), Oxford University Press, 11 Dec 2018
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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., ... 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. https://doi.org/10.1093/mnras/sty2518

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title = "Modelling the Tucana III stream - a close passage with the LMC",

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.",

keywords = "Galaxies: dwarf, Galaxy: evolution, Galaxy: kinematics and dynamics, RCUK, STFC",

author = "D. Erkal and Li, {T. S.} and Koposov, {S. E.} and V. Belokurov and E. Balbinot and K. Bechtol and B. Buncher and A. Drlica-Wagner and K. Kuehn and Marshall, {J. L.} and Mart{\'i}nez-V{\'a}zquez, {C. E.} and Pace, {A. B.} and N. Shipp and Simon, {J. D.} and Stringer, {K. M.} and Vivas, {A. K.} and Wechsler, {R. H.} and B. Yanny and Abdalla, {F. B.} and S. Allam and J. Annis and S. Avila and E. Bertin and D. Brooks and E. Buckley-Geer and Burke, {D. L.} and Rosell, {A. Carnero} and Kind, {M. Carrasco} and J. Carretero and D'Andrea, {C. B.} and {da Costa}, {L. N.} and C. Davis and {De Vicente}, J. and P. Doel and Eifler, {T. F.} and Evrard, {A. E.} and B. Flaugher and J. Frieman and J. Garc{\'i}a-Bellido and E. Gaztanaga and Gerdes, {D. W.} and D. Gruen and Gruendl, {R. A.} and J. Gschwend and G. Gutierrez and Hartley, {W. G.} and Hollowood, {D. L.} and M. Smith and Smith, {R. C.} and Walker, {A. R.}",

year = "2018",

month = dec,

day = "11",

doi = "10.1093/mnras/sty2518",

language = "English",

volume = "481",

pages = "3148--3159",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "3",

}

Erkal, D, Li, TS, Koposov, SE, Belokurov, V, Balbinot, E, Bechtol, K, Buncher, B, Drlica-Wagner, A, Kuehn, K, Marshall, JL, Martínez-Vázquez, CE, Pace, AB, Shipp, N, Simon, JD, Stringer, KM, Vivas, AK, Wechsler, RH, Yanny, B, Abdalla, FB, Allam, S, Annis, J, Avila, S, Bertin, E, Brooks, D, Buckley-Geer, E, Burke, DL, Rosell, AC, Kind, MC, Carretero, J, D'Andrea, CB, da Costa, LN, Davis, C, De Vicente, J, Doel, P, Eifler, TF, Evrard, AE, Flaugher, B, Frieman, J, García-Bellido, J, Gaztanaga, E, Gerdes, DW, Gruen, D, Gruendl, RA, Gschwend, J, Gutierrez, G, Hartley, WG, Hollowood, DL, Smith, M, Smith, RC & Walker, AR 2018, 'Modelling the Tucana III stream - a close passage with the LMC', Monthly Notices of the Royal Astronomical Society, vol. 481, no. 3, pp. 3148-3159. https://doi.org/10.1093/mnras/sty2518

TY - JOUR

T1 - Modelling the Tucana III stream - a close passage with the LMC

AU - Erkal, D.

AU - Li, T. S.

AU - Koposov, S. E.

AU - Belokurov, V.

AU - Balbinot, E.

AU - Bechtol, K.

AU - Buncher, B.

AU - Drlica-Wagner, A.

AU - Kuehn, K.

AU - Marshall, J. L.

AU - Martínez-Vázquez, C. E.

AU - Pace, A. B.

AU - Shipp, N.

AU - Simon, J. D.

AU - Stringer, K. M.

AU - Vivas, A. K.

AU - Wechsler, R. H.

AU - Yanny, B.

AU - Abdalla, F. B.

AU - Allam, S.

AU - Annis, J.

AU - Avila, S.

AU - Bertin, E.

AU - Brooks, D.

AU - Buckley-Geer, E.

AU - Burke, D. L.

AU - Rosell, A. Carnero

AU - Kind, M. Carrasco

AU - Carretero, J.

AU - D'Andrea, C. B.

AU - da Costa, L. N.

AU - Davis, C.

AU - De Vicente, J.

AU - Doel, P.

AU - Eifler, T. F.

AU - Evrard, A. E.

AU - Flaugher, B.

AU - Frieman, J.

AU - García-Bellido, J.

AU - Gaztanaga, E.

AU - Gerdes, D. W.

AU - Gruen, D.

AU - Gruendl, R. A.

AU - Gschwend, J.

AU - Gutierrez, G.

AU - Hartley, W. G.

AU - Hollowood, D. L.

AU - Smith, M.

AU - Smith, R. C.

AU - Walker, A. R.

PY - 2018/12/11

Y1 - 2018/12/11

N2 - 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.

AB - 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.

KW - Galaxies: dwarf

KW - Galaxy: evolution

KW - Galaxy: kinematics and dynamics

KW - RCUK

KW - STFC

UR - http://www.scopus.com/inward/record.url?scp=85054220967&partnerID=8YFLogxK

U2 - 10.1093/mnras/sty2518

DO - 10.1093/mnras/sty2518

M3 - Article

AN - SCOPUS:85054220967

SN - 0035-8711

VL - 481

SP - 3148

EP - 3159

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

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

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Data availability statement for 'Modelling the Tucana III stream - a close passage with the LMC'.

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