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. Martinez-Vazquez; 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; K. Honscheid; D. J. James; E. Krause; M. A. G. Maia; M. March; F. Menanteau; R. Miquel; R. L. C. Ogando; A. A. Plazas; E. Sanchez; B. Santiago; V. Scarpine; R. Schindler; I. Sevilla-Noarbe; M. Smith; R. C. Smith; M. Soares-Santos; F. Sobreira; E. Suchyta; M. E. C. Swanson; G. Tarle; D. L. Tucker; 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. Martinez-Vazquez, 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, K. Honscheid, D. J. James, E. Krause, M. A. G. Maia, M. March, F. Menanteau, R. Miquel, R. L. C. Ogando, A. A. Plazas, E. Sanchez, B. Santiago, V. Scarpine, R. Schindler, I. Sevilla-Noarbe, M. Smith, R. C. Smith, M. Soares-Santos, F. Sobreira, E. Suchyta, M. E. C. Swanson, G. Tarle, D. L. Tucker, A. R. Walker

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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. 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
Journal	Monthly Notices of the Royal Astronomical Society
Early online date	14 Sep 2018
DOIs	https://doi.org/10.1093/mnras/sty2518
Publication status	Published - 1 Dec 2018

Keywords

astro-ph.GA

Access to Document

10.1093/mnras/sty2518

1804.07762v1Accepted author manuscript, 694 KB

https://arxiv.org/abs/1804.07762

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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., Martinez-Vazquez, 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 . https://doi.org/10.1093/mnras/sty2518

@article{bd71cc7af0264736977df42a4bd97bab,

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. 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 = "astro-ph.GA",

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 Martinez-Vazquez, {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 Costa, {L. N. da} and C. Davis and Vicente, {J. De} 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 K. Honscheid and James, {D. J.} and E. Krause and Maia, {M. A. G.} and M. March and F. Menanteau and R. Miquel and Ogando, {R. L. C.} and Plazas, {A. A.} and E. Sanchez and B. Santiago and V. Scarpine and R. Schindler and I. Sevilla-Noarbe and M. Smith and Smith, {R. C.} and M. Soares-Santos and F. Sobreira and E. Suchyta and Swanson, {M. E. C.} and G. Tarle and Tucker, {D. L.} and Walker, {A. R.}",

note = "13 pages, 8 figures, submitted to MNRAS. Comments welcome! See also Li et al. {"}The First Tidally Disrupted Ultra-Faint Dwarf Galaxy? -- Spectroscopic Analysis of the Tucana III Stream{"} on today's astro-ph",

year = "2018",

month = dec,

day = "1",

doi = "10.1093/mnras/sty2518",

language = "English",

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

issn = "0035-8711",

publisher = "Oxford University Press",

}

Erkal, D, Li, TS, Koposov, SE, Belokurov, V, Balbinot, E, Bechtol, K, Buncher, B, Drlica-Wagner, A, Kuehn, K, Marshall, JL, Martinez-Vazquez, 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, Costa, LND, Davis, C, Vicente, JD, 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, Honscheid, K, James, DJ, Krause, E, Maia, MAG, March, M, Menanteau, F, Miquel, R, Ogando, RLC, Plazas, AA, Sanchez, E, Santiago, B, Scarpine, V, Schindler, R, Sevilla-Noarbe, I, Smith, M, Smith, RC, Soares-Santos, M, Sobreira, F, Suchyta, E, Swanson, MEC, Tarle, G, Tucker, DL & Walker, AR 2018, 'Modelling the Tucana III stream - a close passage with the LMC', Monthly Notices of the Royal Astronomical Society . 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 - Martinez-Vazquez, 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 - Costa, L. N. da

AU - Davis, C.

AU - Vicente, J. De

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 - Honscheid, K.

AU - James, D. J.

AU - Krause, E.

AU - Maia, M. A. G.

AU - March, M.

AU - Menanteau, F.

AU - Miquel, R.

AU - Ogando, R. L. C.

AU - Plazas, A. A.

AU - Sanchez, E.

AU - Santiago, B.

AU - Scarpine, V.

AU - Schindler, R.

AU - Sevilla-Noarbe, I.

AU - Smith, M.

AU - Smith, R. C.

AU - Soares-Santos, M.

AU - Sobreira, F.

AU - Suchyta, E.

AU - Swanson, M. E. C.

AU - Tarle, G.

AU - Tucker, D. L.

AU - Walker, A. R.

N1 - 13 pages, 8 figures, submitted to MNRAS. Comments welcome! See also Li et al. "The First Tidally Disrupted Ultra-Faint Dwarf Galaxy? -- Spectroscopic Analysis of the Tucana III Stream" on today's astro-ph

PY - 2018/12/1

Y1 - 2018/12/1

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. 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. 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 - astro-ph.GA

U2 - 10.1093/mnras/sty2518

DO - 10.1093/mnras/sty2518

M3 - Article

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

ER -

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

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Keywords

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