Chemical Abundance Analysis of Tucana III, the Second r-process Enhanced Ultra-faint Dwarf Galaxy This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.

J. L. Marshall; T. Hansen; J. D. Simon; T. S. Li; R. A. Bernstein; K. Kuehn; A. B. Pace; D. L. Depoy; A. Palmese; A. Pieres; L. Strigari; A. Drlica-Wagner; K. Bechtol; C. Lidman; D. Q. Nagasawa; E. Bertin; D. Brooks; E. Buckley-Geer; D. L. Burke; A. Carnero Rosell; M. Carrasco Kind; J. Carretero; C. E. Cunha; C. B. D'Andrea; L. N.Da Costa; J. De Vicente; S. Desai; P. Doel; T. F. Eifler; B. Flaugher; P. Fosalba; J. Frieman; J. Garciá-Bellido; E. Gaztanaga; D. W. Gerdes; R. A. Gruendl; J. Gschwend; G. Gutierrez; W. G. Hartley; D. L. Hollowood; K. Honscheid; B. Hoyle; D. J. James; N. Kuropatkin; M. A.G. Maia; F. Menanteau; C. J. Miller; R. Miquel; A. A. Plazas; E. Sanchez; B. Santiago; V. Scarpine; M. Schubnell; S. Serrano; I. Sevilla-Noarbe; M. Smith; M. Soares-Santos; E. Suchyta; M. E.C. Swanson; G. Tarle; W. Wester

doi:10.3847/1538-4357/ab3653

Chemical Abundance Analysis of Tucana III, the Second r-process Enhanced Ultra-faint Dwarf Galaxy This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.

J. L. Marshall, T. Hansen, J. D. Simon, T. S. Li, R. A. Bernstein, K. Kuehn, A. B. Pace, D. L. Depoy, A. Palmese, A. Pieres, L. Strigari, A. Drlica-Wagner, K. Bechtol, C. Lidman, D. Q. Nagasawa, E. Bertin, D. Brooks, E. Buckley-Geer, D. L. Burke, A. Carnero RosellM. Carrasco Kind, J. Carretero, C. E. Cunha, C. B. D'Andrea, L. N.Da Costa, J. De Vicente, S. Desai, P. Doel, T. F. Eifler, B. Flaugher, P. Fosalba, J. Frieman, J. Garciá-Bellido, E. Gaztanaga, D. W. Gerdes, R. A. Gruendl, J. Gschwend, G. Gutierrez, W. G. Hartley, D. L. Hollowood, K. Honscheid, B. Hoyle, D. J. James, N. Kuropatkin, M. A.G. Maia, F. Menanteau, C. J. Miller, R. Miquel, A. A. Plazas, E. Sanchez, B. Santiago, V. Scarpine, M. Schubnell, S. Serrano, I. Sevilla-Noarbe, M. Smith, M. Soares-Santos, E. Suchyta, M. E.C. Swanson, G. Tarle, W. Wester

Department of Morphological Sciences

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Abstract

© 2019. The American Astronomical Society. All rights reserved.. We present a chemical abundance analysis of four additional confirmed member stars of Tucana III, a Milky Way satellite galaxy candidate in the process of being tidally disrupted as it is accreted by the Galaxy. Two of these stars are centrally located in the core of the galaxy while the other two stars are located in the eastern and western tidal tails. The four stars have chemical abundance patterns consistent with the one previously studied star in Tucana III: They are moderately enhanced in r-process elements, i.e., they have dex. The non-neutron-capture elements generally follow trends seen in other dwarf galaxies, including a metallicity range of 0.44 dex and the expected trend in -elements, i.e., the lower metallicity stars have higher Ca and Ti abundances. Overall, the chemical abundance patterns of these stars suggest that Tucana III was an ultra-faint dwarf galaxy, and not a globular cluster, before being tidally disturbed. As is the case for the one other galaxy dominated by r-process enhanced stars, Reticulum II, Tucana III's stellar chemical abundances are consistent with pollution from ejecta produced by a binary neutron star merger, although a different r-process element or dilution gas mass is required to explain the abundances in these two galaxies if a neutron star merger is the sole source of r-process enhancement.

Original language	English
Article number	177
Journal	Astrophysical Journal
Volume	882
DOIs	https://doi.org/10.3847/1538-4357/ab3653
Publication status	Published - 10 Sept 2019

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Marshall, J. L., Hansen, T., Simon, J. D., Li, T. S., Bernstein, R. A., Kuehn, K., Pace, A. B., Depoy, D. L., Palmese, A., Pieres, A., Strigari, L., Drlica-Wagner, A., Bechtol, K., Lidman, C., Nagasawa, D. Q., Bertin, E., Brooks, D., Buckley-Geer, E., Burke, D. L., ... Wester, W. (2019). Chemical Abundance Analysis of Tucana III, the Second r-process Enhanced Ultra-faint Dwarf Galaxy This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. Astrophysical Journal, 882, [177]. https://doi.org/10.3847/1538-4357/ab3653

@article{1cf1f0950c3a422fa951545919de553e,

title = "Chemical Abundance Analysis of Tucana III, the Second r-process Enhanced Ultra-faint Dwarf Galaxy This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.",

abstract = "{\textcopyright} 2019. The American Astronomical Society. All rights reserved.. We present a chemical abundance analysis of four additional confirmed member stars of Tucana III, a Milky Way satellite galaxy candidate in the process of being tidally disrupted as it is accreted by the Galaxy. Two of these stars are centrally located in the core of the galaxy while the other two stars are located in the eastern and western tidal tails. The four stars have chemical abundance patterns consistent with the one previously studied star in Tucana III: They are moderately enhanced in r-process elements, i.e., they have dex. The non-neutron-capture elements generally follow trends seen in other dwarf galaxies, including a metallicity range of 0.44 dex and the expected trend in -elements, i.e., the lower metallicity stars have higher Ca and Ti abundances. Overall, the chemical abundance patterns of these stars suggest that Tucana III was an ultra-faint dwarf galaxy, and not a globular cluster, before being tidally disturbed. As is the case for the one other galaxy dominated by r-process enhanced stars, Reticulum II, Tucana III's stellar chemical abundances are consistent with pollution from ejecta produced by a binary neutron star merger, although a different r-process element or dilution gas mass is required to explain the abundances in these two galaxies if a neutron star merger is the sole source of r-process enhancement.",

author = "Marshall, {J. L.} and T. Hansen and Simon, {J. D.} and Li, {T. S.} and Bernstein, {R. A.} and K. Kuehn and Pace, {A. B.} and Depoy, {D. L.} and A. Palmese and A. Pieres and L. Strigari and A. Drlica-Wagner and K. Bechtol and C. Lidman and Nagasawa, {D. Q.} 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 Cunha, {C. E.} and D'Andrea, {C. B.} and Costa, {L. N.Da} and Vicente, {J. De} and S. Desai and P. Doel and Eifler, {T. F.} and B. Flaugher and P. Fosalba and J. Frieman and J. Garci{\'a}-Bellido and E. Gaztanaga and Gerdes, {D. W.} and Gruendl, {R. A.} and J. Gschwend and G. Gutierrez and Hartley, {W. G.} and Hollowood, {D. L.} and K. Honscheid and B. Hoyle and James, {D. J.} and N. Kuropatkin and Maia, {M. A.G.} and F. Menanteau and Miller, {C. J.} and R. Miquel and Plazas, {A. A.} and E. Sanchez and B. Santiago and V. Scarpine and M. Schubnell and S. Serrano and I. Sevilla-Noarbe and M. Smith and M. Soares-Santos and E. Suchyta and Swanson, {M. E.C.} and G. Tarle and W. Wester",

year = "2019",

month = sep,

day = "10",

doi = "10.3847/1538-4357/ab3653",

language = "English",

volume = "882",

journal = "Astrophysical Journal",

issn = "0004-637X",

}

Marshall, JL, Hansen, T, Simon, JD, Li, TS, Bernstein, RA, Kuehn, K, Pace, AB, Depoy, DL, Palmese, A, Pieres, A, Strigari, L, Drlica-Wagner, A, Bechtol, K, Lidman, C, Nagasawa, DQ, Bertin, E, Brooks, D, Buckley-Geer, E, Burke, DL, Rosell, AC, Kind, MC, Carretero, J, Cunha, CE, D'Andrea, CB, Costa, LND, Vicente, JD, Desai, S, Doel, P, Eifler, TF, Flaugher, B, Fosalba, P, Frieman, J, Garciá-Bellido, J, Gaztanaga, E, Gerdes, DW, Gruendl, RA, Gschwend, J, Gutierrez, G, Hartley, WG, Hollowood, DL, Honscheid, K, Hoyle, B, James, DJ, Kuropatkin, N, Maia, MAG, Menanteau, F, Miller, CJ, Miquel, R, Plazas, AA, Sanchez, E, Santiago, B, Scarpine, V, Schubnell, M, Serrano, S, Sevilla-Noarbe, I, Smith, M, Soares-Santos, M, Suchyta, E, Swanson, MEC, Tarle, G & Wester, W 2019, 'Chemical Abundance Analysis of Tucana III, the Second r-process Enhanced Ultra-faint Dwarf Galaxy This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.', Astrophysical Journal, vol. 882, 177. https://doi.org/10.3847/1538-4357/ab3653

Chemical Abundance Analysis of Tucana III, the Second r-process Enhanced Ultra-faint Dwarf Galaxy This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. / Marshall, J. L.; Hansen, T.; Simon, J. D. et al.

In: Astrophysical Journal, Vol. 882, 177, 10.09.2019.

Research output: Contribution to journal › Article › Research

TY - JOUR

T1 - Chemical Abundance Analysis of Tucana III, the Second r-process Enhanced Ultra-faint Dwarf Galaxy This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.

AU - Marshall, J. L.

AU - Hansen, T.

AU - Simon, J. D.

AU - Li, T. S.

AU - Bernstein, R. A.

AU - Kuehn, K.

AU - Pace, A. B.

AU - Depoy, D. L.

AU - Palmese, A.

AU - Pieres, A.

AU - Strigari, L.

AU - Drlica-Wagner, A.

AU - Bechtol, K.

AU - Lidman, C.

AU - Nagasawa, D. Q.

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 - Cunha, C. E.

AU - D'Andrea, C. B.

AU - Costa, L. N.Da

AU - Vicente, J. De

AU - Desai, S.

AU - Doel, P.

AU - Eifler, T. F.

AU - Flaugher, B.

AU - Fosalba, P.

AU - Frieman, J.

AU - Garciá-Bellido, J.

AU - Gaztanaga, E.

AU - Gerdes, D. W.

AU - Gruendl, R. A.

AU - Gschwend, J.

AU - Gutierrez, G.

AU - Hartley, W. G.

AU - Hollowood, D. L.

AU - Honscheid, K.

AU - Hoyle, B.

AU - James, D. J.

AU - Kuropatkin, N.

AU - Maia, M. A.G.

AU - Menanteau, F.

AU - Miller, C. J.

AU - Miquel, R.

AU - Plazas, A. A.

AU - Sanchez, E.

AU - Santiago, B.

AU - Scarpine, V.

AU - Schubnell, M.

AU - Serrano, S.

AU - Sevilla-Noarbe, I.

AU - Smith, M.

AU - Soares-Santos, M.

AU - Suchyta, E.

AU - Swanson, M. E.C.

AU - Tarle, G.

AU - Wester, W.

PY - 2019/9/10

Y1 - 2019/9/10

N2 - © 2019. The American Astronomical Society. All rights reserved.. We present a chemical abundance analysis of four additional confirmed member stars of Tucana III, a Milky Way satellite galaxy candidate in the process of being tidally disrupted as it is accreted by the Galaxy. Two of these stars are centrally located in the core of the galaxy while the other two stars are located in the eastern and western tidal tails. The four stars have chemical abundance patterns consistent with the one previously studied star in Tucana III: They are moderately enhanced in r-process elements, i.e., they have dex. The non-neutron-capture elements generally follow trends seen in other dwarf galaxies, including a metallicity range of 0.44 dex and the expected trend in -elements, i.e., the lower metallicity stars have higher Ca and Ti abundances. Overall, the chemical abundance patterns of these stars suggest that Tucana III was an ultra-faint dwarf galaxy, and not a globular cluster, before being tidally disturbed. As is the case for the one other galaxy dominated by r-process enhanced stars, Reticulum II, Tucana III's stellar chemical abundances are consistent with pollution from ejecta produced by a binary neutron star merger, although a different r-process element or dilution gas mass is required to explain the abundances in these two galaxies if a neutron star merger is the sole source of r-process enhancement.

AB - © 2019. The American Astronomical Society. All rights reserved.. We present a chemical abundance analysis of four additional confirmed member stars of Tucana III, a Milky Way satellite galaxy candidate in the process of being tidally disrupted as it is accreted by the Galaxy. Two of these stars are centrally located in the core of the galaxy while the other two stars are located in the eastern and western tidal tails. The four stars have chemical abundance patterns consistent with the one previously studied star in Tucana III: They are moderately enhanced in r-process elements, i.e., they have dex. The non-neutron-capture elements generally follow trends seen in other dwarf galaxies, including a metallicity range of 0.44 dex and the expected trend in -elements, i.e., the lower metallicity stars have higher Ca and Ti abundances. Overall, the chemical abundance patterns of these stars suggest that Tucana III was an ultra-faint dwarf galaxy, and not a globular cluster, before being tidally disturbed. As is the case for the one other galaxy dominated by r-process enhanced stars, Reticulum II, Tucana III's stellar chemical abundances are consistent with pollution from ejecta produced by a binary neutron star merger, although a different r-process element or dilution gas mass is required to explain the abundances in these two galaxies if a neutron star merger is the sole source of r-process enhancement.

U2 - 10.3847/1538-4357/ab3653

DO - 10.3847/1538-4357/ab3653

M3 - Article

SN - 0004-637X

VL - 882

JO - Astrophysical Journal

JF - Astrophysical Journal

M1 - 177

ER -