Magellan/M2FS and MMT/Hectochelle Spectroscopy of Dwarf Galaxies and Faint Star Clusters within the Galactic Halo

Autor: Matthew G. Walker, Nelson Caldwell, Mario Mateo, Edward W. Olszewski, Andrew B. Pace, John I. Bailey III, Sergey E. Koposov, Ian U. Roederer

Publikováno v: The Astrophysical Journal Supplement Series, Vol 268, Iss 1, p 19 (2023)

We present spectroscopic data for 16,369 stellar targets within and/or toward 38 dwarf spheroidal galaxies and faint star clusters within the Milky Way halo environment. All spectra come from observations with the multiobject, fiber-fed echelle spect

Externí odkaz: https://doaj.org/article/ecca77af27fd4bb49ee878a43e2efbc1

Spectroscopic Analysis of Milky Way Outer Halo Satellites: Aquarius II and Boötes II

Autor: Jordan Bruce, Ting S. Li, Andrew B. Pace, Mairead Heiger, Ying-Yi Song, Joshua D. Simon

Publikováno v: The Astrophysical Journal, Vol 950, Iss 2, p 167 (2023)

In this paper, we present a chemical and kinematic analysis of two ultrafaint dwarf galaxies (UFDs), Aquarius II (Aqu II) and Boötes II (Boo II), using Magellan/IMACS spectroscopy. We present the largest sample of member stars for Boo II (12), and t

Externí odkaz: https://doaj.org/article/16df80dd259c4b649ad28f1a0156d6d7

Timing the r-process Enrichment of the Ultra-faint Dwarf Galaxy Reticulum II

Autor: Joshua D. Simon, Thomas M. Brown, Burçin Mutlu-Pakdil, Alexander P. Ji, Alex Drlica-Wagner, Roberto J. Avila, Clara E. Martínez-Vázquez, Ting S. Li, Eduardo Balbinot, Keith Bechtol, Anna Frebel, Marla Geha, Terese T. Hansen, David J. James, Andrew B. Pace, M. Aguena, O. Alves, F. Andrade-Oliveira, J. Annis, D. Bacon, E. Bertin, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, M. Costanzi, L. N. da Costa, J. De Vicente, S. Desai, P. Doel, S. Everett, I. Ferrero, J. Frieman, J. García-Bellido, M. Gatti, D. W. Gerdes, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, K. Kuehn, N. Kuropatkin, J. L. Marshall, J. Mena-Fernández, R. Miquel, A. Palmese, F. Paz-Chinchón, M. E. S. Pereira, A. Pieres, A. A. Plazas Malagón, M. Raveri, M. Rodriguez-Monroy, E. Sanchez, B. Santiago, V. Scarpine, I. Sevilla-Noarbe, M. Smith, E. Suchyta, M. E. C. Swanson, G. Tarle, C. To, M. Vincenzi, N. Weaverdyck, R. D. Wilkinson

Publikováno v: The Astrophysical Journal, Vol 944, Iss 1, p 43 (2023)

The ultra-faint dwarf galaxy Reticulum II (Ret II) exhibits a unique chemical evolution history, with ${72}_{-12}^{+10}$ % of its stars strongly enhanced in r -process elements. We present deep Hubble Space Telescope photometry of Ret II and analyze

Externí odkaz: https://doaj.org/article/dbc6ac7f8802402a8f17fb3f21479413

Streams on FIRE: Populations of Detectable Stellar Streams in the Milky Way and FIRE

Autor: Nora Shipp, Nondh Panithanpaisal, Lina Necib, Robyn Sanderson, Denis Erkal, Ting S. Li, Isaiah B. Santistevan, Andrew Wetzel, Lara R. Cullinane, Alexander P. Ji, Sergey E. Koposov, Kyler Kuehn, Geraint F. Lewis, Andrew B. Pace, Daniel B. Zucker, Joss Bland-Hawthorn, Emily C. Cunningham, Stacy Y. Kim, Sophia Lilleengen, Jorge Moreno, Sanjib Sharma

Publikováno v: Shipp, N, Panithanpaisal, N, Necib, L, Sanderson, R, Erkal, D, Li, T S, Santistevan, I B, Wetzel, A, Cullinane, L R, Ji, A P, Koposov, S E, Kuehn, K, Lewis, G F, Pace, A B, Zucker, D B, Bland-Hawthorn, J, Cunningham, E C, Kim, S Y, Lilleengen, S, Moreno, J & Sharma, S 2023, ' Streams on FIRE: Populations of Detectable Stellar Streams in the Milky Way and FIRE ', Astrophysical Journal, vol. 949, no. 2, 44, pp. 1-19 . https://doi.org/10.3847/1538-4357/acc582

We present the first detailed study comparing the populations of stellar streams in cosmological simulations to observed Milky Way dwarf galaxy streams. In particular, we compare streams identified around Milky Way analogs in the FIRE-2 simulations t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::933d3c26fef932e209b1dbd9d6f0695f

The southern stellar stream spectroscopic survey (S5)

Autor: Lara R. Cullinane, A. K. Vivas, E. Balbinot, Vasily Belokurov, Daniel B. Zucker, Sergey E. Koposov, Jeffrey D. Simpson, Sanjib Sharma, Alasdair Mackey, Denis Erkal, G. M. De Silva, Douglas L. Tucker, Risa H. Wechsler, J. D. Simon, Keith Bechtol, Kyler Kuehn, Alexander P. Ji, Geraint F. Lewis, Alex Drlica-Wagner, Brian Yanny, Marla Geha, Joss Bland-Hawthorn, Andrew B. Pace, S. Allam, Nora Shipp, G. S. Da Costa, Tenglin Li, Andrew R. Casey, Jeremy Mould, Zhen Wan, Yao-Yuan Mao, Sarah L. Martell

Publikováno v: Li, T S, Koposov, S E, Zucker, D B, Lewis, G F, Kuehn, K, Simpson, J D, Ji, A P, Shipp, N, Mao, Y-Y, Geha, M, Pace, A B, Mackey, A D, Allam, S, Tucker, D L, Da Costa, G S, Erkal, D, Simon, J D, Mould, J R, Martell, S L, Wan, Z, De Silva, G M, Bechtol, K, Balbinot, E, Belokurov, V, Bland-Hawthorn, J, Casey, A R, Cullinane, L, Drlica-Wagner, A, Sharma, S, Vivas, A K, Wechsler, R H & Yanny, B 2019, ' The southern stellar stream spectroscopic survey (S5): Overview, target selection, data reduction, validation, and early science ', Monthly Notices of the Royal Astronomical Society, vol. 490, no. 3, pp. 3508-3531 . https://doi.org/10.1093/mnras/stz2731
Monthly Notices of the Royal Astronomical Society, 490, 3508-3531. Oxford University Press

We introduce the Southern Stellar Stream Spectroscopy Survey (${S}^5$), an on-going program to map the kinematics and chemistry of stellar streams in the Southern Hemisphere. The initial focus of ${S}^5$ has been spectroscopic observations of recentl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::150d9f7a4181c386d03b8028b4acd8d2
https://doi.org/10.1093/mnras/stz2731