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pro vyhledávání: '"Usman, Sam A"'
Autor:
Awad, Petra, Li, Ting S., Erkal, Denis, Peletier, Reynier F., Bunte, Kerstin, Koposov, Sergey E., Li, Andrew, Balbinot, Eduardo, Smith, Rory, Canducci, Marco, Tino, Peter, Senkevich, Alexandra M., Cullinane, Lara R., Da Costa, Gary S., Ji, Alexander P., Kuehn, Kyler, Lewis, Geraint F., Pace, Andrew B., Zucker, Daniel B., Bland-Hawthorn, Joss, Limberg, Guilherme, Martell, Sarah L., McKenzie, Madeleine, Yang, Yong, Usman, Sam A.
As globular clusters (GCs) orbit the Milky Way, their stars are tidally stripped forming tidal tails that follow the orbit of the clusters around the Galaxy. The morphology of these tails is complex and shows correlations with the phase of the orbit
Externí odkaz:
http://arxiv.org/abs/2411.08991
Autor:
Atzberger, Kaia R., Usman, Sam A., Ji, Alexander P., Cullinane, Lara R., Erkal, Denis, Hansen, Terese T., Lewis, Geraint F., Li, Ting S., Limberg, Guilherme, Luna, Alice, Martell, Sarah L., McKenzie, Madeleine, Pace, Andrew B., Zucker, Daniel B.
Chemical abundances of stellar streams can be used to determine the nature of a stream's progenitor. Here we study the progenitor of the recently discovered Leiptr stellar stream, which was previously suggested to be a tidally disrupted halo globular
Externí odkaz:
http://arxiv.org/abs/2410.17312
Autor:
Hilmi, Tariq, Erkal, Denis, Koposov, Sergey E., Li, Ting S., Lilleengen, Sophia, Ji, Alexander P., Lewis, Geraint F., Shipp, Nora, Pace, Andrew B., Zucker, Daniel B., Limberg, Guilherme, Usman, Sam A.
In the cold dark matter paradigm, our Galaxy is predicted to contain >10000 dark matter subhaloes in the $10^5-10^8M_\odot$ range which should be completely devoid of stars. Stellar streams are sensitive to the presence of these subhaloes, which can
Externí odkaz:
http://arxiv.org/abs/2404.02953
Autor:
Ji, Alexander P., Curtis, Sanjana, Storm, Nicholas, Chandra, Vedant, Schlaufman, Kevin C., Stassun, Keivan G., Heger, Alexander, Pignatari, Marco, Price-Whelan, Adrian M., Bergemann, Maria, Stringfellow, Guy S., Frohlich, Carla, Reggiani, Henrique, Holmbeck, Erika M., Tayar, Jamie, Shah, Shivani P., Griffith, Emily J., Laporte, Chervin F. P., Casey, Andrew R., Hawkins, Keith, Horta, Danny, Cerny, William, Thibodeaux, Pierre, Usman, Sam A., Amarante, Joao A. S., Beaton, Rachael L., Cargile, Phillip A., Chiappini, Cristina, Conroy, Charlie, Johnson, Jennifer A., Kollmeier, Juna A., Li, Haining, Loebman, Sarah, Meynet, Georges, Bizyaev, Dmitry, Brownstein, Joel R., Gupta, Pramod, Morrison, Sean, Pan, Kaike, Ramirez, Solange V., Rix, Hans-Walter, Sanchez-Gallego, Jose
Stars formed with initial mass over 50 Msun are very rare today, but they are thought to be more common in the early universe. The fates of those early, metal-poor, massive stars are highly uncertain. Most are expected to directly collapse to black h
Externí odkaz:
http://arxiv.org/abs/2401.02484
Autor:
Usman, Sam A., Ji, Alexander P., Li, Ting S., Pace, Andrew B., Cullinane, Lara R., Da Costa, Gary S., Koposov, Sergey E., Lewis, Geraint F., Zucker, Daniel B., Belokurov, Vasily, Bland-Hawthorn, Joss, Ferguson, Peter S., Hansen, Terese T., Limberg, Guilherme, Martell, Sarah L., McKenzie, Madeleine, Simon, Joshua D.
Milky Way globular clusters (GCs) display chemical enrichment in a phenomenon called multiple stellar populations (MSPs). While the enrichment mechanism is not fully understood, there is a correlation between a cluster's mass and the fraction of enri
Externí odkaz:
http://arxiv.org/abs/2401.02476
Autor:
Limberg, Guilherme, Ji, Alexander P., Naidu, Rohan P., Chiti, Anirudh, Rossi, Silvia, Usman, Sam A., Ting, Yuan-Sen, Zaritsky, Dennis, Bonaca, Ana, Borbolato, Lais, Speagle, Joshua S., Chandra, Vedant, Conroy, Charlie
We present the first detailed chemical-abundance analysis of stars from the dwarf-galaxy stellar stream Wukong/LMS-1 covering a wide metallicity range ($-3.5 < \rm[Fe/H] \lesssim -1.3$). We find abundance patterns that are effectively indistinguishab
Externí odkaz:
http://arxiv.org/abs/2308.13702
Akademický článek
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Autor:
Usman, Sam A, Ji, Alexander P, Li, Ting S, Pace, Andrew B, Cullinane, Lara R, Da Costa, Gary S, Koposov, Sergey E, Lewis, Geraint F, Zucker, Daniel B, Belokurov, Vasily, Bland-Hawthorn, Joss, Ferguson, Peter S, Hansen, Terese T, Limberg, Guilherme, Martell, Sarah L, McKenzie, Madeleine, Simon, Joshua D, Collaboration), (S5
Publikováno v:
Monthly Notices of the Royal Astronomical Society; Apr2024, Vol. 529 Issue 3, p2413-2427, 15p
