Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Queiroz, Anna B. A."'
Autor:
Canossa-Gosteinski, Marco A., Chies-Santos, Ana L., Furlanetto, Cristina, Bonatto, Charles J., Flores-Freitas, Rodrigo, Schoenell, William, Beasley, Michael A., Overzier, Roderik, Santiago, Basilio X., Pieres, Adriano, Zanatta, Emílio J. B., Alamo-Martinez, Karla A., Balbinot, Eduardo, Queiroz, Anna B. A., Alves-Brito, Alan
Understanding faint dwarf galaxies is fundamental to the development of a robust theory of galaxy formation on small scales. Since the discovery of a population of ultra diffuse galaxies (UDGs) rich in globular clusters (GCs) in Coma, an increasing n
Externí odkaz:
http://arxiv.org/abs/2409.10205
Autor:
Nepal, Samir, Chiappini, Cristina, Queiroz, Anna B. A., Guiglion, Guillaume, Montalbán, Josefina, Steinmetz, Matthias, Miglio, Andrea, Khalatyan, Arman
Publikováno v:
A&A 688, A167 (2024)
JWST has recently detected numerous disc galaxies at high-redshifts and there have been observations of cold disc galaxies at z > 4 with ALMA. In the Milky Way, recent studies find metal-poor stars in cold disc orbits, suggesting an ancient disc. We
Externí odkaz:
http://arxiv.org/abs/2402.00561
Autor:
Ardern-Arentsen, Anke, Monari, Giacomo, Queiroz, Anna B. A., Starkenburg, Else, Martin, Nicolas F., Chiappini, Cristina, Aguado, David S., Belokurov, Vasily, Carlberg, Ray, Monty, Stephanie, Myeong, GyuChul, Schultheis, Mathias, Sestito, Federico, Venn, Kim A., Vitali, Sara, Yuan, Zhen, Zhang, Hanyuan, Buder, Sven, Lewis, Geraint F., Oliver, William H., Wan, Zhen, Zucker, Daniel B.
The oldest stars in the Milky Way (born in the first few billion years) are expected to have a high density in the inner few kpc, spatially overlapping with the Galactic bulge. We use spectroscopic data from the Pristine Inner Galaxy Survey (PIGS) to
Externí odkaz:
http://arxiv.org/abs/2312.03847
Autor:
Ortigoza-Urdaneta, Mario, Vieira, Katherine, Fernández-Trincado, José G., Queiroz, Anna. B. A., Barbuy, Beatriz, Beers, Timothy C., Chiappini, Cristina, Anders, Friedrich, Minniti, Dante, Tang, Baitian
Publikováno v:
A&A 676, A140 (2023)
Based on high-quality APOGEE DR17 and Gaia DR3 data for 1,742 red giants stars within 5 kpc of the Sun and not rotating with the Galactic disc ($V_\phi <$ 100 km s$^{-1}$), we use the nonlinear technique of unsupervised analysis t-SNE to detect coher
Externí odkaz:
http://arxiv.org/abs/2306.08677
Autor:
Queiroz, Anna B. A., Anders, Friedrich, Chiappini, Cristina, Khalatyan, Arman, Santiago, Basilio X., Nepal, Samir, Steinmetz, Matthias, Gallart, Carme, Valentini, Marica, Ponte, Marina Dal, Barbuy, Beatriz, Pérez-Villegas, Angeles, Masseron, Thomas, Fernández-Trincado, José G., Khoperskov, Sergey, Minchev, Ivan, Fernández-Alvar, Emma, Lane, Richard R., Nitschelm, Christian
Publikováno v:
A&A 673, A155 (2023)
The Gaia mission has provided an invaluable wealth of astrometric data for more than a billion stars in our Galaxy. The synergy between Gaia astrometry, photometry, and spectroscopic surveys give us comprehensive information about the Milky Way. Usin
Externí odkaz:
http://arxiv.org/abs/2303.09926
Autor:
Souza, Stefano O., Ernandes, Heitor, Valentini, Marica, Barbuy, Beatriz, Chiappini, Cristina, Pérez-Villegas, Angeles, Ortolani, Sergio, Friaça, Amâncio C. S., Queiroz, Anna B. A., Bica, Eduardo
Publikováno v:
A&A 671, A45 (2023)
The information on Galactic assembly time is imprinted on the chemodynamics of globular clusters. This makes them important probes that help us to understand the formation and evolution of the Milky Way. Discerning between in-situ and ex-situ origin
Externí odkaz:
http://arxiv.org/abs/2301.05227
Autor:
Limberg, Guilherme, Queiroz, Anna B. A., Perottoni, Hélio D., Rossi, Silvia, Amarante, João A. S., Santucci, Rafael M., Chiappini, Cristina, Pérez-Villegas, Angeles, Lee, Young Sun
In this work, we study the phase-space and chemical properties of Sagittarius (Sgr) stream, the tidal tails produced by the ongoing destruction of Sgr dwarf spheroidal (dSph) galaxy, focusing on its very metal-poor (VMP; $\rm[Fe/H] < -2$) content. We
Externí odkaz:
http://arxiv.org/abs/2212.08249
Autor:
Perottoni, Hélio D., Limberg, Guilherme, Amarante, João A. S., Rossi, Silvia, Queiroz, Anna B. A., Santucci, Rafael M., Perez-Villegas, Angeles, Chiappini, Cristina
In the first billion years after its formation, the Galaxy underwent several mergers with dwarf satellites of various masses. The debris of Gaia-Sausage/Enceladus (GSE), the galaxy responsible for the last significant merger of the Milky Way, dominat
Externí odkaz:
http://arxiv.org/abs/2207.11869
Autor:
Fernández-Trincado, José G., Beers, Timothy C., Queiroz, Anna. B. A., Chiappini, Cristina, Minniti, Dante, Barbuy, Beatriz, Majewski, Steven R., Ortigoza-Urdaneta, Mario, Bidin, Christian Moni, Robin, Annie C., Moreno, Edmundo, Chaves-Velasquez, Leonardo, Villanova, Sandro, Lane, Richard R., Pan, Kaike, Bizyaev, Dmitry
We report the discovery of a new, chemically distinct population of relatively high-metallicity ([Fe/H] $> -0.7$) red giant stars with super-solar [N/Fe] ($\gtrsim +0.75$) identified within the bulge, disk, and halo of the Milky Way. This sample of s
Externí odkaz:
http://arxiv.org/abs/2109.02669
Autor:
Limberg, Guilherme, Santucci, Rafael M., Rossi, Silvia, Queiroz, Anna B. A., Chiappini, Cristina, Souza, Stefano O., Perottoni, Hélio D., Pérez-Villegas, Angeles, Barbosa, Fabrícia O.
We identified 8 additional stars as members of the Helmi stream (HStr) in the combined GALAH+ DR3 and $Gaia$ EDR3 catalog. By consistently reevaluating claimed members from the literature, we consolidate a sample of 22 HStr stars with parameters dete
Externí odkaz:
http://arxiv.org/abs/2105.05958