Zobrazeno 1 - 10
of 182
pro vyhledávání: '"Bonaca, Ana"'
Autor:
Nibauer, Jacob, Bonaca, Ana, Spergel, David N., Price-Whelan, Adrian M., Greene, Jenny E., Starkman, Nathaniel, Johnston, Kathryn V.
Stellar streams retain a memory of their gravitational interactions with small-scale perturbations. While perturbative models for streams have been formulated in action-angle coordinates, a direct transformation to these coordinates is only available
Externí odkaz:
http://arxiv.org/abs/2410.21174
The Milky Way Radial Metallicity Gradient as an Equilibrium Phenomenon: Why Old Stars are Metal-Rich
Autor:
Johnson, James W., Weinberg, David H., Blanc, Guillermo A., Bonaca, Ana, Rudie, Gwen C., Yuxi, Lu, Chu, Bronwyn Reichardt, Griffith, Emily J., Sit, Tawny, Johnson, Jennifer A., Dubay, Liam O., Weller, Miqaela K., Boyea, Daniel A., Bird, Jonathan C.
Metallicities of both gas and stars decline toward large radii in spiral galaxies, a trend known as the radial metallicity gradient. We quantify the evolution of the metallicity gradient in the Milky Way as traced by APOGEE red giants with age estima
Externí odkaz:
http://arxiv.org/abs/2410.13256
Autor:
Woody, Turner, Conroy, Charlie, Cargile, Phillip, Bonaca, Ana, Chandra, Vedant, Han, Jiwon Jesse, Johnson, Benjamin D., Naidu, Rohan P., Ting, Yuan-Sen
Our understanding of the assembly timeline of the Milky Way has been transforming along with the dramatic increase in astrometric and spectroscopic data available over the past several years. Many substructures in chemo-dynamical space have been disc
Externí odkaz:
http://arxiv.org/abs/2409.04529
Autor:
Foote, Hayden R., Besla, Gurtina, Garavito-Camargo, Nicolás, Patel, Ekta, Thomas, Guillaume F., Bonaca, Ana, Price-Whelan, Adrian M., Peter, Annika H. G., Zaritsky, Dennis, Conroy, Charlie
Stellar streams in the Milky Way are promising detectors of low-mass dark matter (DM) subhalos predicted by $\Lambda$CDM. Passing subhalos induce perturbations in streams that indicate the presence of the subhalos. Understanding how known DM-dominate
Externí odkaz:
http://arxiv.org/abs/2408.06415
Autor:
Han, Jiwon Jesse, Conroy, Charlie, Zaritsky, Dennis, Bonaca, Ana, Caldwell, Nelson, Chandra, Vedant, Ting, Yuan-Sen
The kinematics of the stellar halo hold important clues to the assembly history and mass distribution of the Galaxy. In this study, we map the kinematics of stars across the Galactic halo with the H3 Survey. We find a complex distribution that breaks
Externí odkaz:
http://arxiv.org/abs/2406.12969
Autor:
Chandra, Vedant, Naidu, Rohan P., Conroy, Charlie, Garavito-Camargo, Nicolas, Laporte, Chervin, Bonaca, Ana, Cargile, Phillip A., Cunningham, Emily, Han, Jiwon Jesse, Johnson, Benjamin D., Rix, Hans-Walter, Ting, Yuan-Sen, Woody, Turner, Zaritsky, Dennis
The infall of the Large Magellanic Cloud (LMC) is predicted to displace the inner Milky Way (MW), imprinting an apparent 'reflex motion' on the observed velocities of distant halo stars. We construct the largest all-sky spectroscopic dataset of lumin
Externí odkaz:
http://arxiv.org/abs/2406.01676
Autor:
Bonaca, Ana, Price-Whelan, Adrian M.
The hierarchical model of galaxy formation predicts that the Milky Way halo is populated by tidal debris of dwarf galaxies and globular clusters. Due to long dynamical times, debris from the lowest mass objects remains coherent as thin and dynamicall
Externí odkaz:
http://arxiv.org/abs/2405.19410
Thin stellar streams originating from globular clusters are among the most sensitive tracers of low-mass dark-matter subhalos. Joint analysis of the entire population of stellar streams will place the most robust constraints on the dark-matter subhal
Externí odkaz:
http://arxiv.org/abs/2405.15851
Stellar streams are sensitive tracers of the gravitational potential, which is typically assumed to be static in the inner Galaxy. However, massive mergers like Gaia-Sausage-Enceladus can impart torques on the stellar disk of the Milky Way that resul
Externí odkaz:
http://arxiv.org/abs/2312.09233
Autor:
Chandra, Vedant, Semenov, Vadim A., Rix, Hans-Walter, Conroy, Charlie, Bonaca, Ana, Naidu, Rohan P., Andrae, Rene, Li, Jiadong, Hernquist, Lars
We illustrate the formation and evolution of the Milky Way over cosmic time, utilizing a sample of 10 million red giant stars with full chemodynamical information, including metallicities and $\alpha$-abundances from low-resolution Gaia XP spectra. T
Externí odkaz:
http://arxiv.org/abs/2310.13050