Zobrazeno 1 - 10
of 37
pro vyhledávání: '"Myeong, G. C."'
Autor:
Myeong, G. C., Belokurov, Vasily, Aguado, David S., Evans, N. Wyn, Caldwell, Nelson, Bradley, James
We report the results of an unsupervised decomposition of the local stellar halo in the chemo-dynamical space spanned by the abundance measurements from APOGEE DR17 and GALAH DR3. In our Gaussian Mixture Model, only four independent components domina
Externí odkaz:
http://arxiv.org/abs/2206.07744
Autor:
Bonaca, Ana, Naidu, Rohan P., Conroy, Charlie, Caldwell, Nelson, Cargile, Phillip A., Han, Jiwon Jesse, Johnson, Benjamin D., Kruijssen, J. M. Diederik, Myeong, G. C., Speagle, Josh, Ting, Yuan-Sen, Zaritsky, Dennis
The origins of most stellar streams in the Milky Way are unknown. With improved proper motions provided by Gaia EDR3, we show that the orbits of 23 Galactic stellar streams are highly clustered in orbital phase space. Based on their energies and angu
Externí odkaz:
http://arxiv.org/abs/2012.09171
Autor:
Aguado, David S., Belokurov, Vasily, Myeong, G. C., Evans, N. Wyn, Kobayashi, Chiaki, Sbordone, Luca, Chanamé, Julio, Navarrete, Camila, Koposov, Sergey E.
The Gaia Sausage (GS) and the Sequoia represent the major accretion events that formed the stellar halo of the Milky Way. A detailed chemical study of these main building blocks provides a pristine view of the early steps of the Galaxy's assembly. We
Externí odkaz:
http://arxiv.org/abs/2012.01430
Autor:
Aguado, David S., Myeong, G. C., Belokurov, Vasily, Evans, N. W., Koposov, Sergey E., Prieto, Carlos Allende, Lanfranchi, Gustavo A., Matteucci, Francesca, Shetrone, Matthew, Sbordone, Luca, Navarrete, Camila, Hernández, Jonay I. González, Chanamé, Julio, de Arriba, Luis Peralta, Yuan, Zhen
The S2 stream is a kinematically cold stream that is plunging downwards through the Galactic disc. It may be part of a hotter and more diffuse structure called the Helmi stream. We present a multi-instrument chemical analysis of the stars in the meta
Externí odkaz:
http://arxiv.org/abs/2007.11003
Autor:
Yuan, Zhen, Myeong, G. C., Beers, Timothy C., Evans, N. Wyn, Lee, Young Sun, Banerjee, Projjwal, Gudin, Dmitrii, Hattori, Kohei, Li, Haining, Matsuno, Tadafumi, Placco, Vinicius M., Smith, M. C., Whitten, Devin D., Zhao, Gang
We search for dynamical substructures in the LAMOST DR3 very metal-poor (VMP) star catalog. After cross-matching with Gaia DR2, there are 3300 VMP stars with available high-quality astrometric information that have halo-like kinematics. We apply a me
Externí odkaz:
http://arxiv.org/abs/1910.07538
The Gaia Sausage is the major accretion event that built the stellar halo of the Milky Way galaxy. Here, we provide dynamical and chemical evidence for a second substantial accretion episode, distinct from the Gaia Sausage. The Sequoia Event provided
Externí odkaz:
http://arxiv.org/abs/1904.03185
The Gaia Sausage is an elongated structure in velocity space discovered by Belokurov et al. (2018) using the kinematics of metal-rich halo stars. It was created by a massive dwarf galaxy ($\sim 5 \times 10^{10} M_\odot$) on a strongly radial orbit th
Externí odkaz:
http://arxiv.org/abs/1805.00453
We use the SDSS-Gaia catalogue to search for substructure in the stellar halo. The sample comprises 62\,133 halo stars with full phase space coordinates and extends out to heliocentric distances of $\sim 10$ kpc. As actions are conserved under slow c
Externí odkaz:
http://arxiv.org/abs/1804.07050
Publikováno v:
The Astrophysical Journal Letters, 856:L26 (6pp), 2018 April 1
We analyse the structure of the local stellar halo of the Milky Way using $\sim$ 60000 stars with full phase space coordinates extracted from the SDSS--{\it Gaia} catalogue. We display stars in action space as a function of metallicity in a realistic
Externí odkaz:
http://arxiv.org/abs/1802.03351
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 475, Issue 2, 1 April 2018, Pages 1537-1548
We use the SDSS-Gaia Catalogue to identify six new pieces of halo substructure. SDSS-Gaia is an astrometric catalogue that exploits SDSS data release 9 to provide first epoch photometry for objects in the Gaia source catalogue. We use a version of th
Externí odkaz:
http://arxiv.org/abs/1712.04071