Zobrazeno 1 - 10
of 2 755
pro vyhledávání: '"Walker, P G"'
Existing approaches to model uncertainty typically either compare models using a quantitative model selection criterion or evaluate posterior model probabilities having set a prior. In this paper, we propose an alternative strategy which views missin
Externí odkaz:
http://arxiv.org/abs/2410.17108
Autor:
Vitral, Eduardo, van der Marel, Roeland P., Sohn, Sangmo Tony, Libralato, Mattia, del Pino, Andrés, Watkins, Laura L., Bellini, Andrea, Walker, Matthew G., Besla, Gurtina, Pawlowski, Marcel S., Mamon, Gary A.
Publikováno v:
The Astrophysical Journal, 970:1 (26pp), 2024 July 20
We analyze four epochs of HST imaging over 18 years for the Draco dwarf spheroidal galaxy. We measure precise proper motions (PMs) for hundreds of stars and combine these with existing line-of-sight (LOS) velocities. This provides the first radially-
Externí odkaz:
http://arxiv.org/abs/2407.07769
Autor:
Cristofari, Paul I., Dupree, Andrea K., Milone, Antonino P., Walker, Matthew G., Mateo, Mario, Dotter, Aaron, Bailey III, John I.
We present an analysis of high-resolution optical spectra recorded for 30 stars of the split extended main-sequence turnoff (eMSTO) of the young ($\sim$ 40 Myr) Small Magellanic Cloud (SMC) globular cluster NGC 330. Spectra were obtained with the M2F
Externí odkaz:
http://arxiv.org/abs/2406.10413
We use analytical and $N$-body methods to study the capture of field stars by gravitating substructures moving across a galactic environment. The majority of stars captured by a substructure move on temporarily-bound orbits that are lost to galactic
Externí odkaz:
http://arxiv.org/abs/2404.19069
We present results from simultaneous modeling of 2D (projected along the line of sight) position, proper motion and line-of-sight velocity for \textit{Gaia}- and APOGEE-observed stars near the centre of the Sagittarius (Sgr) dwarf spheroidal galaxy.
Externí odkaz:
http://arxiv.org/abs/2404.16184
Publikováno v:
Atoms. 2024; 12(3):15
We show that a Bose--Einstein Condensate illuminated by a far off-resonant optical pump field and its retroreflection from a feedback mirror can produce stable, localised structures known as optomechanical droplets. We show that these droplets could
Externí odkaz:
http://arxiv.org/abs/2403.14330
Autor:
Garcia, Jonathan Cabrera, Sakari, Charli M., Roederer, Ian U., Evans, Donavon W., Silva, Pedro, Mateo, Mario, Song, Ying-Yi, Kremin, Anthony, Bailey III, John I., Walker, Matthew G.
M15 is a globular cluster with a known spread in neutron-capture elements. This paper presents abundances of neutron-capture elements for 62 stars in M15. Spectra were obtained with the Michigan/Magellan Fiber System (M2FS) spectrograph, covering a w
Externí odkaz:
http://arxiv.org/abs/2403.00063
Autor:
Cui, Fuheng, Walker, Stephen G.
The family of log-concave density functions contains various kinds of common probability distributions. Due to the shape restriction, it is possible to find the nonparametric estimate of the density, for example, the nonparametric maximum likelihood
Externí odkaz:
http://arxiv.org/abs/2401.14515
Autor:
Walker, Matthew G., Caldwell, Nelson, Mateo, Mario, Olszewski, Edward W., Pace, Andrew B., Bailey III, John I., Koposov, Sergey E., Roederer, Ian U.
Publikováno v:
The Astrophysical Journal Supplement Series, 2023, Volume 268, Issue 1, id.19, 40 pp
We present spectroscopic data for 16369 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 multi-object, fiber-fed echelle spect
Externí odkaz:
http://arxiv.org/abs/2312.12738
Publikováno v:
ApJ 968 89 (2024)
A fundamental prediction of the Lambda Cold Dark Matter (LCDM) cosmology is the centrally divergent cuspy density profile of dark matter haloes. Density cusps render CDM haloes resilient to tides, and protect dwarf galaxies embedded in them from full
Externí odkaz:
http://arxiv.org/abs/2311.14798