Zobrazeno 21 - 30
of 381
pro vyhledávání: '"Evans, N. Wyn"'
Autor:
Benisty, David, Vasiliev, Eugene, Evans, N. Wyn, Davis, Anne-Christine, Hartl, Odelia V., Strigari, Louis E.
Publikováno v:
Astrophys.J.Lett. 928 (2022) L5
High accuracy proper motions (PMs) of M31 and other Local Group satellites have now been provided by the {\it Gaia} satellite. We revisit the Timing Argument to compute the total mass $M$ of the Local Group from the orbit of the Milky Way and M31, al
Externí odkaz:
http://arxiv.org/abs/2202.00033
Gravitational acceleration fields can be deduced from the collisionless Boltzmann equation, once the distribution function is known. This can be constructed via the method of normalizing flows from datasets of the positions and velocities of stars. H
Externí odkaz:
http://arxiv.org/abs/2112.07657
We examine the capacity to identify binary systems from astrometric errors and deviations alone. Until the release of the fourth Gaia data release we lack the full astrometric time series that the satellite records, but as we show can still infer the
Externí odkaz:
http://arxiv.org/abs/2111.10380
We use Gaia photometry and astrometry to estimate the vertical spatial structure of the Milky Way at the Solar radius, formally accounting for sample incompleteness (the selection function) and parallax measurement uncertainty. Our results show impre
Externí odkaz:
http://arxiv.org/abs/2111.08043
We introduce a method to infer the vertical distribution of stars in the Milky Way using a Poisson likelihood function, with a view to applying our method to the Gaia catalogue. We show how to account for the sample selection function and for paralla
Externí odkaz:
http://arxiv.org/abs/2111.08042
The VISTA Variables in the Via Lactea (VVV) survey and its extension, have been monitoring about 560 square degrees of sky centred on the Galactic bulge and inner disc for nearly a decade. The photometric catalogue contains of order 10$^9$ sources mo
Externí odkaz:
http://arxiv.org/abs/2106.15617
Autor:
Smith, Leigh C., Koposov, Sergey E., Lucas, Philip W., Sanders, Jason L., Minniti, Dante, Udalski, Andrzej, Evans, N. Wyn, Aguado, David, Ivanov, Valentin D., Saito, Roberto K., Fraga, Luciano, Pietrukowicz, Pawel, Penoyre, Zephyr, González-Fernández, Carlos
We report the serendipitous discovery of a late-type giant star that exhibited a smooth, eclipse-like drop in flux to a depth of 97 per cent. Minimum flux occurred in April 2012 and the total event duration was a few hundred days. Light curves in V,
Externí odkaz:
http://arxiv.org/abs/2106.05300
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
We present a new method of discovering galaxy-scale, strongly-lensed QSO systems from unresolved light curves using the autocorrelation function. The method is tested on five rungs of simulated light curves from the Time Delay Challenge 1 that were d
Externí odkaz:
http://arxiv.org/abs/2011.04667
Autor:
Sanders, Jason L., Evans, N. Wyn
The velocity distributions of stellar tracers in general exhibit weak non-Gaussianity encoding information on the orbital composition of a galaxy and the underlying potential. The standard solution for measuring non-Gaussianity involves constructing
Externí odkaz:
http://arxiv.org/abs/2009.07858