Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Everall, Andrew"'
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
Autor:
Boubert, Douglas, Everall, Andrew
Large catalogues are ubiquitous throughout astronomy, but most scientific analyses are carried out on smaller samples selected from these catalogues by chosen cuts on catalogued quantities. The selection function of that scientific sample - the proba
Externí odkaz:
http://arxiv.org/abs/2111.04126
Autor:
Everall, Andrew, Boubert, Douglas
We risk reaching false scientific conclusions if we test our physical theories against subsets of the Gaia catalogue without correcting for the biased process by which stars make it into our sample. In this paper we produce selection functions for th
Externí odkaz:
http://arxiv.org/abs/2111.04127
Autor:
Rix, Hans-Walter, Hogg, David W., Boubert, Douglas, Brown, Anthony G. A., Casey, Andrew, Drimmel, Ronald, Everall, Andrew, Fouesneau, Morgan, Price-Whelan, Adrian M.
Publikováno v:
ApJ 2021
Statistical studies of astronomical data sets, in particular of cataloged properties for discrete objects, are central to astrophysics. One cannot model those objects' population properties or incidences without a quantitative understanding of the co
Externí odkaz:
http://arxiv.org/abs/2106.07653
Gaia DR2 published positions, parallaxes and proper motions for an unprecedented 1,331,909,727 sources, revolutionising the field of Galactic dynamics. We complement this data with the Astrometry Spread Function (ASF), the expected uncertainty in the
Externí odkaz:
http://arxiv.org/abs/2101.01723
The completeness of the Gaia catalogues heavily depends on the status of that space telescope through time. Stars are only published with each of the astrometric, photometric and spectroscopic data products if they are detected a minimum number of ti
Externí odkaz:
http://arxiv.org/abs/2011.10578
Precision astrometry from the second Gaia data release has allowed astronomers to predict 5,787 microlensing events, with 528 of these having maximums within the extended Gaia mission (J2014.5 - J2026.5). Future analysis of the Gaia time-series astro
Externí odkaz:
http://arxiv.org/abs/2006.13958
Autor:
Boubert, Douglas, Everall, Andrew
The second data release of the Gaia mission contained astrometry and photometry for an incredible 1,692,919,135 sources, but how many sources did Gaia miss and where do they lie on the sky? The answer to this question will be crucial for any astronom
Externí odkaz:
http://arxiv.org/abs/2005.08983
The Gaia space mission is crafting revolutionary astrometric, photometric and spectroscopic catalogues that will allow us to map our Galaxy, but only if we know the completeness of this Gaia-verse of catalogues: what stars does it contain and what st
Externí odkaz:
http://arxiv.org/abs/2004.14433