https://astrowiki.surrey.ac.uk/ 2026-05-01T23:15:09+00:00 https://astrowiki.surrey.ac.uk/ https://astrowiki.surrey.ac.uk/lib/tpl/dokuwiki/images/favicon.ico text/html 2022-10-24T12:10:47+00:00 Anonymous (anonymous@undisclosed.example.com) https://astrowiki.surrey.ac.uk/doku.php?id=tests:astropars&rev=1666613447&do=diff Stellar parameters The purpose of these exercises is to simulate finding astrophysical parameters from Gaia data, and addressing scientific problems through this. Our main focus is on using the low resolution BP/RP data for this, but we can include the information from astrometry and possibly also high-resolution RVS data. The exact aim depends on which challenges are suggested and which are popular. text/html 2022-10-24T12:10:47+00:00 Anonymous (anonymous@undisclosed.example.com) https://astrowiki.surrey.ac.uk/doku.php?id=tests:collision&rev=1666613447&do=diff Collisional Systems Overview Working group coordinators: Mark Gieles, Vincent Henault-Brunet (m.gieles, v.henault-brunet [at] surrey.ac.uk) Gaia Challenge 4 (Stockholm) Collisional systems discussion and results. You will find here some challenges based on data from collisional N-body models. These mock data are designed to mimic collisional systems like star/globular clusters. text/html 2022-10-24T12:10:47+00:00 Anonymous (anonymous@undisclosed.example.com) https://astrowiki.surrey.ac.uk/doku.php?id=tests:discs&rev=1666613447&do=diff Discs and Extinction Map These mock data are designed to mimic the Milky Way disc - either locally or globally. Key questions include, for the local problem: (1) What quality of data are required to determine the local dark matter density? (2) Do multiple populations (e.g. split by abundance/age) help? (3) Is 1D modelling sufficient? text/html 2022-10-24T12:10:47+00:00 Anonymous (anonymous@undisclosed.example.com) https://astrowiki.surrey.ac.uk/doku.php?id=tests:sphtri&rev=1666613447&do=diff Spherical & Triaxial These mock data are designed to mimic spherical/triaxial collisionless stellar systems (e.g. dwarf galaxies and giant elliptical galaxies). Key questions include: (1) What quality of data are required to determine the mass profile? (2) How can we best break the degeneracy between velocity anisotropy and mass? (3) How badly do we do if we assume spherical symmetry but the galaxy is actually triaxial? text/html 2022-10-24T12:10:47+00:00 Anonymous (anonymous@undisclosed.example.com) https://astrowiki.surrey.ac.uk/doku.php?id=tests:streams&rev=1666613447&do=diff Streams & Halo Stars Content * * * * * * List of of group participants * Description of methods * Summary of results 1. Introduction The mock data in this section are designed to mimic cold/hot streams in the Milky Way halo and the halo star population. Key questions are: