SMHASH telecon 03/2015

Transcript

1. Rewinder adrian price-whelan
2. Tidal disruption is simple
3. t = 0 Price-Whelan et al. (2014) Rewinder
4. Rewinder Price-Whelan et al. (2014) t = -1 evaluate likelihood
5. Rewinder Price-Whelan et al. (2014) t = -2 evaluate likelihood
6. Rewinder Price-Whelan et al. (2014) t = -3
7. ⌧ub K unbinding time leading/trailing tail M mass today any parametrization per star progenitor potential (l, b, d, µl, µb, vr) (l, b, d, µl, µb, vr) marginalize out WE’RE HOSED Rewinder Price-Whelan et al. (2014)
8. −100 −50 0 50 X [kpc] −100 −50 0 X [kpc] x “Data”: Price-Whelan et al. (2014) 8 “RR Lyrae” stars Gaia velocity errors 2% distance errors + Progenitor, same errors
9. 8 RR Lyrae stars Gaia velocity errors 2% distance error Price-Whelan et al. (2014)
10. Price-Whelan et al. (2014) 8 RR Lyrae stars 2% distance errors No proper motions
11. Price-Whelan et al. (2014) Recover unobserved proper motion for stars
12. Nparams / 6Nstars Good: Bad: - test particle orbits (no N-body) - arbitrary potentials - observational uncertainties / missing data - less sensitive to observational biases
13. Next Marginalize true phase-space positions of the stars Marginal likelihood has fixed dimensionality set by potential params., progenitor params Price-Whelan et al. (in prep.)