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SMHASH telecon 03/2015
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Adrian Price-Whelan
March 11, 2015
Science
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SMHASH telecon 03/2015
Adrian Price-Whelan
March 11, 2015
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Transcript
Rewinder adrian price-whelan
Tidal disruption is simple
t = 0 Price-Whelan et al. (2014) Rewinder
Rewinder Price-Whelan et al. (2014) t = -1 evaluate likelihood
Rewinder Price-Whelan et al. (2014) t = -2 evaluate likelihood
Rewinder Price-Whelan et al. (2014) t = -3
⌧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)
−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
8 RR Lyrae stars Gaia velocity errors 2% distance error
Price-Whelan et al. (2014)
Price-Whelan et al. (2014) 8 RR Lyrae stars 2% distance
errors No proper motions
Price-Whelan et al. (2014) Recover unobserved proper motion for stars
Nparams / 6Nstars Good: Bad: - test particle orbits (no
N-body) - arbitrary potentials - observational uncertainties / missing data - less sensitive to observational biases
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.)