Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Rewinder
Search
Adrian Price-Whelan
October 30, 2014
Science
0
87
Rewinder
Presented at the Gaia Challenge 2 at the MPIA in Heidelberg.
Adrian Price-Whelan
October 30, 2014
Tweet
Share
More Decks by Adrian Price-Whelan
See All by Adrian Price-Whelan
the Astropy project - Flatware
adrn
1
220
the dynamic Milky Way in the Gaia era
adrn
1
200
The Astropy Project
adrn
1
120
Git and version control
adrn
1
120
Chaos and stellar streams
adrn
1
180
Software testing
adrn
0
200
Local Group Astrostatistics
adrn
1
88
100% Outer Space
adrn
1
160
SMHASH telecon 03/2015
adrn
0
100
Other Decks in Science
See All in Science
機械学習 - DBSCAN
trycycle
PRO
0
860
Machine Learning for Materials (Challenge)
aronwalsh
0
280
安心・効率的な医療現場の実現へ ~オンプレAI & ノーコードワークフローで進める業務改革~
siyoo
0
210
How To Buy, Verified Venmo Accounts in 2025 This year
usaallshop68
2
110
機械学習 - K-means & 階層的クラスタリング
trycycle
PRO
0
820
butterfly_effect/butterfly_effect_in-house
florets1
1
180
データベース05: SQL(2/3) 結合質問
trycycle
PRO
0
700
証明支援系LEANに入門しよう
unaoya
0
1.1k
テンソル分解による糖尿病の組織特異的遺伝子発現の統合解析を用いた関連疾患の予測
tagtag
2
180
CV_5_3dVision
hachama
0
140
Gemini Prompt Engineering: Practical Techniques for Tangible AI Outcomes
mfonobong
2
120
SciPyDataJapan 2025
schwalbe10
0
230
Featured
See All Featured
Automating Front-end Workflow
addyosmani
1370
200k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
45
7.3k
Fantastic passwords and where to find them - at NoRuKo
philnash
51
3.3k
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
mongodb
45
9.6k
Why Our Code Smells
bkeepers
PRO
337
57k
Agile that works and the tools we love
rasmusluckow
329
21k
The Invisible Side of Design
smashingmag
299
50k
Statistics for Hackers
jakevdp
799
220k
Done Done
chrislema
184
16k
Navigating Team Friction
lara
186
15k
Docker and Python
trallard
44
3.4k
How STYLIGHT went responsive
nonsquared
100
5.6k
Transcript
REWINDER Adrian Price-Whelan (Columbia University) Kathryn Johnston, David Hogg, Sarah
Pearson, Andreas Küpper, Allyson Sheffield
Internal dynamics / disruption Underlying potential Streams encode info. about:
How to “fit” stream data? Need a generative model!
GRAVITY Progenitor Lagrange points
Stars Progenitor
Present Past Rewinder
None
Stripped star Progenitor
(Star orbit) - (Progenitor orbit)
x1 = ri · ˆ r prog ( t )
L prog (t), r prog (t), x3 = ri · ˆ L prog ( t ) x2 = ri · ˆ x2
Instantaneous orbital plane
Normalized by tidal radius
None
Incorrect potential
✓ The disruption is simple?
✓ At the (unknown) unbinding time for each star…
“The Pal 5 Challenge” with 4 stars: 3 leading arm
1 trailing arm
None
Previously… Price-Whelan et al. (2014) Nparams / 6Nstars Bug: Computationally
can only use a few stars Feature: We can infer the potential with a few stars!
Price-Whelan et al. (2014)
Now Use importance sampling to marginalize over “true” phase-space positions
of the stars Only params. of marginal likelihood are potential params., progenitor position, nuisance params. Price-Whelan et al. (in prep.)
Price-Whelan et al. (in prep.)
SMHASH Spitzer Merger History And Shape of the Halo RR
Lyrae stars: intrinsic 2% scatter in P-L relation in IR Johnston, Madore, Majewski, Besla, Bono, Clementini, Cioni, Cohen, Freedman, Grillmair, Kallivayalil, Kollmeier, Law, Marengo, Mondon, Nidever, Pietrzynski, Persson, Price-Whelan, Rich, Scowcroft, Seibert, Smith, Sesar, Soszynski, Thompson, Udalski, van der Marel (Madore & Freedman 2012) (+ Spitzer Cycle 9 work)
SMHASH Debris targets: ~30 stars in Orphan stream ~100 stars
in Sagittarius (Sgr) stream 2 Sgr globular clusters 20 Sgr core fields
None