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This shows you the differences between two versions of the page.

--- tests:collision:gc4 [2016/10/11 07:46] – v.henault-brunet
+++ tests:collision:gc4 [2022/10/24 12:26] (current) – external edit 127.0.0.1
@@ Line 3: / Line 3: @@
 === M4 mass modelling challenge: method comparison ===
-[[:tests:collision:mock_data|M4 mock data can be found at the top of this page]].
+This is a joint project between many participants, centred around mock data from Douglas Heggie’s N-body simulation of M4. The idea is to fit the M4 mock data with various mass modelling techniques and compare the results obtained with these different methods.
+[[:tests:collision:mock_data|M4 mock data can be found here]].
+Some preliminary results from GCIII are shown [[:tests:collision:gc3:method_comp|here]]
+The current plan is to turn this M4 challenge into one ‘Gaia Challenge' paper (coordinated by Vincent), with contributions from the following people/methods (others welcome too):
+  - Jeans modelling (Laura & Antonio - each with their own code)
+  - Multi-mass models with full mass function and SSP model (Vincent)
+  - Three-component multi-mass models (Mark)
+  - Single-mass models (Mark/Alice)
+  - Single-mass models with potential escapers (Ian)
+The plan is to use combined datasets with increasing level of information:
+  - The surface brightness profile and line-of-sight velocity dispersion profile
+  - Then additionally consider HST-like proper-motion dispersion profiles
+  - Finally, fits including all the previous data and including Gaia-like proper motions and distances
+Mock data for steps 1 and 2 are currently available. For step 3, Elena Pancino is working on producing Gaia-like observations of the M4 snapshot (with different simulated backgrounds).
+We want to compare how well the different methods recover or fit the following quantities/observables:
+  - total cluster mass $M$
+  - half-mass radius $r_h$
+  - global mass-to-light ratio $M/L$
+  - $M/L$ profile
+  - general quality of the fit to the velocity dispersion, surface brightness, and anisotropy profile
+  - constraints on the stellar mass function (where applicable)
+  - mass in dark remnants (where applicable)
+You can put your [[:tests:collision:gc4:method_comp|results and any interesting plots/ideas here]].