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--- tests:collision:mock_data:challenge_4:m4 [2016/12/16 13:43] – created v.henault-brunet
+++ tests:collision:mock_data:challenge_4:m4 [2016/12/16 13:51] (current) – removed v.henault-brunet
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-===== Challenge 4: Method comparison: N-body model of M4 =====
-The mock data is a snapshots of large $N$-body simulation of the globular cluster M4 are [[http://datashare.is.ed.ac.uk/handle/10283/618?show=full|available here]]. Full lists of data for all particles (mass, position, velocity, stellar type, stellar radius, V magnitude, B-V colour) are given at almost 400 instants in the lifetime of the model. The simulation is described in the [[http://arxiv.org/abs/1409.5597]], which should be cited when making use of this data.
-We selected the snapshot at $t = 12023.9$ Myr and assume that radial/LOS velocities are available for all stars brighter than V=15 (N=1143). A distance modulus of 11.35 mag was adopted (i.e. $D=1862.1$ pc). The cluster properties are:
-  - $M = 69144.5\,M_\odot$
-  - $L_{V} = 35547.1\,L_{V,\odot}$
-  - $M/L_V=1.95$
-  - $r_{\rm h} = 3.14\,{\rm pc}$
-We do the comparison in 3 steps:
-  - Surface brightness profile + RVs
-  - Surface brightness profile + RVs + PMs
-  - Surface brightness profile + RVs + PMs + Gaia
-The data for the 3 fitting steps :
-  - Step 1:
-    - Surface brightness: {{:data:M4_sb.dat.gz}}
-    - Discrete LOS velocities: {{:data:M4_rv.dat.gz}}
-    - LOS velocity dispersion profile: {{:data:M4_rv_disp.dat.gz}}
-  - Step 2:
-    - Discrete proper motions: {{:data:M4_pm_mock.dat.gz}}
-    - Proper motion dispersion profiles: {{:data:M4_pm_disp_mock.dat.gz}}
-For methods that allow it, you can also use constraints from a mock observed mass function at a projected radius of 300 arcseconds from the centre: {{:tests:collision:M4_mass_function.tab.gz}}
-A number density profile for stars brighter than the main-sequence turnoff (V < 17 mag; corresponding to a turnoff mass of 0.82 solar masses) is also available ({{:tests:collision:M4_number_density.dat.gz}}). This can be used as an alternative/complement to the surface brightness profile.
-The mass profile in projection and the $M/L_V$ ratio in projection can be found here:
-  - {{:data:m4_Sigma.dat.gz}}