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--- tests:collision:challenge3 [2014/10/31 14:23] – v.henault-brunet
+++ tests:collision:challenge3 [2015/08/31 12:37] (current) – removed v.henault-brunet
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-====== Challenge 3 ======
-===== Simulated observations and biases =====
-Leader: Antonio Sollima\\
-Other active participants: Eduardo Balbinot, Paolo Bianchini, Anna Sippel, Mark Gieles, Vincent Henault-Brunet, Alice Zocchi, Anna Lisa Varri
-Questions to address:
-  - How different are the fits when considering: 1) all stars and 2) only visible stars?
-  - Is it better to consider luminosity weighted profiles, or number density profiles?
-  - How much can we do with 2 velocity components instead of 1 (i.e. with Gaia data)?
-Snapshots from [[:tests:collision:mock_data|Sections C and D of the Mock data page]] can be used for this challenge.
-==== Including GAIA realistic errors ====
-Using PyGaia 0.6 and the NBODY snapshots in [[:tests:collision:mock_data|Sections B]].
-Method:
-  - Assume a position for the cluster in the Galaxy (X,Y,Z taken from Harris catalogue)
-  - Transform phase-space coordinates to observed ones (''pygaia.astrometry.vectorastrometry.phaseSpaceToAstrometry'')
-  - Compute errors using ''parallaxErrorSkyAvg'' and ''parallaxErrorSkyAvg''
-  - Back to phase-space with ´''astrometryToPhaseSpace''
-On the plots bellow the red dots are computed using error free data and the black dots using the GAIA error model. The quantity shown is the on-sky velocity dispersion versus the distance to the cluster centre.
-Cluster @ 3kpc
-{{:tests:3kpc_sky_disp.png?200|}}
-Cluster @ 5kpc
-{{:tests:5kpc_sky_disp.png?200|}}
-Cluster @ 8kpc
-{{:tests:8kpc_sky_disp.png?200|}}
-Cluster @ 10kpc
-{{:tests:10kpc_sky_disp.png?200|}}
-Other plots:
-CMD in GAIA photometric system for stars in the snapshot (in this example the cluster is at 3kpc)
-{{:tests:cmd.png?200|}}
-Observed three component velocities (black) and real ones (red) as a function of observed GAIA BP magnitude
-{{:tests:vel_mag.png?200|}}