====== Discs and Extinction Map ======

These mock data are designed to mimic the Milky Way disc - either locally or globally. Key questions include, for the local problem: 

(1) What quality of data are required to determine the local dark matter density? (2) Do multiple populations (e.g. split by abundance/age) help? (3) Is 1D modelling sufficient? 

And for the global problem:

(1) Can global models simultaneously recover the disc phase space distribution function and the gravitational potential? (2) What are the key degeneracies in the problem and how can these be broken? 

If posting new tests, please try to approximately follow the template set out for the "spherical collisionless tests" [[:tests:sphtri|here]]. 

**Key working group coordinator:** Daisuke Kawata 

----

===== Challenges =====

  * [[:tests:discs:GC2014_LocalDMDensity|Local Dark Matter Density]]

  * [[:tests:discs:GC2014_PatternSpeed|Pattern Speed of the Bar and Spiral Arms]]

  * [[:tests:discs:GC2014_SpiralArms|Identifying Stellar Motions associating different Spiral Arm Scenarios]] 

===== Hunt & Kawata challenges for 2015 =====

 Can you recover V_LSR=218.4 km/s and (U,V,W)=(11,12,7) km/s from M0III tracers from:
     - A featureless axisymmetric disc galaxy without extinction or error?
     - The same galaxy with dust extinction added? - Cut at V<20.2714 mag (~G=20 mag)
     - The same galaxy with dust extinction and Gaia like errors added?

^ Model ^ <latex>N</latex> ^ Data file ^ 
| Full data | 5,999,999 | {{:data:1.dat.gz}} | 
| With extinction | 2,372,335 | {{:data:2.dat.gz}} |
| With extinction & error | 2,372,335 | {{:data:3.dat.gz}} |

All in the format: alpha (radians), delta (radians), parallax (arc second), mu-alpha (as/yr), mu-delta (as/yr), radial velocity (km/s), x (kpc), y (kpc), z (kpc), vx (km/s), vy (km/s), vz (km/s), mass (10^12 solar masses), V, V-I.

(x,y,z,vx,vy,vz galactocentric, for checking purposes only!)

The observer is assumed at (-8,0) kpc

===== SNAPDRAGONS tutorial =====

Has moved to: http://astrowiki.ph.surrey.ac.uk/dokuwiki/doku.php?id=snapdragons



===== Gaia errors code September 2015 =====

The code has been updated to compute the astrometric and photometric errors for a fraction of the operation data.

  * https://github.com/mromerog/Gaia-errors

===== The mock data suite =====



=== Local models/mocks ===

  * [[:tests:discs:mockRead1D|Simple 1D data sampled from a distribution function of vertical energy (Read)]]

=== Global models with known background potential ===

  * [[:tests:discs:mockHuntGD|GCD+ N-body disc models (Hunt & Kawata)]]

  * [[:tests:discs:mockMcMillanAGM|Analytic global models with a known distribution function and background potentials (McMillan)]]

  * [[:tests:discs:mockReadfullNBM|Full N-body models (with local cuts) from Justin Read]]

  * [[:tests:discs:mockDOnghia|N-body models from Elena D'Onghia]]

  * [[:tests:discs:mockUB|Barcelona mock data suite]]

  * [[:tests:discs:mockDebattista|Victor Debattista's Model R1]]


==== Archives ====

  * Summary Talk of Disc Working Group at Gaia Challenge 2015 (Barcelona) {{:tests:disc-summary.pdf|Summary 2015}}

  * Summary Talk of Disc Working Group at Gaia Challenge 2014 (Heidelberg) {{:disc-summary14.pdf|Summary 2014}}

  * [[:tests:discs:GC2014_SS1|Short Talks Programme at Splinter Session 1 (27 Oct. 2014)]]

  * [[:tests:discs:GC2013_Discussion|Discussion in Gaia Challenge 2013 (Surrey)]]

  * [[:tests:discs:GC2013_Results|Results from Gaia Challenge 2013 (Surrey)]]