===== Identifying Stellar Motions associating different Spiral Arm Scenarios =====

=== Who ===

R. Grand, S. Roca-Fabrega, L. Jilkova, C. Martinez-Barbosa, H. Abedi, J. Hunt

=== Objectives ===

Identifying Stellar Motions associating different Spiral Arm Scenarios

=== Results ===

Line of sight velocity of an axisymmetric distribution as function of galactic longitude:

{{:tests:discs:vlos_helio_axisym.jpeg?200|}}
{{:tests:discs:vlos_helio_axisym_in.jpeg?200|}}

Residual l.o.s. velocity of an axisymetric distribution as function of galactic longitude:

{{:tests:discs:vlos_res_axisym.jpeg?200|}}

Substracted rotation curve:

{{:tests:discs:rotcurv_axisym.pdf|}}

-What we see is the velocity dispersion (no non-axisymmetric structures present in the model)
-The asymmetry could be a consequence of the asymmetrical drift (it needs to be tested).


=== Data ===

-N-body spiral arms + SPH (Nd=) / corotating (Kawata14)
{{tests:Discs:90deg.dat}}



-N-body spiral arms (Nd=5*10^6) / rigid-body rotation (Manifolds?) (RocaFabrega13)

In each row:

x(Kpc), y(Kpc), z(Kpc), vx(Km/s), vy(Km/s), vz(Km/s)

Positions and velocities are galactocentric. The Sun is placed at (-11.5,0,0)Kpc

data format: (6(f10.3,1x))


https://drive.google.com/file/d/0B8sgZGL4aKpSLWc2SGt1SkhLTk0/view?usp=sharing



-2D Test particle TWA1 spiral arms (i=8º, Nd=5*10^6) / density wave (RocaFabrega14)


In each row:

x(Kpc), y(Kpc), z(Kpc), vx(Km/s), vy(Km/s), vz(Km/s)

Positions and velocities are galactocentric. The Sun is placed at (-8.5,0,0)Kpc

data format: (6(f10.3,1x))

https://drive.google.com/file/d/0B8sgZGL4aKpSdGpfQjM0N3poMWM/view?usp=sharing


-2D Test particle TWA2 spiral arms (i=15º, Nd=5*10^6) / density wave (RocaFabrega14)

In each row:

x(Kpc), y(Kpc), z(Kpc), vx(Km/s), vy(Km/s), vz(Km/s)

Positions and velocities are galactocentric. The Sun is placed at (-8.5,0,0)Kpc

data format: (6(f10.3,1x))


https://drive.google.com/file/d/0B8sgZGL4aKpScGRKRnFSdXpyZDg/view?usp=sharing


-3D Test particle Ferrers bar + response spiral arms (Nd=5*10^6) / rigid-body rotation (Manifolds?) (RomeroGomez14):

In each row:

G ,Grvs ,Xreal (Kpc),Yreal (Kpc),Zreal (Kpc),VXreal (Km/s),VYreal (Km/s),VZreal (Km/s),Xobs (Kpc),Yobs (Kpc),Zobs (Kpc), VXobs (Km/s),VYobs (Km/s),VZobs (Km/s)

Positions and velocities are galactocentric. The Sun is placed at (-8.5,0,0)Kpc

data format: (2(f7.3,1x),3(f7.3,1x),3(f10.2,1x),3(f7.3,1x),3(f10.2,1x))

Real values = without errors -Obs values = with Gaia errors

https://docs.google.com/file/d/0B8sgZGL4aKpSc3dlUnRKdkszaHM/edit?usp=sharing .



-N-body spiral arms (Nd=3*10^6) / Unbarred Great Design spiral (Debatista14)

In each row:  Id(1=disk,2=bulge), x(Kpc), y(Kpc), z(Kpc), vx(Km/s), vy(Km/s), vz(Km/s), Mass (=1)


=== Codes ===

-Cartesian to equatorial + astrometric proper motions (Carmen)

https://github.com/agabrown/PyGaia

-Cartesian to observable (Abedi) 

-L.o.s. tangential and radial velocities (Grand)