User Tools

Site Tools


tests:discs:mockhuntgd

GCD+ N-body disc model by Hunt & Kawata

N-body disc models simulated with GCD+ (Kawata & Gibson 2003). These are the target disc models used in Hunt, Kawata & Martel (2013). The fixed Navarro, Frenk & White (1997) dark matter halo profile is applied:

\rho _{dm}=\frac{3H_{0}^{2}}{8\pi G}\frac{\Omega _{0}-\Omega_b}{\Omega_0}\frac{\delta_{c}}{cx(1+cx)^{2}}
where:
 c=r_{200}/r_s ,
 x=r/r_{200},
r_{200}=1.63\times 10^{-2}\left(\frac{M_{200}}{h^{-1}M_{\odot}}\right)^{\frac{1}{3}} h^{-1},
and:
\delta_c = \frac{200}{3} \frac{c^3}{\left[\ln(1+c) - c/(1+c)\right]}.

We assume \Omega_0=0.266=1-\Omega_{\Lambda}, \Omega_{\rm b}=0.044, and H_0=71{\rm kms^{-1}Mpc^{-1}}. A live N-body disc is initially set up and simulated for several Gyr. The data file provides the position, velocity and mass of the disc particles. If you have any question, please email d.kawata (at) ucl (dot) ac (dot) uk.

ASCII data file format:
x,y,z,vx,vy,vz,mp
… format(7(1pE13.5))

x,y,z … position (kpc)
vx,vy,vz … velocity (km/s)
mp … particle mass (Msun)

Model Description M_{200}/M_\odot c N Data file Plot
GD1 Smooth disc 1.75e12 20 99,9982 gcdpdnf1.dat.gz
GD2 Barred disc 2.0e12 9 1,000,000 gcdpdbar1.dat.gz

Error added data

Additionally, we provide the target GD2 in equatorial coordinates, with and without a Gaia-type error, treating the particles as tracers for a single stellar population, in this case M0 Giants.

The errors are computed following Gaia science performance estimates (credit to Mercè Romero Gómez & Francesca Figueras.)

The sun is located at (-8,0,0) kpc in cartesian coordinates. (Note that this does not take into account extinction)

ASCII data file format and units:
output.txt

Model Description M_{200}/M_\odot c N Data file
GD2 M0 tracer Barred disc w & w/o error 2.0e12 9 1,000,000 ubgaiae-out.dat.gz
GD1 Smooth Red Clump w & w/o error 1.75e12 20 999,987 rc-out.dat.gz
GD2 barred Red Clump w & w/o error 2.0e12 9 1,000,000 rc-bar.dat.gz

For the GD1-RC stars for the challenge, the velocity of the sun w.r.t the GC is (0, 228.14, 0) km/s with the sun again at (-8,0,0) kpc.

Publication policy

If using these test data, please cite the Gaia Challenge wiki and Hunt, Kawata & Martel (2013).

GD3

Building on the similar challenge from last years workshop, we provide the data from an N-body galaxy in a known NFW dark matter halo potential, this time with dust extinction and Gaia like errors, for M0III tracers and Red Clump tracers as shown in Hunt & Kawata (2014).

For the GD3 stars for the challenge, the velocity of the sun w.r.t the GC is (0, 228.14, 0) km/s with the sun again at (-8,0,0) kpc. The fixed Navarro, Frenk & White (1997) dark matter halo profile is applied:

\rho _{dm}=\frac{3H_{0}^{2}}{8\pi G}\frac{\Omega _{0}-\Omega_b}{\Omega_0}\frac{\delta_{c}}{cx(1+cx)^{2}}
where:
 c=r_{200}/r_s ,
 x=r/r_{200},
r_{200}=1.63\times 10^{-2}\left(\frac{M_{200}}{h^{-1}M_{\odot}}\right)^{\frac{1}{3}} h^{-1},
and:
\delta_c = \frac{200}{3} \frac{c^3}{\left[\ln(1+c) - c/(1+c)\right]}.

We assume \Omega_0=0.266=1-\Omega_{\Lambda}, \Omega_{\rm b}=0.044, and H_0=71{\rm kms^{-1}Mpc^{-1}}. A live N-body disc is initially set up and simulated for several Gyr. The data file provides the position, velocity and mass of the disc particles. If you have any question, please email d.kawata (at) ucl (dot) ac (dot) uk.

Mock data:

(Note that the mock data was edited on 24/10/14 to provide data with a similar bar angle to the Milky Way)

Model Description M_{200}/M_\odot c N_s Data file
GD3 M0III tracer boxy disc with extinction & error 1.75e12 9 487,417 tracers-m0iii.dat.gz
GD3 M0III tracer boxy disc (No Ex. or error) 1.75e12 9 1,000,000 full.dat.gz

(The pre-edit data is here: m0iii-tracers.dat.gz)

data format:

ASCII data file format and units:
For extinction data: output.txt
For full data: (x,y,z,vx,vy,vz,mass) (kpc, kms^-1, M_solar). The Galactic centre is (0,0), the sun should be at (-8,0) to match extinction added data.

Mock data V<16.5:

(Observed M0III data for V<16.5 mag, cartesian co-ordinates, with and without observational error)

Model Description M_{200}/M_\odot c N_s Data file
GD3 M0III tracer boxy disc V<16.5 no error 1.75e12 9 202,123 vlt16true.dat.gz
GD3 M0III tracer boxy disc V<16.5 with error 1.75e12 9 202,123 vlt16obsv.dat.gz

Format: x,y,z,vx,vy,vz,Vmag (kpc & kms^-1)

Publication policy

If using these test data, please cite the Gaia Challenge wiki and Hunt & Kawata (2014).

tests/discs/mockhuntgd.txt · Last modified: 2014/11/12 10:32 by jash2