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tests:collision:mock_data:challenge_4

Challenge 4: M4

Method comparison: N-body model of M4

The mock data is a snapshots of large N-body simulation of the globular cluster M4 are 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 this paper 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. A distance modulus of 11.35 mag was adopted (i.e. D=1862.1 pc). The cluster properties are:

  1. Mtot = 69144.5 M_sun
  2. L_V = 35547.1 L_V_sun
  3. M/L_V = 1.95 Msun/L_V_sun
  4. <m> = 0.495 Msun
  5. r_h = 3.14 pc
  6. r_eff = 1.43 pc
  7. N neutron stars = 130
  8. N black holes = 2
  9. Mass in remnants = 27176.4 Msun

We do the comparison in 3 steps:

  1. Step 1: Surface brightness profile + RVs
  2. Step 2: Surface brightness profile + RVs + PMs ('HST')
  3. Step 3: Surface brightness profile + RVs + PMs ('HST' + 'Gaia')

(+ local mass function for methods allowing it).

DOWNLOAD NEW M4 MOCK DATA (updated 21/03/2017): All the mock data you will need (and more!) are available and bundled here. You can find a summary of the list of files in 'ReadMe_M4_mocks'.

Included are the surface brightness profile, line-of-sight dispersion profile and discrete velocities for RGB stars, HST-like PM dispersion profiles and discrete velocities, Gaia-like (end-of-mission) PM dispersion profiles and discrete velocities (for M4, bulge and halo-like backgrounds), number density profile for bright stars, and local mass function. Mass profiles and the M/L_V profiles (in projection and 3d) are also available. Predictions from best-fit models should be compared to the 3d M/L_V profile.

tests/collision/mock_data/challenge_4.txt · Last modified: 2018/03/16 21:16 by v.henault-brunet