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Trace: • Challenge 2: Multi-mass clusters (no stellar evolution)
tests:collision:mock_data:challenge_2

Challenge 2: Multi-mass clusters (no stellar evolution)

Data: Snapshots of simulations with a mass function.

  1. N <~= $10^5$, initial half-mass radius 2.25 pc, Henon isochrone model
  2. Initial half-mass relaxation time =~ 350 Myr
  3. no primordial binaries
  4. Galaxy = singular isothermal sphere with Vc = 220 kms/s
  5. Orbit: circular orbit at RG = 4 kpc

The $10^5$ stars were evolved with SSE (Hurley et al. 2000) to an age of 12 Gyr assuming a metallicity of [Fe/H] = -2 before the N-body model was run. Then an assumption was made about the retention fraction of neutron stars (NSs) and black holes (BHs). The snapshots contain all the stars within the tidal radius.

The properties of the snapshots are:

Name f_retention NSs f_rentention BHs age N(NS)_remaining N(BH)_remaining
cluster1 1 1 0.25 Gyr 613 171
cluster1 1 1 0.5 Gyr 591 146
cluster1 1 1 0.75 Gyr 559 134
cluster1 1 1 1 Gyr 548 119
cluster7 0.1 0.1 2 Gyr 51 0

Format of the snapshots are:

$KSTAR$ $m$ $X$ $Y$ $Z$ $V_x$ $V_y$ $V_z$
[Msun] [pc] [km/s]
  1. gc1_1gyr.gz :
  2. gc1_2gyr.gz :
  3. gc1_3gyr.gz :
  4. gc1_4gyr.gz :
  5. gc1_5gyr.gz :
  6. gc1_6gyr.gz :
  7. gc1_7gyr.gz :
  8. gc1_8gyr.gz :
  9. gc1_9gyr.gz :
  10. gc1_10gyr.gz :
  11. gc1_11gyr.gz :

No retention:

  1. gc2_1gyr.gz :
  2. gc2_2gyr.gz :
  3. gc2_3gyr.gz :
  4. gc2_4gyr.gz :
  5. gc2_5gyr.gz :
  6. gc2_6gyr.gz :
  7. gc2_7gyr.gz :
  8. gc2_8gyr.gz :
  9. gc2_9gyr.gz :
  10. gc2_10gyr.gz :
  11. gc2_11gyr.gz :
  12. gc2_12gyr.gz :

The definition of the stellar types (KSTAR) used in the NBODY6 snapshots can be found in the Appendix.

tests/collision/mock_data/challenge_2.txt · Last modified: 2022/10/24 12:28 by 127.0.0.1