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tests:collision:gc1_archive

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# Archived from GC1 workshop

### Challenge 1: Equal mass clusters in a tidal field

All Stars 1000 stars
Cluster Method
1 Isotropic King (linear dens)
Isotropic King (log dens)
Anisotropic Michie King
2 Isotropic King (linear dens)
Isotropic King (log dens)
Anisotropic Michie King
3 Isotropic King (linear dens)
Isotropic King (log dens)
Anisotropic Michie King
 Cluster Plots 1 Isotropic King vs Anisotropic Michie King 2 Isotropic King vs Anisotropic Michie King 3 Isotropic King vs Anisotropic Michie King

## Challenge 2: Isolated models with stellar evolution

Active participants: Alice Zocchi, Antonio Sollima, Matt Walker, , Laura Watkins, Glenn van de Ven, Pascal Steger?

How important is the effect of mass segregation?

1. How correct is the assumption of energy equipartition (i.e. multi-mass King models)?
2. How different are the fits when considering: 1.) all stars, 2.) only visible stars
3. Is it better to consider luminosity weighted profiles, or number density profiles?
4. How much can we do with 2 velocity components instead of 1 (i.e. with Gaia data)?

### Description of the models:

(Based on simulations ran by Mark Gieles, not published)
Here we consider 2 clusters:

1. IC: Cored gamma/eta model, N = 1e5, Kroupa (2001) mass function between 0.1-100 Msun.
2. No primordial binaries, no central black hole, no tidal.
3. Stellar evolution and mass-loss according to Hurley et al. (2000, 2002)
4. Two values for the metallicity of the stars: [Fe/H] = -2.0 and 0.0 (solar)

Below are 2 snapshots at an age of roughly 12 Gyr. The columns are:

KSTAR
[Msun] [PC] [km s-1] [K] [MAG]

KSTAR is the stellar type and can be between 0 and 22 and the meanings are given below in the Appendix.

Cluster properties:

(3D,M)(2D,L)(2D,M)(2D,N)(Giants)
[] [pc] [pc] [pc] [pc] [km/s][km/s]
1 9.73 3.33 7.27 10.0 2.39 2.52
2 10.9 4.71 8.20 11.3 2.30 2.67

Density distribution for cluster 2:

### (PRELIMINARY) RESULTS:

All Stars ND All Stars Mass All Stars Lum
Cluster Method
1 isotropic King
Multi-mass King
Parametric Jeans
Discrete Jeans
2 Isotropic King
Multi-mass King
Parametric Jeans
Discrete Jeans