Finding specific file for stellar and dark halo analysis.

Matthew Laurence
  • 8 Aug '23

Hey everyone, I am currently doing a research about investigating the relationship between the dark halo and stellar halo for the Milky Way for distance of more than 300kpc from the galactic centre. I was hoping to use TNG100 (I'm not sure the difference between the normal one and the dark) to see whether this simulation would give me some insight about it. However, I was going through the API method to extract data and I slightly unsure on which file and where to find these specific headers. Firstly, I am interested in plotting the stellar mass and halo mass (for cases of more than 300kpc) against the redshift(from z=0 to z=10 or more) as I would like to see if they show the same trend and it would be great also if there is a way to plot the density over the distance( to see what does the simulation tells about the tides cutoff). Lastly, I am interested in the distribution for [Fe/H] < -1 stars at the halo and velocity for satellite galaxies, what kind of file should I extract?

I am slightly familiar with python and I be aiming to use it for the plotting via API method. If you happen to know some relevant paper for this case, do let me know to.

Thank you,

Dylan Nelson
  • 9 Aug '23

I would start with the API Getting Started Guide or the Scripts Getting Started Guide.

Note that "beyond 300 kpc" means beyond the halo, generally speaking. So in order to make this kind of analysis, you will need to consider (i.e. load) all particles in the simulation, and not just particles which belong to a specific halo.

Matthew Laurence
  • 29 Aug '23


I had go through and I still slightly confuse, I tried to find galaxy which is Milky Way like and wanted to plot the number density of stars and DM with respect from galactic centre. I tried to check every subhalo and it has it on Len(DM) and Len(Stars) but how do I plot the dispersion( as in what kind of file I need to focus).


Dylan Nelson
  • 29 Aug '23

Once you have a particular subhalo you are interested in, you should load the Coordinates of all the dark matter particles of that subhalo. Then you can calculate the distance of each from the center of the subhalo. You can then histogram these distances in radial distance bins to compute a radial profile.

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