Smaller Rmax values in TNG-100-1 Hydro compared to Illustris-1 Hydro
Priyanka Verma
6 Oct
I am currently analyzing TNG-100-1 Hydro and TNG-100-1 Dark simulations, and I have previously performed a similar analysis on Illustris-1 and Illustris-1 Dark. In this analysis, I aim to model the potentials of Milky Way-sized subhalos using their properties, such as Vmax and Rmax, which I obtained from their respective catalogs. My question is about the large difference between the Rmax values of Illustris subhalos and TNG subhalos. For example, if I have a subhalo in Illustris Hydro with a total physical mass of around 1e12 Msun, then I obtain the Rmax value for that subhalo to be approximately 20 kpc or a value close to that number. But if I have a similar mass subhalo in TNG Hydro, I get the Rmax to be extremely small, around 2-3 kpc. The Vmax values match in Illustris and TNG, but the Rmax differs. Could you explain why this is happening, or if I am doing something wrong?
Thanks
Dylan Nelson
7 Oct
Have you made a plot of Rmax vs halo mass, comparing the two simulations? What is the mean difference (at the mass range you are interested in)?
The definitions and measurements are identical. So you should be seeing true differences due to the differing physical models between Illustris and TNG.
I am currently analyzing TNG-100-1 Hydro and TNG-100-1 Dark simulations, and I have previously performed a similar analysis on Illustris-1 and Illustris-1 Dark. In this analysis, I aim to model the potentials of Milky Way-sized subhalos using their properties, such as Vmax and Rmax, which I obtained from their respective catalogs. My question is about the large difference between the Rmax values of Illustris subhalos and TNG subhalos. For example, if I have a subhalo in Illustris Hydro with a total physical mass of around 1e12 Msun, then I obtain the Rmax value for that subhalo to be approximately 20 kpc or a value close to that number. But if I have a similar mass subhalo in TNG Hydro, I get the Rmax to be extremely small, around 2-3 kpc. The Vmax values match in Illustris and TNG, but the Rmax differs. Could you explain why this is happening, or if I am doing something wrong?
Thanks
Have you made a plot of Rmax vs halo mass, comparing the two simulations? What is the mean difference (at the mass range you are interested in)?
The definitions and measurements are identical. So you should be seeing true differences due to the differing physical models between Illustris and TNG.