Hi!
I have some questions about the particleIDs and may please ask:
The particleIDs of dark matter particles (or stars / wind particles) is "Constant for the duration of the simulation" (from IllustrisTNG - Data Access - Specifications). Does it means that a dark matter particle (or stars / wind particles) with a particleID of 6 (a random number) at any snapshot is the same dark matter particles?
As for black holes, IllustrisTNG - Data Access - Specifications writes "May cease to exist in a future snapshot due to a BH merger". My question is that if a massive and less massive black hole with a particleID of 6 and 7, respectively, what is the particleID of the new black hole?
For gas particles, it is more complex. My question with the text "The unique ID (uint64) of this gas cell. Constant for the duration of the simulation. May cease to exist (as gas) in a future snapshot due to conversion into a star/wind particle, accretion into a BH, or a derefinement event." in IllustrisTNG - Data Access - Specifications is that if a gas cell throughout the simulation remains as a gas cell, will it have the same particleID in the simulation?
Dylan Nelson
6 May
(1) Yes.
(2) Unfortunately, it is randomly selected from the two.
(3) In some sense, yes. However, you cannot use the ID of a gas cell to follow gas mass through time. This is because gas mass is exchanged between neighboring cells. So the "gas cell ID" does not have too much meaning (over long periods of time). This is a case where you would/could use the tracer particles.
Hi!
I have some questions about the particleIDs and may please ask:
(1) Yes.
(2) Unfortunately, it is randomly selected from the two.
(3) In some sense, yes. However, you cannot use the ID of a gas cell to follow gas mass through time. This is because gas mass is exchanged between neighboring cells. So the "gas cell ID" does not have too much meaning (over long periods of time). This is a case where you would/could use the tracer particles.