Weinberger et al. (2017) states that the gas density ρ used to calculate the BHAR is "the kernel-weighted ambient density around the SMBH."
I am specifically interested in how close the gas cells are to the SMBH for the "kernel-weighted ambient density around the SMBH" mentioned above.
After conducting some research, I came across the following site: https://www.illustris-project.org/w/arepo_docs/modules_black_holes.html
I believe the description of "DesNumNgbBlackHole" corresponds to this.
The site states, "TNG100-1 value: 256, TNG100-2 value: 128, TNG100-3 value: 64,"
and I interpret these numbers as representing the number of gas cells used to calculate the ambient gas density (ρ) around the SMBH.
Is this interpretation correct?
Furthermore, why is there only information about TNG100?
Where can I find similar information for TNG50 and TNG300?
I would greatly appreciate any comments you might have.
Dylan Nelson
29 Jan
Hi Suin,
You can find the values of these parameters for specific runs inside the snapshot files themselves. They are all attributes in the Parameters group, of every snapshot file.
You are right that this parameter is the value. It is implemented in terms of a number of neighbors, instead of e.g. in terms of a radius.
Weinberger et al. (2017) states that the gas density ρ used to calculate the BHAR is "the kernel-weighted ambient density around the SMBH."
I am specifically interested in how close the gas cells are to the SMBH for the "kernel-weighted ambient density around the SMBH" mentioned above.
After conducting some research, I came across the following site:
https://www.illustris-project.org/w/arepo_docs/modules_black_holes.html
I believe the description of "DesNumNgbBlackHole" corresponds to this.
The site states, "TNG100-1 value: 256, TNG100-2 value: 128, TNG100-3 value: 64,"
and I interpret these numbers as representing the number of gas cells used to calculate the ambient gas density (ρ) around the SMBH.
Is this interpretation correct?
Furthermore, why is there only information about TNG100?
Where can I find similar information for TNG50 and TNG300?
I would greatly appreciate any comments you might have.
Hi Suin,
You can find the values of these parameters for specific runs inside the snapshot files themselves. They are all attributes in the
Parametersgroup, of every snapshot file.You are right that this parameter is the value. It is implemented in terms of a number of neighbors, instead of e.g. in terms of a radius.