Settings

Initial settings for NewHorizon2

This page describes initial settings set for the NewHorizon2 and what discussions and consensus was made on it.

You can check our namelist file here. The code can be viewed at here.

SMBH physics

Stellar physics

Feedback

• SNII, SNIa, and stellar winds will be included.
• SNII_freq, which defines the number of SN per unit stellar initial mass (from energy point of view) will be set as 0.045/Msol. (According to Chabrier IMF, with setting SN progenitor cut as 8 Msol, this value should be ~0.015). And we define energy generated from SNII as 10^51erg/SN. From several test simulations, we agreed that this value is best for reproducing known empirical relation between stellar-DM mass relation of galaxies.
• SNII will be fixed as single explosion per star particle. Which is actually not the case, the reason for not resolving separate SNII events is to increase the effectiveness of SN feedback.
• Each SNIa will be resolved as single event with energy of 10^51erg.

Chemical evolution

Miscellaneous

Number of snapshots

• ~900 snapshots with 15 Myr interval will be optimal, because we do not particularly bothered by data size for now.
• Unlike NewHorizon, we will try not to generate 'non-scheduled' snapshot dumps that is not in the initially set 15Myr intervals.

Tracer particles

• We will put 1 tracer particles per every 2 initially set. This makes the total number of tracer particles as 1/2 of the fine DM particles.
• We will use Monte-Carlo tracer particle scheme that was recieved from Corentin Cadiou.