BH Particle Energetics and Comoving Units Clarification
Thomas Pinto Franco
16 Sep
Hello! Just a quick clarification question. For the TNG100-1 Simulation, specifically for the BH particle values BH_CumEgyInjection_QM and BH_CumEgyInjection_RM, if I want to convert a given energy value to ergs at a given high redshift, do I need to account for the comoving unit ckpc by multiplying by the scaling factor at that redshift? Other quantities are listed as "comoving units" in their descriptions, but these specific BH energy values are not.
Initially I assumed I'd have to take that comoving unit into account, however some of the automated google AI responses have been telling me otherwise (without completely clear sources, ugh). I want to make sure as it directly impacts results in my research.
Dylan Nelson
17 Sep
No, you don't. I agree the listed units are a bit confusing.
These fields are UnitMass_in_g * UnitVelocity_in_cm_per_s * UnitVelocity_in_cm_per_s i.e. they are mass*length^2/time in (internal) code units.
Hello! Just a quick clarification question. For the TNG100-1 Simulation, specifically for the BH particle values BH_CumEgyInjection_QM and BH_CumEgyInjection_RM, if I want to convert a given energy value to ergs at a given high redshift, do I need to account for the comoving unit ckpc by multiplying by the scaling factor at that redshift? Other quantities are listed as "comoving units" in their descriptions, but these specific BH energy values are not.
Initially I assumed I'd have to take that comoving unit into account, however some of the automated google AI responses have been telling me otherwise (without completely clear sources, ugh). I want to make sure as it directly impacts results in my research.
No, you don't. I agree the listed units are a bit confusing.
These fields are
UnitMass_in_g * UnitVelocity_in_cm_per_s * UnitVelocity_in_cm_per_si.e. they aremass*length^2/timein (internal) code units.An example conversion is here.
Brilliant, good to know. Thanks!