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Ionized Gas Mass in API Version?

Julian Goddy
  • 15 Jan '22

Hi,

I would like to know whether a baryonic mass defined as "mass_gas" + "mass_stars" using the parameters in the API version (for example in https://www.tng-project.org/api/TNG100-1/snapshots/99/subhalos/461864/) includes ionized gas mass.

Thanks,
Julian

Dylan Nelson
  • 17 Jan '22

Dear Julian,

Yes it does: this would be all in "mass_gas". You could obtain the ionized or neutral hydrogen mass from the gas using the particle data in the snapshot and the NeutralHydrogenAbundance field.

Julian Goddy
  • 18 Jan '22

Hi Dylan,
Are you implying that the ionized gas mass and the neutral hydrogen gas mass are the same?

Thanks,
Julian

Dylan Nelson
  • 18 Jan '22

Rather, that ionized_H_mass + neutral_H_mass = total_H_mass =~ 0.75 * total_gas_mass.

Julian Goddy
  • 18 Jan '22

Hi Dylan,
Thanks for the clarification; that makes sense.

Julian

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