Could I assume that every subhalo hosts a single galaxy and, therefore, that I can interpret the 6 entries of the "SubhaloMassType" field as the masses of all types of particles in each single galaxy?
And could I also assume that the first entry of this field is the gas mass and that the other ones follow the GADGET naming convention?
This is broadly right, for instance in almost all the figures of the intro papers, "galaxies" does just mean subhalos.
And the "*Type" fields (with 6 entries) are the same numbering as the snapshots (0=gas, 1=dm, 4=stars+wind, 5=bhs).
Two complications you might want to keep in mind:
There is a fundamental difference between central and satellite subhalos. For many science questions you may just want to consider one of these groups, although you may want to consider all, regardless.
Not every subhalo will host a galaxy (many of the small ones will have zero stellar and/or gas mass, for instance). So you may want to apply some "galaxy criterion" and not just take all subhalos.
Could I assume that every subhalo hosts a single galaxy and, therefore, that I can interpret the 6 entries of the "SubhaloMassType" field as the masses of all types of particles in each single galaxy?
And could I also assume that the first entry of this field is the gas mass and that the other ones follow the GADGET naming convention?
Hi Tommaso,
This is broadly right, for instance in almost all the figures of the intro papers, "galaxies" does just mean subhalos.
And the "*Type" fields (with 6 entries) are the same numbering as the snapshots (0=gas, 1=dm, 4=stars+wind, 5=bhs).
Two complications you might want to keep in mind: