Open Access
Table 2
Models considered in this work and their main features.
| Model | IMBH formation | Seeding conditions | Formation histories |
|---|---|---|---|
| A | Runaway stellar collisions and/or hierarchical BBH mergers | tcc < 5 Myr, Z < 0.001 | Uniform for z ∈ [2, 8] |
| A′ | Same as Model A | Same as Model A | Normal dist. around z ∼ 3.2, follows galactic SFR |
| B | Repeated stellar collisions and/or hierarchical BBH mergers | ρcl,0 > 105 M⊙ pc−3, Z < 0.001, Pseed = 0.2 | Same as Model A |
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