Papers › The effect of interstellar medium on LVK's black holes
The effect of interstellar medium on LVK's black holes
Sohan Ghodla
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Gravitational radiation alone is not efficient in hardening the orbit of a wide binary black hole (BBH). By employing a toy model for the interstellar medium (ISM) surrounding BBHs, here we discuss the effect of this baryonic medium on BBH dynamics. Depending on the BBH's mass, we show that a binary surrounded by an isotropic cold neutral medium (i.e., an asymptotic temperature T_∞ ≈100 K) with a time-averaged particle density of ⟨n_H ⟩= 𝒪(1) cm⁻³ can play a significant role in hardening the binary orbit over a 𝒪(10⁹) yr time scale. Additionally, this causes the black hole's mass to grow at a rate ∝m². We thus discuss the impact of the ISM on the LIGO-Virgo-KAGRA (LVK) observables and quantify the properties of the ISM under which the latter could act as an additional important pathway for driving a subset of LVK's BBH mergers.
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