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2017

Using spin to understand the formation of LIGO's black holes

Farr, Ben, Holz, Daniel E., Farr, Will M.

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With the detection of four candidate binary black hole (BBH) mergers by the Advanced LIGO detectors thus far, it is becoming possible to constrain the properties of the BBH merger population in order to better understand the formation of these systems.

Black hole (BH) spin orientations are one of the cleanest discriminators of formation history, with BHs in dynamically formed binaries in dense stellar environments expected to have spins distributed isotropically, in contrast to isolated populations where stellar evolution is expected to induce BH spins preferentially aligned with the orbital angular momentum.
In this work we propose a simple, model-agnostic approach to characterizing the spin properties of LIGO's BBH population.
Using measurements of the effective spin of the binaries, which is LIGO's best constrained spin parameter, we introduce a simple parameter to quantify the fraction of the population that is isotropically distributed, regardless of the spin magnitude distribution of the population.

Using spin to understand the formation of LIGO's black holes · Around

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