Question

What are the models used to describe the corona of a black hole?

a) Accretion disc model and Quasar model
b) Plasma model and Nebula model
c) Gravitational lensing model and Dark matter model
d) Magnetohydrodynamic model and Two-temperature model

Answer 1

The models used to describe the corona of a black hole include the Accretion disk model, with thin and "fat" variants, and the Quasar model, which explains powerful energy emissions and jet formations around massive black holes.

Step-by-step explanation:

The models used to describe the corona of a black hole are primarily related to the accretion disk since the corona itself is not as clearly defined in astronomical terms. The two main models are:

• The Accretion disk model: This includes both a thin accretion disk and a "fat" disk, which show how material falls into the gravitational influence of a black hole and forms a disk-like structure around it. The "fat" disk model is particularly important for explaining how the outflow of hot material is channeled into narrow, perpendicular jets.
• The quasar model: This model explains active galactic nuclei and quasars as systems powered by matter falling into and heating up in an accretion disk around a massive black hole. It accounts for the high energy emissions and the perpendicular orientation of observed jets.

While other theories like dark matter, gravitational lensing, and magnetohydrodynamics play significant roles in astrophysics, they are not the primary models associated specifically with black hole coronae.