Observation of black holes across their mass scale
Advisor: Jiří Svoboda (AI CAS)
Funding: base scholarship supplemented from a national grant for the first two years. The net income in the first two years will be 20 000 CZK/month. Extension of the supplement beyond the first two years depends on availability of funds.
Contact: jiri.svoboda@asu.cas.cz, http://astro.cas.cz/

Astrophysical black holes exist with a wide range of masses, from a few to ten billion times the mass of the Sun. There is an observational evidence that stellar-mass black holes in X-Ray Binaries (XRB) and super-massive black holes in Active Galactic Nuclei (AGN) have quite a lot in common. When the matter gets to the close proximity to the black hole event horizon, it is forced to orbit with a large velocity. The matter eventually falls into the black hole or is accelerated and directed away from the black hole in the form of a high-velocity equatorial wind or a relativistic highly collimated outflow, so called jet. The processes that lead to either scenario are not yet fully understood, but are probably strongly influenced by the amount of accreting matter or by the black hole angular momentum. This PhD project aims to perform a global study of accretion states of black holes across their mass scale from the available observations, particularly in the X-ray domain.