RAGtime 24

Session

X-ray Variability

11 Oct 2022, 16:45

Opava

Conveners

X-ray Variability

• Michal Bursa (ASU)

37. Eccentric accretion flows: a simple model of the stationary structure and oscillations

Jiří Horák (Astronomical Institute ASCR, Prague)

11/10/2022, 16:45

Keynote talk

We present a simple semi-analytic model of geometrically-thin accretion flows with significant eccentricity. The structure of the flow, including three-dimensional density profile and velocity field is described by three azimuthally-dependent quantities giving a thickness of the flow in the radial and vertical direction and radial distribution of the angular momentum. These quantities are a...

31. The mass, spin and rapid X-ray variability of accreting compact objects

Gabriel Török (Silesian University in Opava)

11/10/2022, 17:25

Keynote talk

Following the previous research on epicyclic oscillations of accretion disks around black holes (BHs) and neutron stars (NSs), a new model of high-frequency quasi-periodic oscillations (QPOs) considering radial precession of accretion flow, has been proposed (CT model). Within the model the configuration of accreted fluid is approximated by marginally overflowing accretion tori predicted by...

32. Oscillations and precession of fluid accretion disks around neutron stars

Eva Šrámková

11/10/2022, 18:05

Talk

In addition to the Keplerian frequency of orbital motion, the four characteristic oscillatory frequencies of the accretion flow are often discussed in the context of models of quasi-periodic oscillations (QPOs) observed in the neutron star (NS) low-mass X-ray binaries. These are, namely, the vertical and radial epicyclic frequencies, and the frequencies that correspond to the periastron...