61 citations · 392 across the 31 of their papers we have counts for
18 papers · 1 filter
Gravitational self-lensing of Fast Radio Bursts in neutron star magnetospheres: I. The model
Simone Dall'Osso, Riccardo La Placa, Luigi Stella +2
Fast Radio Bursts (FRBs) are cosmological sub-second bursts of coherent radio emission, whose source is still unknown. To date, the galactic magnetar SGR 1935+2154 is the only astr…
Exploring higher order images with Fe K_α-lines from relativistic disks: black hole spin determination and bias
M. Falanga, P. Bakala, R. La Placa +3
We study the contributions to the relativistic Fe line profile from higher order images (HOIs) produced by strongly deflected rays from the disk which cross the plunging regi…
Neutron Star Radius-to-mass Ratio from Partial Accretion Disc Occultation as Measured through Fe K Line Profiles
Riccardo La Placa, Luigi Stella, Alessando Papitto +5
We present a new method to measure the radius-to-mass ratio (R/M) of weakly magnetic, disc-accreting neutron stars by exploiting the occultation of parts of the inner disc by the s…
On one-parametric formula relating the frequencies of twin-peak quasi-periodic oscillations
Gabriel Török, Kateřina Goluchová, Eva Šrámková +3
Twin-peak quasi-periodic oscillations (QPOs) are observed in several low-mass X-ray binary systems containing neutron stars (NSs). Timing analysis of X-ray fluxes of more than doze…
Constraining models of twin peak quasi-periodic oscillations with realistic neutron star equations of state
Gabriel Török, Kateřina Goluchová, Martin Urbanec +8
Twin-peak quasi-periodic oscillations (QPOs) are observed in the X-ray power-density spectra of several accreting low-mass neutron star (NS) binaries. In our previous work we have…
Twin peak quasi-periodic oscillations as signature of oscillating cusp torus
Gabriel Török, Kateřina Goluchová, Jiří Horák +4
Serious theoretical effort has been devoted to explain the observed frequencies of twin-peak quasi-periodic oscillations (HF QPOs) observed in low-mass X-ray neutron star binaries.…
Twin peak HF QPOs as a spectral imprint of dual oscillation modes of accretion tori
Pavel Bakala, Kateřina Goluchová, Gabriel Török +4
High frequency (millisecond) quasi-periodic oscillations (HF QPOs) are observed in the X-ray power-density spectra of several microquasars and low mass X-ray binaries. Two distinct…
Black hole spin inferred from 3:2 epicyclic resonance model of high-frequency quasi-periodic oscillations
E. Sramkova, G. Torok, A. Kotrlova +5
Estimations of black hole spin in the three Galactic microquasars GRS 1915+105, GRO J1655-40, and XTE J1550-564 have been carried out based on spectral and timing X-ray measurement…
Simulations of flux variability of oscillating accretion fluid tori around Kerr black holes
Pavel Bakala, Kateřina Goluchová, Eva Šrámková +4
High frequency quasi-periodic oscillations (HF QPOs) are observed in the X-ray power-density spectra (PDS) of several microquasars and low mass X-ray binaries. Many proposed QPO mo…
Mass-angular-momentum relations implied by models of twin peak quasi-periodic oscillations
Gabriel Torok, Pavel Bakala, Eva Sramkova +3
Twin peak quasi-periodic oscillations (QPOs) appear in the X-ray power-density spectra of several accreting low-mass neutron star (NS) binaries. Observations of the peculiar Z-sour…
Distinguishing between spot and torus models of high-frequency quasiperiodic oscillations
V. Karas, P. Bakala, G. Torok +8
In the context of high-frequency quasi-periodic oscillation (HF QPOs) we further explore the appearance of an observable signal generated by hot spots moving along quasi-elliptic t…
Spectral signature of oscillating slender tori surrounding Kerr black holes
F. H. Vincent, G. P. Mazur, O. Straub +4
Context. Some microquasars exhibit millisecond quasi-periodic oscillations (QPO) that are likely related to phenomena occuring in the immediate vicinity of the central black hole.…
Power density spectra of modes of orbital motion in strongly curved spacetime: obtaining the observable signal
P. Bakala, G. Torok, V. Karas +8
High frequency quasi-periodic oscillations (HF QPOs) appear in the X-ray variability of several accreting low-mass binaries. In a series of works it was suggested that these QPOs m…
Towards modeling quasi-periodic oscillations of microquasars with oscillating slender tori
G. P. Mazur, F. H. Vincent, M. Johansson +4
Context. One of the often discussed models for X-ray binaries high-frequency quasi-periodic oscillations is the oscillating torus model that considers oscillation modes of slender…
Non-geodesic orbital and epicyclic frequencies in vicinity of slowly rotating magnetized neutron stars
Pavel Bakala, Martin Urbanec, Eva Sramkova +2
We study non-geodesic corrections to the quasicircular motion of charged test particles in the field of magnetized slowly rotating neutron stars. The gravitational field is approxi…
Restrictions to neutron star properties based on twin-peak quasi-periodic oscillations
Gabriel Torok, Pavel Bakala, Eva Sramkova +3
We consider twin-peak quasi-periodic oscillations observed in the accreting low-mass neutron star binaries and explore restrictions to central compact object properties that are im…
On mass-constraints implied by the relativistic precession model of twin-peak quasi-periodic oscillations in Circinus X-1
Gabriel Torok, Pavel Bakala, Eva Sramkova +2
Boutloukos et al. (2006) discovered twin-peak quasi-periodic oscillations (QPOs) in 11 observations of the peculiar Z-source Circinus X-1. Among several other conjunctions the auth…
Disc-oscillation resonance and neutron star QPOs: 3:2 epicyclic orbital model
Martin Urbanec, Gabriel Torok, Eva Sramkova +3
The high-frequency quasi-periodic oscillations (HF QPOs) that appear in the X-ray fluxes of low-mass X-ray binaries remain an unexplained phenomenon. Among other ideas, it has been…