5 papers
A Quasi-Periodic Oscillation of ~ 30 Minutes in the X-ray Light Curve of the BL Lac S5 0716+714
Alok C. Gupta, Paul J. Wiita, Jeewan C. Pandey +1
We withdraw our claim that a component in an XMM-Newton satellite light curve of the BL Lacertae object S5 0716 + 714 shows quasi-periodic oscillations (QPOs) of 30 minutes.…
Possible Relic Lobes in Giant Radio Sources
S. Godambe, C. Konar, D. J. Saikia +1
We present low-frequency observations with the GMRT of three giant radio sources (J0139+3957, J0200+4049 and J0807+7400) with relaxed diffuse lobes which show no hotspots and no ev…
Quasi Periodic Oscillations due to Axisymmetric and Non-Axisymmetric Shock Oscillations in Black Hole Accretion
Sandip K. Chakrabarti, D. Debnath, P. S. Pal +6
Quasi-Periodic Oscillations (QPOs) are very puzzling since they remain totally unexplained by popular earlier models of accretion disks. The significant rms value in power density…
Behaviour of relativistic black hole accretion sufficiently close to the horizon
Paramita Barai, Ipsita Chakraborty, Tapas K Das +1
This work introduces a novel formalism to investigate the role of the spin of astrophysical black holes in determining the behaviour of matter falling onto such accretors. Equation…
Periodic Oscillations in the Intra-day Optical Light Curves of the Blazar S5 0716+714
Alok C. Gupta, A. K. Srivastava, Paul J. Wiita
We present results of a periodicity search of 20 intra-day variable optical light curves of the blazar S5 0716+714, selected from a database of 102 light curves spanning over three…