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- I. Papadakis2 profiles108 · h 43
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6 papers · 2 filters
Discovery of a Be/X-ray Binary Consistent with the Position of GRO J2058+42
Colleen A. Wilson, Martin C. Weisskopf, Mark H. Finger +4
GRO J2058+42 is a 195 s transient X-ray pulsar discovered in 1995 with BATSE. In 1996, RXTE located GRO J2058+42 to a 90% confidence error circle with a 4' radius. On 20 February 2…
Excitation of low-frequency QPOs in black-hole accretion
Dimitrios Giannios, Henk C. Spruit
We study possible mechanisms of excitation of quasiperiodic oscillations in the accretion flow of black hole accreters in their hard spectral states, in the context of the `truncat…
Multi-band optical micro-variability observations of the BL Lac object S4 0954+658
I. E. Papadakis, V. Samaritakis, P. Boumis +1
We have observed S4 0954+658 in the BVRI bands in 2001, and in the BI bands in 2002. The observations resulted in almost evenly sampled light curves, 3-8 hours long, with an averag…
Spectra and time variability of galactic black-hole X-ray sources in the low/hard state
D. Giannios, N. D. Kylafis, D. Psaltis
we propose a jet model for the low/hard state of black-hole X-ray sources which explains a) the X-ray spectra, b) the timelag spectra, c) the increase in the amplitude (QPO and hig…
Modelling the spectral energy distribution of galaxies. III. Attenuation of stellar light in spiral galaxies
Richard. J. Tuffs, Cristina C. Popescu, Heinrich J. Voelk +2
We present new calculations of the attenuation of stellar light from spiral galaxies using geometries for stars and dust which can reproduce the entire spectral energy distribution…
Spectra of Poynting-flux powered GRB outflows
D. Giannios, H. C. Spruit
We investigate the production of the gamma-ray spectrum of a Poynting-flux dominated GRB ouflow. The very high magnetic field strengths (super-equipartition) in such a flow lead to…