Gamma-ray astronomy

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Large-scale X-ray jets from Galactic black holes

Nuclear and Particle Physics Proceedings Elsevier 132 (2004) 354-362

Authors:

P Kaaret, S Corbel, JA Tomsick, Y Butt, RP Fender, J Lazendic, JM Miller, JA Orosz, AK Tzioumis, Rudy Wijnands
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Monitoring Cygnus X-1 with RXTE

Nuclear and Particle Physics Proceedings Elsevier 132 (2004) 420-423

Authors:

J Wilms, K Pottschmidt, MA Nowak, T Gleissner, GG Pooley, R Remillard, R Staubert, WA Heindl, P Uttley, RP Fender
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Radio detections of the neutron star X-ray binaries 4U 1820 − 30 and Ser X-1 in soft X-ray states

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 351:1 (2004) 186-192

Authors:

S Migliari, RP Fender, M Rupen, S Wachter, PG Jonker, J Homan, M van der Klis
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GRS 1915+105: The first three months with INTEGRAL

(2004)

Authors:

DC Hannikainen, O Vilhu, J Rodriguez, NJ Westergaard, S Shaw, GG Pooley, T Belloni, AA Zdziarski, RW Hunstead, K Wu, S Brandt, A Castro-Tirado, PA Charles, AJ Dean, Ph Durouchoux, RP Fender, P Hakala, CR Kaiser, AR King, N Lund, IF Mirabel, J Poutanen
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An investigation of the absolute circular polarization in radio pulsars

ArXiv astro-ph/0405145 (2004)

Authors:

Aris Karastergiou, Simon Johnston

Abstract:

In most pulsars, the circularly polarized component, Stokes $V$, is weak in the average pulse profiles. By forming the average profile of $|V|$ from single pulses we can distinguish between pulsars where $V$ is weak in the individual pulses and those where large $V$ of variable handedness is observed from one pulse to the other. We show how $|V|$ profiles depend on the signal-to-noise ratio of $V$ in the single pulses and demonstrate that it is possible to simulate the observed, broad distributions of $V$ by assuming a model where $|V|$ is distributed around a mean value and the handedness of $V$ is permitted to change randomly. The $|V|$ enhanced profiles of 13 pulsars are shown, 5 observed at 1.41 GHz and 8 observed at 4.85 GHz, to complement the set in Karastergiou et al. (2003b). It is argued that the degree of circular polarization in the single pulses is related to the orthogonal polarization mode phenomenon and not to the classification of the pulse components as cone or core.
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