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Institut für Astronomie und Astrophysik

Abteilung Astronomie

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Preprint L/03

X-Ray Temporal Properties of XTE J1650-500 during Outburst Decay

E. Kalemci (1), J.A. Tomsick (1), R.E. Rothschild (1), K. Pottschmidt (2,3,4), S. Corbel (5), R. Wijnands (6,7), J.M. Miller (6), P. Kaaret (8)

(1) Center for Astrophysics and Space Sciences, Code 0424, University of California at San Diego, La Jolla, CA 92093-0424
(2) Institut für Astronomie und Astrophysik, Abteilung Astronomie, Sand 1, 72076 Tübingen, Germany
(3) INTEGRAL Science Data Center, Chemin d'Écogia 16, 1290 Versoix, Switzerland
(4) Max Planck Institut für extraterrestische Physik, Postfach 1312, 85741 Garching, Germany
(5) Université Paris VII and Service d'Astrophysique, CEA Saclay, F-91191 Gif Sur Yvette, France
(6) Center for Space Research, 70 Vassar Street, NE-80/6055, Massachusetts Institute of Technology, Cambridge, MA 02139
(7) Chandra Fellow
(8) Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138

The Astrophysical Journal 586, 419-426 (2003)

Abstract. We investigated the temporal behavior of the new black hole transient XTE J1650-500 with the Rossi X-Ray Timing Explorer as the source made a transition to the low/hard state during the decay of the 2001 outburst. We find quasi-periodic oscillations in the 4-9 Hz range, enhanced time lags, and reduced coherence during the state transition. We also observe a shift in the peak frequency of the noise component with energy during the transition. The evolution of the power spectrum, as well as the lag and coherence behavior during the state transition, are similar to the state transitions observed for other black hole sources, especially Cyg X-1. We suggest a possible geometry and evolution of a jet+corona+disk system, based on enhanced lags and peak frequency shift during the transition.
Key words: Black Hole Physics, Stars: Individual: Alphanumeric: XTE J1650-500, X-Rays: Stars

Preprint (567 kb PDF file including figures)

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