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Preprint 13c/99

RXTE Monitoring of LMC X-3: Recurrent Hard States

J. Wilms (1), M.A. Nowak (2), K. Pottschmidt (1), W.A. Heindl (3), J.B. Dove (4;5), M.C. Begelman (2;6), R. Staubert (1)

(1) Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(2) JILA, University of Colorado, Boulder, CO 80309-440, U.S.A.
(3) CASS, University of California, San Diego, La Jolla, CA 92093, U.S.A.
(4) CASA, University of Colorado, Boulder, CO 80309-389, U.S.A.
(5) Dept. of Physics, Metropolitan State College of Denver, Denver, CO 80217-3362, U.S.A.
(6) APS, University of Colorado, Boulder 80309, U.S.A.

To appear in: Proc. of the 5th Compton Symposium, ed. M. McConnell

Abstract. The black hole candidate LMC X-3 varies by a factor of four on a timescale of either 200 or 100 days (Cowley et al., 1991). We have monitored LMC X-3 with RXTE in three to four week intervals starting in December 1996, obtaining a large observational database that sheds light on the nature of the long term X-ray variability in this source. In this paper we present the results from this monitoring campaign, focusing on evidence of recurring hard states in this canonical soft state black hole candidate.

Key words: -

Paper (66k gzip'ed Postscript including figures)

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