Spectral and Temporal Variability in the X-Ray Flux of GS 1124–683, Nova Muscae 1991

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© 1997. The American Astronomical Society. All rights reserved. Printed in U.S.A.
, , Citation Mamoru Takizawa et al 1997 ApJ 489 272 DOI 10.1086/304759

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1 Institute of Space and Astronautical Science, 1-1, Yoshinodai 3-chome, Sagamihara-shi, Kanagawa 229, Japan

2 Present address: NEC Corporation, Shiba 5-7-1, Minato-ku, Tokyo, Japan

3 Present address: NASDA, Hatoyama, Saitama 350-03, Japan

4 Present address: Nikon Corporation, Nishi-ooi 1-6-3, Shinagawa-ku, Tokyo 140, Japan

5 NASA Goddard Space Flight Center, Code 668, Greenbelt, MD 20771

6 Department of Physics, University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113, Japan

7 Department of Physics, Faculty of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560, Japan

8 Present address: Osaka University of Health and Sports Science 1558-1, Noda, Kumatori-cho, Sennan-gun, Osaka 590-04, Japan

9 Present address: Hitachi Corporation, Totsuka 216, Totsuka-ku, Yokohama, Kanagawa 224, Japan

10 Space Radiation Laboratory, Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125

11 Department of Physics, Massachusetts Institute of Technology, MIT 37-637, Cambridge, MA 02139

12 Present address: Max-Planck-Institut für extraterrestrische Physik, Postfach 1603, D-85740 Garching, Germany

Dates

  1. Received 1996 December 2
  2. Accepted 1997 June 9
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0004-637X/489/1/272

Abstract

Correlated variations in timing and spectral properties were observed near the peak of the outburst of Nova Muscae 1991 (GS 1124-683). Two regions with different spectral and timing characteristics can be distinguished in color-color and hardness-intensity diagrams. Two types of quasi-periodic oscillations (QPOs), each associated with regions in these diagrams, have been observed. Rapid flip-flop transitions sometimes occur between the regions. In one region the QPOs' centroid frequency is a strong, increasing function of X-ray intensity. Regions with similar characteristics and similar forms of QPOs were earlier found in GX 339-4 in its very high state. These two regions may turn out to be common and unique to black hole candidates in their very high state, even though they bear some similarities to the spectral branches in neutron star Z sources.

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10.1086/304759