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      https://www.ias.ac.in/article/fulltext/joaa/021/01-02/0029-0038

    • Keywords

       

      Accretion, accretion disks; black hole physics; Xrays: stars; stars: individual; XTE J2012+381

    • Abstract

       

      The outburst of X-ray transient source XTE J2012+381 was detected by the RXTE All-Sky Monitor on 1998 May 24th. Following the outburst, X-ray observations of the source were made in the 2–18 keV energy band with the Pointed Proportional Counters of the Indian X-ray Astronomy Experiment (IXAE) on-board the Indian satellite IRS-P3 during 1998 June 2nd–10th. The X-ray flux of the source in the main outburst decreased exponentially during the period of observation. No large amplitude short-term variability in the intensity is detected from the source. The power density spectrum obtained from the timing analysis of the data shows no indication of any quasi-periodic oscillations in 0.002–0.5 Hz band. The hardness ratio i.e. the ratio of counts in 6–18 keV to 2–6 keV band, indicates that the X-ray spectrum is soft with spectral index >2. From the similarities of the X-ray properties with those of other black hole transients, we conclude that the X-ray transient XTE J2012+381 is likely to be a black hole.

    • Author Affiliations

       

      S. Naik1 P. C. Agrawal1 B. Paul1 2 A. R. Rao1 S. Seetha3 K. Kasturirangan3

      1. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai - 400005, India
      2. Institute of Space and Astronautical Science, 3-1-1 Yoshinodai Sagamihara, Kanagawa - 229-8510, Japan
      3. ISRO Satellite Center, Airport Road, Bangalore - 560017, India
    • Dates

       
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