1. Home
    2. Journals
    3. Journal of Astrophysics and Astronomy
    4. Volume 42
    5. All articles

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/042/0038

    • Keywords

       

      Black hole physic; binaries: close; X-rays: binaries; X-rays: individual: H 1743-322.

    • Abstract

       

      We present the detection of type C quasi-periodic oscillation (QPO) along with upper harmonic at respective frequencies of $\sim$0.6 Hz and $\sim$1.2 Hz in the single AstroSat observation taken during the 2016 outburst of the low-mass black hole X-ray binary H 1743-322. These frequencies are found to be shifted by $\sim$0.4 Hz for the QPO and $\sim$0.8 Hz for the upper harmonic with respect to that found in the simultaneous XMM-Newton and NuSTAR observation taken five days later than the AstroSat observation, indicating a certain geometrical change in the system. However, the centroid frequency of the QPO and the upper harmonic do not change with energy, indicating the energy-independent nature. The decreasing trend in thefractional rms of the QPO with energy is consistent with the previous results for this source in the low/hard state. The value of the photon index ($\Gamma \sim 1.67$) also indicates that the source was in the low/hard state duringthis particular observation. In addition, similar to the XMM-Newton observations during the same outburst, we find a hard lag of $\sim$21 ms in the frequency range of $\sim$1–5 Hz. The log-linear trend between the averaged time lag and energy indicates the propagation of fluctuations in the mass accretion rate from outer part of the accretion disk to the inner hot regions.

    • Author Affiliations

       

      SWADESH CHAND1 V. K. AGRAWAL2 G. C. DEWANGAN3 PRAKASH TRIPATHI3 PARIJAT THAKUR1

      1. Department of Pure and Applied Physics, Guru Ghasidas Vishwavidyalaya (A Central University), Bilaspur (C.G.) 495 009, India.
      2. Space Astronomy Group, ISITE Campus, ISRO Satellite Centre, Bangalore 560 037, India.
      3. Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007, India.

    • Dates

       
      Published
      10 June 2021
      Manuscript received
      6 November 2020
      Accepted
      18 December 2020
      Final version published online
      10 June 2021

  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.

Contact | Site index