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Browsing Publications of Astronomical Society of India by Subject "X-rays"

Browsing Publications of Astronomical Society of India by Subject "X-rays"

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  • 20-200 keV observations of binary X-ray sources with a balloon-borne payload 
    Manchanda, R. K (Astronomical Society of India, 2000)
    The spectral information in the hard X-ray energy region above 30 keV is available only for a small number of X-ray objects even though hard X-ray flux has been observed from about 80 of the 200,000 X-ray sources cataloged ...
  • ASTROSAT observations: complementary studies from ground 
    Sreekumar, P (Astronomical Society of India, 2005-06)
    Since the advent of the satellite era, X-ray astronomy and UV astronomy have advanced tremendously. The discovery of intense X-ray emission from accreting compact objects has permitted very detailed timing and spectral ...
  • An Expanding Plasma Model for the X-ray/radio knots in KPC-scale Jets of Active Galactic Nuclei 
    Sahayanathan, S; Misra, R; Kembhavi, A. K; Kaul, C. L (Astronomical Society of India, 2003)
    We model the observed X-ray/radio knots in Active Galactic Nuclei (AGN) as isotropically expanding spherical plasma clouds fed continously by non-thermal electrons. The time-dependent electron distribution and the emitted ...
  • Hard X-rays and gamma rays from the Be star LSI +61-303 
    Apparao, K. M. V (Astronomical Society of India, 2000)
    The hard x-ray flux resulting from inverse Compton scattering of photons from the Be star by the high energy electrons responsible for the radio emission, is calculated and compared with observation.
  • Multiwavelength studies of galactic black-hole candidates 
    Yadav, J. S (Astronomical Society of India, 2001)
    One of the Galactic Black-hole Candidates GRS 1915+105 has shown spectacular variability on various time scales in X-ray, Infrared (IR) and Radio wavelengths and has been extensively studied in multiwavelengths during last ...
  • Orbital Evolution of the Binary X-ray Pulsar Her X-1 
    Bhatt, N; Paul, B; Koul, C. L (Astronomical Society of India, 2003)
    We report the discovery of a break in the orbital period evolution of Her X-1, coincident with a recent anomalous low state.
  • PINTofALE : Package for the interactive analysis of line emission 
    Kashyap, V; Drake, J. J (Astronomical Society of India, 2000)
    PINTofALE was developed to analyze spectroscopic data from coronal sources in the 1-1500 Å range. It is based on a modular set of IDL tools that interact with an atomic database and with observational data. The tools allow ...
  • Probes of superclusters at moderate redshifts 
    Narasimha, D; Singh, K. P (Astronomical Society of India, 2000)
    Detection of superclusters at z = 0.2 - 1.0 and determination of their mass provide constraints on the theories of structure formation in the Universe. A combination of the study of hot gas observed in X-rays, and the ...
  • Soft X-ray Imaging Telescope on ASTROSAT 
    Singh, K. P (Astronomical Society of India, 2002-09)
    A Soft X-ray focusing Telescope (SXT) with an X-ray sensitive CCD camera at the focal plane is being developed for the ASTROSAT. Made from conical foil mirrors with a CeD detector in the focal plane SXT will have a ...
  • Understanding the behavior of energy X-rays from the black hole candidate GRS 1915+105 
    Nandi, A; Chakrabarti, S. K (Astronomical Society of India, 2002)
    Black Hole candidate GRS 1915+105 shows a very interesting behaviour at high energy X-rays. For instance, it shows quasi-Periodic Oscillations (QPO) only at high energies. Also the spectral slopes at high energies vary and ...
  • X-ray Spectroscopy of the HMXB Pulsar GX 301-2 with Chandra 
    Mukherjee, U; Paul, B (Astronomical Society of India, 2003)
    We present analysis of X-ray spectra of the accreting pulsar GX 301-2, from two observations with the Chandra X-ray observatory made during different phases of its orbital period. Analysis of the zeroth order ACIS spectra ...

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