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Browsing by Author "Rao, A. R"

Browsing by Author "Rao, A. R"

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  • A double peaked pulse profile observed in GX 1 + 4 
    Paul, B; Agrawal, P. C; Rao, A. R; Manchanda, R. K (Astronomical Society of India, 1996)
    The hard X-ray pulsar GX 1+4 was observed several times in the last few years with a pair of balloon-borne Xenon filled Multi-cell Proportional Counters (XMPC). In a balloon flight made on 22 March 1995, the source was ...
  • Energy dependence of x-ray pulse profile of the crab pulsar 
    Mukerjee, K; Agrawal, P. C; Paul, B; Rao, A. R; Vahia, M. N; Yadav, J. S; Seetha, S; Kasturirangan, K (Astronomical Society of India, 1999)
    We obtained pulse profiles of Crab pulsar in 4 different X-ray energy bands between 2 and 30 keV. We found that all the profiles in these energy ranges show two peaks occurring at the same phase joined by a lower but non ...
  • Hard X-ray spectra of some X-ray binaries from balloon-borne observations 
    Chitnis, V. R; Agrawal, P. C; Manchanda, R. K; Rao, A. R (Astronomical Society of India, 1993)
    We have studied X-ray binaries 4U1907 + 09, GX1 + 4 and Cygnus X-1 in the energy range 20-100 keV, using balloon-borne xenon-filled multilayer proportional counters flown from Hyderabad, India. Results of these observations ...
  • HER X-1 observed in a low state 
    Paul, B; Agrawal, P. C; Rao, A. R; Manchanda, R. K (Astronomical Society of India, 1996)
    The X-ray pulsar Her X-1 was observed on 14th December, 1992 with two balloon borne Xenon filled multicell proportional counters (XMPC) from Hyderabad, India. The source intensity was found to be very low in the 20-100 KeV ...
  • Hint of a galactic origin for a sub-population of extremely short and hard cosmic gamma-ray bursts 
    Shanthi, K; Rao, A. R; Bhat, C. L; Vahia, M. N (Astronomical Society of India, 1999)
    Gamma Ray Bursts (GRBs) belong to an exotic class of astronomical phenomena whose origin and nature continues to puzzle the astrophysical community. These enigmatic events are seen as intense outbursts of high-energy photon ...
  • The Indian multi-wavelength astronomy satellite 
    Rao, A. R (Astronomical Society of India, 1999)
    The Indian X-ray Astronomy Experiment(IXAE) is currently in operation on-board the IRS-P3 satellite launched by the PSLV-D3 rocket in 1996 March 21. Based on IXAE observations, several interesting results have been obtained ...
  • Position sensitive proportional counter 
    Vadawale, S. V; Rao, A. R; Malkar, J. P (Astronomical Society of India, 2000)
    We are developing a Position Sensitive Proportional Counter for X-rays in the energy range from 2 keV to 20 keV. With the sensitive circular area of 30 mm diameter, it can be used as an imaging detector at the focal plane ...
  • Present status of hard X-ray astronomy 
    Rao, A. R (Astronomical Society of India, 1993)
    The recent observational results obtained in the energy range of 15-150 keV from balloon and satellite borne instruments are reviewed. The detection of cyclotron line features in several X-ray binaries, hard X-ray spectra ...
  • Science from "Solar X-ray Spectrometer (SOXS)" - Proposed payload onboard Indian satellite 
    Jain, R; Rao, A. R; Deshpande, M. R; Dwivedi, B. N; Manoharan, P. K; Seetha, S; Vahia, M. N; Vats, H. O; Venkatakrishnan, P (Astronomical Society of India, 2000)
    It is proposed to fly a high spectral and temporal resolution "Solar X-ray Spectrometer (SOXS)" onboard Indian satellite to understand the mechanisms of energy release and particle acceleration in solar flares. The SOXS ...
  • Search for periodicities in distribution of orbits of planets 
    Vahia, M. N; Mahajani, P; Rao, A. R (Astronomical Society of India, 2003)
    We investigate the distribution of extra-solar-system planets in order to search for periodicities in their distribution around their parent star. We use the database of one hundred planets outside the solar system from ...
  • Short-timescale γ -Ray Variability in CTA 102 
    Shukla, A; Mannheim, K; Patel, S. R; Roy, J; Chitnis, V. R; Dorner, D; Rao, A. R; Anupama, G. C; Wendel, C (IOP Publishing, 2018-02)
    The fl at-spectrum radio quasar CTA 102 experienced a prolonged state of enhanced activity across the entire observed electromagnetic spectrum during 2016 – 2017, most pronounced during a major outburst between ...
  • Study of two pulsars with the Indian X-ray Astronomy Experiment 
    Mukerjee, K; Agrawal, P. C; Paul, B; Rao, A. R; Yadav, J. S; Seetha, S; Kasturirangan, K (Astronomical Society of India, 2000)
    The X-ray pulsars Cep X-4 and 4U 1907+09 were observed with the Indian X-ray Astronomy Experiment (IXAE). Observations of Cep-X4 were made during the declining phase of its latest 30 days outburst in 1997, July-August. The ...
  • X-ray bursts from GRS 1915+105 observed with IXAE 
    Yadav, J. S; Agrawal, P. C; Paul, B; Rao, A. R; Vahia, M. N; Seetha, S; Kasturirangan, K (Astronomical Society of India, 1999)
    The light curves of the galactic superluminal X-ray transient source GRS1915+105 observed with the pointed proportional counters (PPC) of Indian X-ray Astronomy Experiment (IXAE)on board IRS-P3 have revealed the presence ...
  • The X-ray observation of newly discovered transient XTE J1748-288 by the Indian X-ray Astronomy Experiment 
    Naik, S; Agrawal, P. C; Paul, B; Rao, A. R; Seetha, S; Kasturirangan, K (Astronomical Society of India, 2000)
    The observations of X-ray transient XTE J1748-288 were made in the energy band 2 - 18 keV with the Indian X-ray astronomy experiment (IXAE) during 1998, June 14-25 with total useful exposure of 27,100 second for 1 sec ...
  • X-Ray variability of active galactic nuclei in the soft and hard X-Ray bands 
    Chitnis, V. R; Pendharkar, J. K; Bose, D; Agrawal, V. K; Rao, A. R; Misra, R (Institute of Physics, 2009-06)
    We investigate the X-ray variability characteristics of hard X-ray-selected active galactic nuclei (AGNs)—based on Swift/Burst Alert Telescope—in the soft X-ray band using the Rossi X-ray Timing Explorer/All-Sky Monitor ...

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