Publications of Astronomical Society of India: Recent submissions

  • Design philosophy of TACTIC -- a high sensitivity VHE gamma-ray telescope 
    Bhat, C. L; Razdan, H; Koul, R; Sapru, M. L; Tickoo, A. K; Rannot, R. C; Kaul, R. K; Kaul, C. L (Astronomical Society of India, 1993)
    TACTIC is a high-sensitivity gound-based very high energy (VHE) telescope designed for undertaking comprehensive temporal and spectral studies of galactic and extragalactic gamma-ray sources. Its main design specifications, ...
  • Site-selection studies at Gurushikar, Mt. Abu for project 'GRACE' 
    Sapru, M. L; Bhat, C. L; Kaul, M. K; Kaul, S. K; Kaul, S. R; Dhar, V. K; Kaul, R. K; Rannot, R. C; Tickoo, A. K (Astronomical Society of India, 1993)
    Holding the promise of yielding up to 1150 hrs of good-quality atmospheric Cerenkov data per calendar year, Gurushikar in Mt. Abu, Rajasthan, offers itself as a good observatory site for our proposed new gamma-ray astrophysics ...
  • Some representative Cerenkov light images recorded by 144-pixel SHALON gamma-ray telescope 
    Nikolsky, S. I; Sinitsyna, V. G; Acobian, A. M; Matizov, B; Vorobiov, S. P; Bhat, C. L; Tickoo, A. K; Rannot, R. C; Sapru, M. L; Razdan, H (Astronomical Society of India, 1993)
    The 144-pixel SHALON imaging telescope was deployed on the nights of 1993 January 20 and 21 to record Cerenkov images of sample cosmic-ray events coming from the direction of zenith. Here, in this preliminary work, we ...
  • Mechanical design and deflection analysis of TACTIC gamma-ray telescope 
    Ramesh Kumar; Suthar, R. L; Murthy, G. S. K; Koul, R; Bhat, C. L; Karkera, B. N (Astronomical Society of India, 1993)
    The high sensitivity gamma-ray telescope TACTIC to be set up at Gurushikar is presently being manufactured at the Central Workshop, Bhabha Atomic Research Centre (BARC). Deflection analysis of the mirror basket assembly, ...
  • Detector instrumentation and drive system for TACTIC gamma-ray telescope 
    Koul, R; Bhat, C. L; Tickoo, A. K; Kaul, I. K; Kaul, S. K; Kaul, S. R; Sapru, M. L; Rannot, R. C (Astronomical Society of India, 1993)
    TACTIC, a high sensitivity gamma-ray telescope is being set up at Gurushikar, Mt. Abu, to undertake comprehensive temporal and spectral studies of cosmic gamma-ray sources in the TeV energy range. The salient features of ...
  • Near infrared high angular resolution observations of stars and circumstellar regions by the technique of lunar occultations 
    Chandrasekhar, T; Ashok, N. M; Sam Ragland (Astronomical Society of India, 1993)
    A program of high angular resolution observations of stars and their circumstellar regions using the technique of lunar occultations has been initiated at the Physical Research Laboratory, Ahmedabad. A liquid nitrogen ...
  • Gamma ray analysis in planetary mapping 
    Yadav, J. S; Arnold, J. R (Astronomical Society of India, 1993)
    n this work, we present ways to improve the analysis procedure for high resolution gamma ray planetary mapping. This study is aimed at providing better analysis procedures for the Gamma Ray Spectrometer (GRS) experiment ...
  • An assessment of far-infrared measurements and their processing 
    Ghosh, S. K; Das, B; Rengarajan, T. N; Verma, R. P (Astronomical Society of India, 1993)
    Three image processing schemes, used for generating far-infrared (FIR) astronomical maps have been compared for their relative merits. Two of these schemes based on the maximum entropy method (MEM) have been developed at ...
  • A two band far-infrared photometer with bolometer arrays 
    Verma, R. P; Rengarajan, T. N; Ghosh, S. K (Astronomical Society of India, 1993)
    A new two band photometer for the Tata Institute of Fundamental Research (TIFR) 1m balloon-borne telescope is described. The detector system consists of two arrays (of six detectors each) of liquid He-3 cooled bolometers. ...
  • A data acquisition system for the TIFR near-infrared camera 
    Ghosh, S. K; Naik, M. B (Astronomical Society of India, 1993)
    A near infrared array camera based on a SBRC 58 x 62 InSb detector (TIRCAM-1) is being developed at Tata Institue of Fundamental Research (TIFR) for astronomical imaging applications. The data acquisition system for this ...
  • Programme for the restoration of the masonry instruments at Delhi Jantar Mantar 
    Babu, G. S. D; Venugopal, V. R (Astronomical Society of India, 1993)
    In 1724 AD, Maharaja Sawai Jai Singh II of Jaipur built a large observatory at Delhi comprising of huge masonry instruments, with which he made careful observations of the celestial objects. He then built four other similar ...
  • Astronomical significance to two Mohenjodaro seals 
    Abhyankar, K. D (Astronomical Society of India, 1993)
    It is shown that the Mohenjodaro Seal No. 420 is a representation of the four constellations corresponding to the four cardinal points of vernal equinox, summer solstice, autumnal equinox and winter solstice at the epoch ...
  • Astronomical observatories for schools, school systems and colleges 
    Ratna, Ved (Astronomical Society of India, 1993)
    n ancient times, India's leadership inatories aimed at schools and school systems in Delhi, Bhopal, Bhubaneshwar, Mysore and Ajmer. In spite of all the seriousness on the part of the then Head of the Department of Science ...
  • IPS survey at 327 MHz for detection of compact radio sources 
    Balasubramanian, V; Janardhan, P; Ananthakrishnan, S; Manoharan, P. K (Astronomical Society of India, 1993)
    In early 1992 a new feed was installed along the focal line of the 530 m long and 30 m wide parabolic cylinder reflector of the Ooty Radio Telescope (ORT). The new feed consisting of 1056 GaAsFET low noise amplifiers, one ...
  • Photometry of X-ray selected quasars from Einstein Medium Sensitivity Survey 
    Singh, K. P; Bhat, P. N; Prabhu, T. P (Astronomical Society of India, 1993)
    We present a few photometric measurements of quasars in the Einstein Medium Sensitivity Survey (EMSS). The measurements are a part of an ongoing program of CCD photometry of quasars in the southern sky and are based on ...
  • Surface photometry of ellipticals: Radio and cluster galaxies 
    Singh, K. P; Bhat, P. N; Prabhu, T. P; Kembhavi, A. K (Astronomical Society of India, 1993)
    Broad-band surface photometry in V, R and I colors is presented for three elliptical galaxies immersed in hot intracluster gas emitting X-rays due to thermal bremsstrahlung. The galaxies are (1) a cD galaxy, and (2) a radio ...
  • Lenses of small angular scales from Jodrell Bank survey 
    Patnaik, A; Narasimha, D (Astronomical Society of India, 1993)
    The Jodrell Bank 5 GHz sky survey provides a complete flux-limited sample of radio sources at latitude greater than 2.5 deg which are brighter than 200 mJy and have a spectrum flatter than 0.5. From the analysis of nearly ...
  • Evidence for nonthermal radiation from the nuclei of Seyfert galaxies 
    Deshpande, M. R; Joshi, U. C (Astronomical Society of India, 1993)
    We report the detection of nonthermal radiation from the nuclei of four Seyfert galaxies through polarization studies. Our investigations on four galaxies (NGC 3081, NGC 4388, NGC 3227 and NGC 2992) show evidence of ...
  • On the nature of radiation from the nucleus of a CD galaxy A0779 
    Deshpande, M. R; Joshi, U. C (Astronomical Society of India, 1993)
    An attempt is made to detect synchrotron radiation from the nucleus of a CD galaxy A-0779 through polarization studies. We have detected a high degree of polarization (up to 9 percent in ultraviolet) with a bimodal ...
  • Starbursts triggered by central overpressure in interacting galaxies 
    Mousumi Das; Jog, C. J (Astronomical Society of India, 1993)
    We present a triggering mechanism for starbursts in the central regions of interacting galaxies. As a disk giant molecular cloud (GMC) falls into the central region of a galaxy following a galaxy encounter, it may be ...

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