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Browsing by Author "Bhat, P. N"

Browsing by Author "Bhat, P. N"

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  • BVRI photometry of the Dipper Asterism region in M 67 
    Anupama, G. C; Kembhavi, A. K; Prabhu, T. P; Singh, K. P; Bhat, P. N (European Southern Observatory, 1995-02)
    We present Cousins BVRI magnitudes for stars in the M 67 `dipper asterism' region, based on observations carried out at the prime focus of the 2.3 m Vainu Bappu Telescope of the Vainu Bappu Observatory, Kavalur. The ...
  • CCD image data acquisition system for optical astronomy 
    Bhat, P. N; Patnaik, K; Kembhavi, A. K; Patnaik, A. R; Prabhu, T. P (CSIR, 1990-11)
  • Distributed data acquisition system for Pachmarhi array of Cverenkov telescopes 
    Upadhya, S. S; Acharya, B. S; Bhat, P. N; Chitnis, V. R; D'Souza, A. I; Francis, P. J; Gothe, K. S; Joshi, S. R; Majumdar, P; Manogaran, M; Nagesh, B. K; Pose, M. S; Purohit, P. N; Rahman, M. A; Rao, K. K; Rao, S. K; Sharma, S. K; Singh, B. B; Stanislaus, A. J; Sudersanan, P. V; Venkatesh Murthy, B. L; Vishwanath, P. R (Astronomical Society of India, 2002)
    Pachmarhi Array of Cverenkov Telescopes consists of 25 Telescopes distributed within an area of 8000m2. The array was designed to detect and process faint Cverenkov light flashes that lasts for a few nanoseconds, produced ...
  • Distribution of ionized gas in X-ray bright early-type galaxies. 
    Singh, K. P; Bhat, P. N; Prabhu, T. P; Kembhavi, A. K (Springer, 1995-10)
    We report imaging observations of Hα+[N II] nebulosities in seven early type galaxies viz., NGC 1399, NGC 1600, NGC 2563, NGC 4203, NGC 4636, NGC 4753 and NGC 5044. These are primarily X-ray bright galaxies which are the ...
  • Dust and ionized gas in NGC 3607 
    Singh, K. P; Prabhu, T. P; Kembhavi, A. K; Bhat, P. N (The American Astronomical Society, 1994-04)
    We report the detection of a broad dust ring in the X-ray-bright elliptical galaxy NGC 3607, the dominant member of a nearby group of galaxies. The inner radius of the ring is approximately 1.3 kpc from the nucleus and has ...
  • A Dust Lane in the Radio Galaxy 3C 270 
    Mahabal, A; Kembhavi, A; Singh, K. P; Bhat, P. N; Prabhu, T. P (American Astronomical Society, 1996-02)
    We present the broad band surface photometry of the radio galaxy 3C 270 (NGC 4261). We find a distinct dust lane in the V - R image of the galaxy and determine its oriantation and size. We use the major axis profile of the ...
  • Estimation of vital shower parameters in wavefront sampling technique 
    Chitnis, V. R; Bhat, P. N (Astronomical Society of India, 2002)
    Wavefront sampling experiments record arrival times of Cverenkov photons with high precision at various locations in Cverenkov pool using a distributed array of telescopes. It was shown earlier that this photon front can ...
  • Fluctuations in Čerenkov photon density in extensive air showers 
    Chitnis, V. R; Bhat, P. N (Astronomical Society of India, 1999)
    In the absence of a standard source of γ-rays or hadrons of known energy one has to study the details of production of Cerenkov light at the observation level only through detailed simulation studies. Recently such studies ...
  • Gamma ray and hadron generated Cverenkov photon spectra at various observation altitudes 
    Rahman, M. A; Bhat, P. N; Acharya, B. S; Chitnis, V. R; Majumdar, P; Vishwanath, P. R (Astronomical Society of India, 2002)
    We have studied the propagation of Cverenkov photons generated by Very High Energy gamma-rays and hadrons in the atmosphere. Photon production height distributions derived from semi-empirical methods agree with those ...
  • Gamma-hadron separation using Cverenkov photon density fluctuations 
    Chitnis, V. R; Bhat, P. N (Astronomical Society of India, 2002)
    In atmospheric Cverenkov technique gamma-rays are detected against abundant background produced by hadronic showers. In order to improve signal to noise ratio of the experiment, it is necessary to reject a significant ...
  • Ground-based Very High Energy Gamma-Ray Astronomy at Pachmarhi 
    Acharya, B. S; Bhat, P. N; D'Souza, A. I; Francis, J; Gothe, K. S; John, A. V; Joshi, S. R; Krishnaswamy, M. R; Mehta, S; Nagesh, B. K; Pereira, M. P; Purohit, P. N; Rao, K. S; Rao, M. V. S; Satyanarayana, G. P; Sudershanan, P. V; Upadhyaya, S. S; Venkateshamurthy, B. L; Vishwanath, P. R (Astronomical Society of India, 1996)
  • High altitude gamma ray observatory at Hanle 
    Sripathi Acharya, B; Cowsik, R; Bhat, P. N; Chitnis, V. R; Vishwanath, P. R; Prabhu, T. P; Srinivasan, R (International Union of Pure and Applied Physics, 2003-07)
    We have carried out Monte Carlo simulations to study the nature of Cherenkov light pool generated by γ -ray and proton primaries for the altitude of Hanle(4515m amsl) in the Himalayas, the site of proposed HAGAR experiment. ...
  • Ionized Gas in Elliptical Galaxies 
    Singh, K. P; Prabhu, T. P; Kembhavi, A. K; Bhat, P. N (Indian Academy of Sciences, 1995-06)
    We report observations of H alpha nebulosities in the X-ray bright elliptical galaxies which are members of nearby groups of galaxies or clusters. Our sample includes NGC 1399, NGC 1600, NGC 2563, NGC 3607, NGC 4203, ...
  • Longitudinal shower development and its signature at observation level 
    Chitnis, V. R; Bhat, P. N (Astronomical Society of India, 2002)
    From a study of Cverenkov photon arrival times at various core distances at the observation level it has already been established that the photon front is well fitted with a spherical surface traveling at the speed of light ...
  • A mini ACT experiment at low and high altitudes 
    Vishwanath, P. R; Acharya, B. S; Bhat, P. N; Chitnis, V. R (Tata Institute of Fundamental Research, 2005)
    A simple experimental apparatus was used to measure rate of cosmic ray events due to Atmospheric Cerenkov Radiation at two mountain altitude sites with the height difference of 3.5 km. The event rates at Hanle (altitude ...
  • Morphological properties of short duration Gamma Ray Bursts 
    Gupta, V; Gupta, P. D; Bhat, P. N (Astronomical Society of India, 2000)
    In this paper, we study a sample of short duration bursts contained in the 3B BATSE catalogue. We fit the time profiles of these GRBs with lognormal functions and study various temporal properties of these objects. In most ...
  • Multicolour broadband study of a lenticular galaxy : NGC 4753 
    Dewangan, G. C; Singh, K. P; Bhat, P. N (Astronomical Society of India, 2000)
    Based on VBT observations, we report multicolour broadband study of a lenticular galaxy, NGC 4753 with prominent dust lanes. The extinction curve derived for NGC 4753 is similar to the Galactic extinction curve. The dust ...
  • Optical counter-parts of Gamma Ray Bursts 
    Bhat, P. N (Astronomical Society of India, 2000)
    Gamma Ray Bursts (GRB'S) being the most energetic astronomical phenomena known to date still pose a formidable challenge to astronomers. The BATSE on board the Compton Observatory (CGRO) launched in 1991, has shown that ...
  • Pachmarhi array of Cerenkov telescopes 
    Bhat, P. N; Acharya, B. S; Chitnis, V. R; D'Souza, A. I; Francis, P. J; Gothe, K. S; John, A. V; Mazumdar, P; Nagesh, B. K; Purohit, P. N; Rahman, M. A; Rao, S. K; Rao, K. K; Sharma, S. K; Stanislaus, A. J; Sudershanan, P. V; Swamy, M. R. K; Upadhyaya, S. S; Murty, B. L. V (Astronomical Society of India, 2000)
    Pachmarhi Array of Cerenkov Telescopes (PACT) consisting of 25 telescopes has been installed at Pachmarhi (longitude : 76d 26' E, latitude : 22d 28' N and altitude : 1075m) recently. The telescopes are deployed in the form ...
  • PACT results on very high energy g-ray emission from CRAB pulsar 
    Sripathi Acharya, B; Vishwanath, P. R; Bhat, P. N; Chitnis, V. R; Majumdar, P; Rahman, M. A; Singh, B. B (International Union of Pure and Applied Physics, 2003-07)
    The data taken on the Crab pulsar by the recently commissioned array of ˇ Cerenkov telescopes at Pachmarhi using the wave front sampling technique have been analyzed. The phasograms show significant excess of events at the ...

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