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Browsing Publications of Astronomical Society of India by Title

Browsing Publications of Astronomical Society of India by Title

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  • TeV gamma-ray flux estimates from EGRET supernova remnant sources 
    Kaul, R. K (Astronomical Society of India, 2001)
    The EGRET experiment, onboard the Compton Gamma-Ray Observatory (CGRO) satellite, has provided evidence of possible ??100 MeV gamma-ray emission from ~ 22 supernova remnants through positional correlation alone. In view ...
  • Theoretical Cosmology - a Historical Survey 
    Raychaudhuri, A. K (Astronomical Society of Indian, 1987-12)
  • Theory of unstable equilibrium of revolving masses in reference to double stars 
    Ridsdale, A. C (Astronomical Society of India, 1916)
  • Thermal Gravitational Radiation from Stellar objects and its possible detection 
    Sivaram, C (Astronomical Society of India, 1984-12)
  • Thermal-convective instability in a stellar atmosphere 
    Sharma, R. C (Astronomical Society of India, 1990)
    The effect of a variable magnetic field on the thermal-convective instability in a stellar atmosphere in the presence of a stable solute gradient is considered. A dispersion relation is obtained which shows that criteria ...
  • Thermodynamic inflation 
    Sidharth, B. G (Astronomical Society of India, 1997)
    Using the well known fact that at very high temperatures, Bosons, and Fermions both satisfy the same energy, pressure and volume relation, we deduce an inflationary scenario for the early universe.
  • Three Dimensional Structure of Active Regions 
    Choudhary, D. P; Gosain, S (Astronomical Society of India, 2002-09)
    We present the preliminary results of the modeling of the three dimensional structure of the magnetic field above the aclive regions observed with Advanced Stokes polarimeter and Dick Dunn telescope at National ...
  • Threshold energy estimates of TACTIC array elements 
    Sapru, M. L; Satyabhama, N; Koul, M. K; Tickoo, A. K; Bhat, C. L (Astronomical Society of India, 2002)
    Using the CORSIKA-code based simulation studies, we present here results on the gamma-ray and the cosmic-ray proton trigger-thresholds for the Imaging-Element and the 3 Vertex-Elements of the TACTIC atmospheric Cerenkov ...
  • Threshold energy estimates of TACTIC gamma-ray telescope array-Inputs for simulations studies (I) 
    Sathyabama, N; Sapru, M. L; Bhat, C. L; Rannot, R. C; Razdan, A. K; Tickoo, A. K; Koul, M. K; Gandhi, V. N (Astronomical Society of India, 1999)
    Comprehensive simulation studies, using the CORSIKA air-shower code are in progress to predict and optimize the performance of the TACTIC gamma-ray telescope array. Preliminary results are presensted here on the gamma-ray ...
  • Tidal disruption in colliding galaxies 
    Narasimhan, K. S. V. S; Alladin, S. M (Astronomical Society of India, 1982-09)
    Distruptive effects in colliding galaxies due to their mutual tidal interaction are compared under the impulsive approximation. If M1 and M2 are the masses and Rho1 and Rho2 the densities of the two galaxies, M2 suffers ...
  • Tidal effects on a satellite galaxy influenced by a massive perturber 
    Namboodiri, P. M. S; Cowsik, R; Sugimoto, D (Astronomical Society of India, 2000)
    The tidal influence on a satellite galaxy by a massive perturber is studied by numerical simulations. The satellite is modelled as a non-rotating spherical cluster of uniform density. The perturber is a galaxy described ...
  • Tidal interaction between a disc galaxy and a spherical galaxy 
    Zafarullah, S. N; Sastry, K. S (Astronomical Society of Indian, 1987)
    The tidal interaction between a disk and a Plummer model spherical galaxy is studied, extending the impulsive approximation theory to disk galaxies. The fractional change in the internal energy and merger velocities for ...
  • Tidal interactions in spherical galaxies 
    Namboodiri, P. M. S (Astronomical Society of India, 2000)
    Numerical simulations of equal mass galaxies, moving initially on a parabolic orbit, have been performed to see how the total energy of the system changes in close and wide encounters. The results are compared with those ...
  • A Tidal model for the inetracting pair of galaxies VV 117 
    Narasimhan, K. S. V. S; Alladin, S. M (Astronomical Society of India, 1985-12)
    Limber`s (1965) tidal model for the interacting pair of galaxies VV 117 ( = Arp 143 = NGC 2444-45) is improved upon in the light of subsequent H I observations. It is proposed that the spiral Sc component is being disrupted ...
  • Tidally affected galaxies modelled as Maclaurin spheroids 
    Som Sunder, G; Kochhar, R. K; Alladin, S. M (Astronomical Society of Indian, 1989-12)
    Tensor virial equations and impulse approximation are used to study the tidal transfer of energy and angular momentum to a test galaxy, modeled as a Maclaurin spheroid. It is shown that the fractional increase in kinetic ...
  • Tidally compressed molecular gas in ultraluminous and early type galaxies 
    Das, M; Jog, C. J (Astronomical Society of India, 2000)
    The effect of the galactic tidal field is usually considered disruptive in the literature. However, in some cases its effect can become compressive. Using the virial theorem, we have determined the minimum density for a ...
  • TIFR/UPSO 3-metre telescope project 
    Mohan, V (Astronomical Society of India, 1998)
  • Tilt of COBE can constrain aspects of superstring geometry 
    Sivaram, C (Astronomical Society of India, 1997)
    Superstring theories for which experimental evidence is meagre are considered a most promising approach to understand the quantum nature of gravity and its unification with other fundamental interactions. The geometric ...
  • Time delay between H-alpha and soft x-ray emissions during solar flares 
    Verma, V. K; Pande, M. C (Astronomical Society of India, 1985-06)
    A statistical analysis of time delays between H-alpha and soft x-ray (SXR) emissions at onset and peak respectively during solar flares is presented. We find that at the onset of flares SXR emission starts simultaneously ...
  • Time delay in gravitational lens systems and cosmological parameters 
    Narasimha, D (Astronomical Society of India, 2002-09)
    The time delay between the multiple images in gravitational lens systems is affected by large scale mass distribution in the lens, even though it might not have observable effects on the macro images. Inhomogeneity at ...

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