Publications of Astronomical Society of India: Recent submissions

  • On the nature of the compact condensations at the centre of galaxies 
    Mitra, A (Astronomical Society of India, 2002)
    There are many observational evidences for the existence of massive compact condensations in the range 106 - 1010 M? at the core of various galaxies and in particular in the core of High Energy Gamma Ray emitting galaxies. ...
  • Astronomy with charged particles 
    Le Coultre, P (Astronomical Society of India, 2002)
    The L3+C experiment takes advantage of the high precision muon spectrometer of the L3 detector installed at LEP, CERN, Geneva, to measure precisely cosmic ray muons. Several physics topics in the field of astrophysics and ...
  • Cosmic ray astrophysics in the knee region and implications for gamma ray astronomy 
    Tonwar, S. C (Astronomical Society of India, 2002)
    Following the discovery of ultra high energy cosmic rays with energies of PeV and higher in the 1950's and detailed studies on the energy spectrum in the TeV-PeV-EeV regions in 1960's, there has been enormous interest in ...
  • Wavefront sampling technique : VHE gamma-ray experiments in India 
    Bhat, P. N (Astronomical Society of India, 2002)
    Atmospheric Cverenkov techniques is the only method which has been successfully used to probe the sky in the TeV energy band. However it has certain intrinsic drawbacks arising primarily out of the presence of cosmic rays ...
  • Advective flow paradigm of disks and outflows around black holes 
    Chakrabarti, S. K (Astronomical Society of India, 2002)
    For the past fifty years, accretion process is being studied initially on normal stars and later, on compact object, such as black holes and neutron stars. In this Review, I present the modern development of this subject ...
  • Physics input from multiwavelength observations of AGN 
    Böttcher, M (Astronomical Society of India, 2002)
    The current status of leptonic jet models for blazars is reviewed. Differences between the quasar and BL-Lac subclasses of blazars may be understood in terms of the dominance of difference radiation mechanisms in the ...
  • An introduction to the Indian Astronomical Observatory, Hanle 
    Cowsik, R; Srinivasan, R; Prabhu, T. P (Astronomical Society of India, 2002)
    Situated in the high-altitude cold desert of Changthang Ladakh bordering Himachal Pradesh and Tibet, Indian Astronomical Observatory, Hanle (32o46m46sN, 78o57'51''E; 4500 m above msl), provides excellent opportunities for ...
  • A review of observational results on very high energy gamma-ray emission from pulsars 
    Vishwanath, P. R (Astronomical Society of India, 2002)
    Radio pulsars have played a very important part in the growth of VHE (Very High Energy) gamma-ray astronomy. Apart from their ability to accelerate particles to very high energies, the modest sensitivity of the first ...
  • Pulsar observations above 1 GeV with future ground-based gamma-ray telescopes 
    de Jager, O. C (Astronomical Society of India, 2002)
    This paper explores the potential of present and future ground based gamma-ray telescopes to detect GeV to multi-GeV pulsed emission from EGRET pulsars. Five types of telescopes can in principle detect such emission: The ...
  • Next Generation Software Based Instruments for Pulsar Astronomy 
    Joshi, B. C; Lyne, A. G; Kramer, M (Astronomical Society of India, 2003)
    High time resolution studies of pulsars require specialized instrumentation to counter the degradation in the quality and time resolution of their radio signals due to dispersion in the inter-stellar medium. The availability ...
  • Sub-Millimeterwave Efforts in India 
    Balasubramanyam, R (Astronomical Society of India, 2003)
    The submillimeter waveband (3 to 0.3 mm) is important for photometric and spectroscopic studies of the high redshift Universe and of the deeply embedded star forming regions in our and nearby galaxies. The upcoming Atacama ...
  • Ground Based Microwave Radiometric Technique in Remote Sensing 
    Rangarajan, K. E; Varghese, B. A (Astronomical Society of India, 2003)
    As an important tool of atmospheric remote sensing, microwave radiometers are used for temperature profiling and vapor and liquid column measurements. In addition, ice water path can be retrieved using radiometer observations. ...
  • Did Radio Galaxies Play a Major Role in the Evolution of the Universe? 
    Krishna, G; Wiita, P. J (Astronomical Society of India, 2003)
    During the `quasar era' at z ~ 2 - 3, radio galaxies had a much higher co-moving density; however, such sources are only detectable for small fractions of their active lifetimes, thanks to expansion losses and inverse ...
  • Physics of Supermassive Disks: Formation and Collapse 
    Mangalam, A (Astronomical Society of India, 2003)
    Supermassive disks are thought to be precursors of supermassive black holes that are believed to power quasars and exist at centers of galaxies. Formation scenarios of such disks are reviewed and it is argued that gas ...
  • Evolution of Stars and Metals in Damped Lyman-alpha Galaxies 
    Kulkarni, V. P (Astronomical Society of India, 2003)
    A unique tool to investigate distant young galaxies is to study the absorption lines they produce in the spectra of background quasars. The damped Lymanalpha (DLA) quasar absorption line systems allow us to empirically ...
  • Magnetars- A Review 
    Panchapakesan, N (Astronomical Society of India, 2003)
    Magnetars are neutron stars in which a decaying high magnetic field is the source of energy production. The suggestion that magnetars are the dominant source of energy for soft gamma repeaters and anomalous x-ray pulsars ...
  • The Binary History and the Magnetic Field of Neutron Stars 
    Konar, S (Astronomical Society of India, 2003)
    There has been strong observational evidence suggesting a casual connection between the binary history of neutron stars and the evolution of their magnetic field. In this article we discuss one of 3 the plausible mechanisms ...
  • IR Spectroscopy of Nova-like Sources 
    Banerjee, D. P. K; Ashok, N. M (Astronomical Society of India, 2003)
    Near - IR spectroscopic and photometric observations of the eruptive variables V838 Mon and V445 Puppis in the J H K bands are reported. These objects erupted in nova-like explosions but evolved into rather unique and ...
  • Open Star Clusters: Star Formation and Structure 
    Pandey, A. K (Astronomical Society of India, 2003)
    Observational evidences indicate that the formation of open star clusters has been efficient throughout the life of our Galaxy. As a consequence, we find open clusters with ages ranging from a few Myr to few Gyr. This makes ...
  • EGRET gamma-ray sources : Observations and physics 
    Mukherjee, R (Astronomical Society of India, 2002)
    High energy astronomy above 30 MeV received a significant impetus from the observations of EGRET (Energetic Gamma-Ray Experiment Telescope) on board the Compton Gamma Ray Observatory (CGRO). Until June 2000, when CGRO was ...

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