Publications of Astronomical Society of India: Recent submissions

  • GMRT detection of H I absorption in the high-redshift red quasar 3C 190 
    Ishwara-Chandra, C. H; Anantharamaiah, K. R; Dwarakanath, K. S (Astronomical Society of India, 2002-09)
    We report the GMRT detection of H I absorption in the high_ redshlft red quasar 30 190 at a redshift of 1.1946. The most interesting result is that the peak of the H I absorption is blueshifted by I'W 250 kms-1 with respect ...
  • Observations of Associated H I Absorption in Radio Galaxies and Quasars using GMRT 
    Swarup, G; Sarkar, A (Astronomical Society of India, 2002-09)
    We describe observations and preliminary results of absorption by cold hydrogen gas (H I) associated with six radio galaxies and quasars (Table 1) which may provide valuable information about their host galaxies and ...
  • Search for molecules in cool cosmic objects 
    Chandra, S (Astronomical Society of India, 2002-09)
  • Gravitational Wave Astronomy:Probing Physics and Unravelling Astrophysics 
    Iyer, B. R (Astronomical Society of India, 2002-09)
    Kilometer scale Laser Interferometer Gravitational Wave Detectors like LIGO (vntGO) are expected to go online in 2002 (2003). Space interferometers like LISA are scheduled for 2011. In this talk the possible science payoffs ...
  • Gravitational wave astronomy: Recent advances 
    Dhurandhar, S. V (Astronomical Society of India, 2002-09)
    Several groundbased gravitational wave (GW) laser interferometric projects have completed construction and are currently involved in conducting engineering runs. The spacebased NASA-ESA mission, LISA is expected to be ...
  • 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 ...
  • Magnetic helicity in galactic dynamos 
    Subramanian, K (Astronomical Society of India, 2002-09)
    Magnetic fields correlated on kiloparsec scales are seen in spiral galaxies. Their origin ~ould be due to amplification of a small seed field by a turbulent galactic dynamo. We review the current status of the galactic dynamo, ...
  • Atmospheres of components of the close binary stars 
    Srinivasa Rao, M (Astronomical Society of India, 2002-09)
    For theoretical modeling of binary systems, one has to consider realistic models which takes into account the radiative transfer, hydrodynamics, and the effect of irradiation from the secondary component on the atmosphere of ...
  • The electron temperatures of HII regions S 201, S 206 and S 209 : Multi-frequency GMRT observations 
    Omar, A; Chengalur, J. N; Roshi, D. A (Astronomical Society of India, 2002-09)
    Three Galactic HII regions, viz., S 201, S 206, and S 209 have been imaged at three frequencies, viz., 232, 327, and 610 MHz using the GMRT. The resolutions of these images are typically 15" at 232, 10" at 327, and 6" ...
  • Vertical scaleheights of stars and gas in the galaxy 
    Narayan, C. A; Jog, C. J (Astronomical Society of India, 2002-09)
    The vertical scaleheight of atomic hydrogen gas is observed to be nearly constant with radius in the inner Galaxy « 8.5 kpc). This has been a long-standing puzzle (Oort 1962) because the gas scaleheight should ...
  • Tracking pulsar dispersion measures using the GMRT 
    Ahuja, A. L; Gupta, Y; Kembhavi, A. K; Kulkarni, V (Astronomical Society of India, 2002-09)
    We present preliminary results from an ongoing program of accurate pulsar dispersion measure (DM) measurements using the GMRT. From simultaneous dual frequency observations, we are able to determine OMs to accuracies ...
  • Search for pulsed Te V gamma- rays from Crab pulsar with the TACTIC Imaging gamma-ray Telescope 
    Rannot, R. C; Yadav, K. K; Dhar, V. K; Tickoo, A. K; Bhatt, N; Bhattacharyya, S; Chandra, P; Goyal, H. C; Kaul, C. L; Kaul, R. K; Kothari, M; Kotwal, S; Koul, R; Sahayanathan, S; Sapru, M. L; Sharma, M; Venugopal, K; Bhat, C. L (Astronomical Society of India, 2002-09)
    The TACTIC Imaging Element has observed Crab Nebula/pulsar for a total. of about 40 hours during Jan.- Mar. 2001. Preliminary results do not show any evidence of the 33 ms pulsations from the pulsar direction at an energy ...
  • Diamagnetic screening of the magnetic field in accreting neutron stars 
    Konar, S; Choudhuri, A. R (Astronomical Society of India, 2002-09)
    A possible mechanism for screening of the surface magnetic field of an accreting neutron star, by the accreted material, is investigated. In particular, we investigate the nature of the evolution of the internal ...
  • Radio pulsar emission altitudes 
    Kapoor, R. C; Shukre, C. S (Astronomical Society of India, 2002-09)
    By attributing the often seen longitude offsets between the core and conal component centres of pulsar radio pulses to different emission altitudes, we present a new method for investigating these altitudes. OUf method ...
  • Observations of rotational instabilities in Radio Pulsars 
    Joshi, B. C; Lyne, A. G; Jordan, C; Krawczyk, A; Gil, J. A (Astronomical Society of India, 2002-09)
    Two kinds of irregularities are observed in the rotation rates of pulsars - timing noise and glitches. A study of these irregularities is useful as a probe for the internal structure of these stars. We present the ...
  • A high Galactic latitude search for pulsars 
    Joshi, B. C; Burgay, M; Lyne, A. G; Manchester, R. N; Possenti, A; Camilo, F; Amico, N. D; Kramer, M (Astronomical Society of India, 2002-09)
    Millisecond pulsars (MSPs) are an important class of radio pulsars. Their observed spatial distribution is flux limited and is nearly isotropic. Many such pulsars have been observed at high Galactic latitudes. The ...
  • Near-infrared spectroscopy of Nova Sagittarii 2001 (V4643 Sgr) 
    Ashok, N. M; Banerjee, D. P. K; Varricatt, W. P (Astronomical Society of India, 2002-09)
    Near-infrared spectra of the very fast ReiN-type nova, Nova Sagittarii 2001 (V464a Sgr) obtained in the early decline phase and the period 110 to 170 days after the discovery date are presented. The spectrum in the early ...
  • Optical Spectroscopy of the nova-like variable V 445 Puppis 
    Kamath, U. S; Anupama, G. C (Astronomical Society of India, 2002-09)
    V445 Puppis is a peculiar variable which had a nova-like eruption in December 2000. The early spectra did not show any emission lines of hydrogen or helium. Fe II lines were very dominant during this phase. We present optical ...
  • Speckle interferometric observations of close binary stars 
    Saha, S. K; Chinnappan, V; Yeshwanth, L; Anbazhagan, P (Astronomical Society of India, 2002-09)
    Speckle interferometric technique is employed to record a series of hundreds of short-exposure images of several close binary stars with sub-arc second separation through a narrow band filter at the Cassegrain focus of ...
  • Spectral evolution of LMXB GX 349+2 
    Agrawal, V; Sreekumar, P (Astronomical Society of India, 2002-09)
    Z sources are the brightest low-mass X-ray binaries (LMXB) believed to contain magnetized neutron stars. They trace a '2' shaped track in theil X-ray colour-colour diagram. It is thought that the accretion rate increases ...

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