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Browsing Publications of Astronomical Society of India by Subject "Polarization"

Browsing Publications of Astronomical Society of India by Subject "Polarization"

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  • 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 ...
  • Faraday rotation versus stimulated Raman scattering in intense sources 
    Gangadhara, R. T; Krishan, V (Astronomical Society of India, 1993)
    A coherent plasma process such as the stimulated Raman scattering plays significant role in bringing about the changes in polarization characteristics of radiation. It is found that some of the observed polarization ...
  • Magnetic Field Geometry of 3C111 on pc-scales 
    Kharb, P; Gabuzda, D; Shastri, P (Astronomical Society of India, 2003)
    Multi-epoch Very Long Baseline Polarimetric observations of the Broad Line Radio galaxy 3C111 performed at 8 and 43 GHz after a large millimetre outburst, reveal rapidly evolving parsec-scale radioo structure and the ...
  • Non-conservative Rayleigh scattering in a finite atmosphere. I. Polarization of skylight 
    Rangarajan, K. E; Mohan Rao, D; Abhyankar, K. D (Astronomical Society of India, 1994)
  • 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 ...
  • Polarization and electron densities in the solar corona of 1980 February 16 
    Raju, A. K; Abhyankar, K. D (Astronomical Society of Indian, 1986-12)
    Blue and red photographs of the solar corona obtained on February 16, 1980 with the Japal-Rangapur Observatory double polarigraph are analyzed, and calculations for the degree of polarization and the angle of the magnetic ...
  • Polarization in binaries 
    Barman, S. K; Peraiah, A (Astronomical Society of India, 1991)
    Theoretical models are computed for estimating linear polarization from the extended dusty outer layers of the components of a close binary system whose surfaces are distorted by rotation and mutual tidal effects. ...
  • Simulation and experimental studies of polarization properties of atmospheric Cerenkov pulses 
    Bhat, C. L; Rannot, R. C; Mohapatra, D. K; Gandhi, V. N; Tickoo, A. K; Kaul, R; Kaul, S. K; Kaul, S. R; Goyal, H. C; Bhatt, N (Astronomical Society of India, 1999)
    We present here preliminary results obtained form some simulation and experimental investigations on the polarization state of atmospheric Cerenkov events.
  • Study of Radio and Optical Polarization Anisotropies in the Electromagnetic Waves from Extragalactic Sources 
    Sarala, S (Astronomical Society of India, 2003)
    Polarizations of electromagnetic radiation from active galactic nuclei (AGN) show some interesting effects such as the existence of a global anisotropy in the orientations of the radio wave polarizations from distant radio ...
  • Study of variability in BL Lac objects 
    Baliyan, K. S; Ganesh, S; Joshi, U. C; Shah, C. R; Vadher, N. M; Deshpande, M. R (Astronomical Society of India, 2001)
    We have monitored some of the BL Lac objects, such as OJ287, Mrk 421, Mrk 501 etc from Mt Abu Infrared Observatory, using optical photopolarimeter, CCD and NICMOS-3 IR array mounted at the Cassegrain focus of the 1.2 m ...

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