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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Parametric decay instability in 3C 273 
    Gangadhara, R. T; Krishan, V (Cambridge University Press, 1991)
    The parametric decay instability (PDI) causes anomalous absorption of strong electromagnetic (e.m) radiation under specific conditions of energy and momentum conservation. It is shown that in the source 3C 273, the conditions ...
  • Parametric models of the periodogram 
    Mohan, Prashanth; Mangalam, A; Chattopadhyay, S (Indian Academy of Sciences, 2014-04)
    The maximum likelihood estimator is used to determine fit parameters for various parametric models of the Fourier periodogram followed by the selection of the best fit model amongst competing models using the Akaike ...
  • Parametric Study of Molecular Line Polarization in the Solar Atmosphere 
    Rangarajan, K. E; Mohan Rao, D (Indian Academy of Sciences, 2000-12)
  • The parent population of novae in the large magellanic cloud 
    Subramaniam, A; Anupama, G. C (American Institute of Physics, 2002)
    The parent population of novae in the Large Magellanic Cloud (LMC) are identified by a study of the local, projected, stellar populations. The age, density and luminosity function of the stellar population are estimated ...
  • Parity non-conservation in atomic Yb arising from the nuclear anapole moment 
    Singh, A. D; Das, B. P (Institute of Physics, 1999-10)
    The recent experimental observation of the nuclear anapole moment in atomic caesium has confirmed the existence of the nuclear spin-dependent parity non-conserving nucleus-electron interaction. Atomic ytterbium (Yb) is ...
  • Parity nonconservation in ytterbium ion 
    Sahoo, B. K; Das, B. P (American Physical Society, 2011-07)
    We consider parity nonconservation (PNC) in singly ionized ytterbium (Yb+) arising from the neutral current weak interaction. We calculate the PNC electric dipole transition amplitude (E1PNC) and the properties associated ...
  • The parsec-scale central components of FR I radio galaxies 
    Kharb, P; Shastri, P (International Astronomical Union, 2001)
    A majority of a complete sample of 3CR FR I radio galaxies show unresolved optical nuclear sources on the scales of 0.1 arcsec. These Compact Central Cores (CCC) have been interpreted as the optical counterparts of the ...
  • Parsec-scale jet properties of the quasar PG 1302-102 
    Mohan, P; An, T; Frey, S; Mangalam, A; Gabanyi, K. E; Kun, E (Oxford University Press on behalf of the Royal Astronomical Society, 2016-12-01)
    The quasar PG 1302−102 is believed to harbour a supermassive binary black hole (SMBBH) system. Using the available 15 GHz and 2–8 GHz, multi-epoch Very Long Baseline Array data, we constrain the pc-scale jet properties ...
  • Parsec-scale magnetic field structures in HEAO-1 BL Lacs 
    Kharb, P; Gabuzda, D; Shastri, P (Blackwell Publishing, 2008-02)
    We present very long baseline interferometry polarization images of an X-ray-selected sample of BL Lacertae objects belonging to the first HEAO-1 and the ROSAT–Green Bank (RGB) surveys. These are primarily high-energy-peaked ...
  • Parsec-scale radio morphology in Seyfert galaxies 
    Lal, D. V; Shastri, P; Gabuzda, D. C (The Astronomical Society of the Pacific, 2001)
  • Partial redistribution effects on line polarization in the presence of velocity fields 
    Nagendra, K. N (Springer, 1996-03)
    Velocity fields in line formation regions strongly affect the line polarization. The conventionally used observer's frame method of solving the polarized transfer equation becomes expensive and inaccurate for partial ...
  • Partial Redistribution Theory and its Applications in the Interpretation of the Second Solar Spectrum 
    Nagendra, K. N (Astronomical Society of the Pacific, 2014-10)
    In this review we first describe briefly the techniques to formulate partial redistribution (PRD) matrices for polarized line scattering on atoms. These matrices have to be formulated by either semi-classical or quantum ...
  • Particle emission from Sun 
    Vahia, M. N (Indian Institute of Astrophysics, Bangalore, 1988)
    Recent results on various aspects of solar energetic particles are reviewed. A possible grain component of the polar particles is discussed in brief. The plasma component namely the solar wind and the solar energetic ...
  • Particle magnetic moments in Kaluza-Klein strong gravity 
    de Sabbata, V; Sivaram, C (Springer, 1990-10)
    We discuss the Kaluza-Klein theory in the strong-gravity framework: this leads naturally to the values of the elementary-particle magnetic moments showing also that the spin of the particle, through torsion, plays a more ...
  • Particle production during inflation: a Bayesian analysis with CMB data from Planck 2018 
    Naik, Suvedha Suresh; Furuuchi, Kazuyuki; Pravabati, C (IOP Publishing, 2022-07)
    A class of inflationary models that involve rapid bursts of particle productions predict observational signatures, such as bump-like features in the primordial scalar power spectrum. In this work, we analyze such models ...
  • Particle production during inflation: constraints expected from redshifted 21 cm observations from the epoch of reionization 
    Naik, Suvedha Suresh; Pravabati, C; Furuuchi, Kazuyuki (IOP Publishing, 2023-04)
    We examine a type of feature in the primordial scalar power spectrum, namely, the bump-like feature(s) that arise as a result of burst(s) of particle production during inflation. The latest CMB observations by Planck ...
  • Particle Symmetries in Γ/M Ratios and the Lifetime of Proton 
    Sharma, A; Ramanna, R (World Scientific Publishing Company, 1996-09)
    In this letter it is shown that there is a close connection between the isospins of the fundamental particles and their masses and lifetimes. One of the important results is that the lifetime of the proton comes out to be ...
  • Patchy occurrence of equatorial spread-F 
    Sastri, J. H (European Geosciences Union, 1985-10)
    From a statistical analysis of ionogram data of Kodaikanal (dip 3.5 deg N) it is shown that, during years of high sunspot activity, the discontinuous or patchy occurrence of equatorial spread-F (ESF) depends on season. ...
  • Pc-scale study of radio galaxies and BL Lacs 
    Kharb, P; Shastri, P; Gabuzda, D. C (Elsevier, 2003-10)
    We study two aspects of the differences between Active Galactic Nuclei (AGN) of the two Fanaroff-Riley types in order to investigate the causes of the F-R divide. We: (a) contrast the properties of the optical cores in ...
  • A PC/AT based image data acquisition processing system for CCD cameras 
    Ananth, A. V; Srinivasan, R; Srinivasulu, G (Council of Scientific and Industrial Research, 1991-08)

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