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Browsing IIAP Publications by Title

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  • Triggered star formation and evolution of T-Tauri stars in and around bright-rimmed clouds 
    Chauhan, N; Pandey, A. K; Ogura, K; Ojha, D. K; Bhatt, B. C; Ghosh, S. K; Rawat, P. S (Blackwell Publishing, 2009-06)
    The aim of this paper is to quantitatively testify the `small-scale sequential star formation' hypothesis in and around bright-rimmed clouds (BRCs). As a continuation of the recent attempt by Ogura et al., we have carried ...
  • Triggered Star Formation and Young Stellar Population in Bright-rimmed Cloud SFO 38 
    Choudhury, R; Mookerjea, B; Bhatt, H. C (IOP Publishing, 2010-07-10)
    We have investigated the young stellar population in and around SFO 38, one of the massive globules located in the northern part of the Galactic H II region IC 1396, using the Spitzer IRAC and MIPS observations (3.6-24 ...
  • Triggering an eruptive flare by emerging flux in a solar active-region complex 
    Louis, R. E; Kliem, B; Ravindra, B; Chintzoglou, G (Springer, 2015-12)
    A flare and fast coronal mass ejection originated between solar active regions NOAA 11514 and 11515 on 2012 July 1 (SOL2012-07-01) in response to flux emergence in front of the leading sunspot of the trailing region 11515. ...
  • Triggering The Birth of New Cycle’s Sunspots by Solar Tsunami 
    Dikpati, M; McIntosh, S.W; Chatterjee, Subhamoy; Banerjee, D; Yellin-Bergovoy, Ron; Srivastava, A (Springer Nature, 2019-02-14)
    When will a new cycle’s sunspots appear? We demonstrate a novel physical mechanism, namely, that a “solar tsunami” occurring in the Sun’s interior shear-fluid layer can trigger new cycle’s magnetic flux emergence at high ...
  • A triple active galactic nucleus in the NGC 7733–7734 merging group 
    Yadav, Jyoti; Mousumi Das; Barway, Sudhanshu; Combes, Francoise (EDP Sciences, 2021-07)
    Context. Galaxy interactions and mergers can lead to supermassive black hole (SMBH) binaries, which become active galactic nucleus (AGN) pairs when the SMBHs start accreting mass. If there is a third galaxy involved in the ...
  • The truth behind the legend: European doctors in pre-colonial India 
    Kochhar, R (Indian Academy of Sciences, 1999-09)
    The aim of this article is to point out that the medical history of India in the seventeenth century needs to be studied for its bearing on the history of medical science in this country. During the period 1644–1717, ...
  • Turbulent Density Fluctuations and Proton Heating Rate in the Solar Wind from 9-20 R 
    Sasikumar Raja, K; Subramanian, P; Ramesh, R; Vourlidas, Angelos; Ingale, M (IOP Publishing, 2017-12)
    We obtain scatter-broadened images of the Crab Nebula at 80 MHz as it transits through the inner solar wind in 2017 and 2016 June. These images are anisotropic, with the major axis oriented perpendicular to the radially ...
  • Turbulent magnetic field averages for the Zeeman effect 
    Frisch, H; Sampoorna, M; Nagendra, K. N (Societa Astronomica Italiana, 2007)
    Stokes parameters measured in the Solar atmosphere are in general time or space averages over a magnetic field probability distribution function. Here we show how to write the Zeeman propagation matrix in a reference ...
  • A Turbulent model of the solar granulation 
    Krishan, V (World Scientific Publishing Company, 1995)
    The turbulent nature of the motions on the solar photosphere is being emphasized more and more by the high resolution quality observations. The processes of inverse cascade of energy in a turbulent medium are being ...
  • Turbulent proton heating rate in the solar wind from 5–45 R⊙ 
    Sasikumar Raja, K; Subramanian, P; Ingale, M; Ramesh, R; Maksimovic, Milan (IOP Publishing, 2021-06-20)
    Various remote sensing observations have been used so far to probe the turbulent properties of the solar wind. Using the recently reported density modulation indices that are derived using angular broadening observations ...
  • TW Hya: Spectral Variability, X-Rays, and Accretion Diagnostics 
    Dupree, A. K; Brickhouse, N. S; Cranmer, S. R; Luna, G. J. M; Schneider, E. E; Bessell, M. S; Bonanos, A; Crause, L. A; Lawson, W. A; Mallik, S. V; Schuler, S. C (IOP Publishing, 2012-05-01)
    The nearest accreting T Tauri star, TW Hya was intensively and continuously observed over ~17 days with spectroscopic and photometric measurements from four continents simultaneous with a long segmented exposure using the ...
  • Twenty five years of observational astronomy at the Indian Institute of Astrophysics 
    Mallik, D. C. V (Indian Academy of Sciences, 1998-05)
  • The twin radio galaxy TRG J104454+354055 
    Gopal-Krishna; Joshi, Ravi; Patra, Dusmanta; Yang, Xiaolong; Ho, Luis C; Wiita, Paul J; Omar, Amitesh (Oxford University Press on behalf of Royal Astronomical Society, 2022-07)
    We report observations of a bright dumb-bell system of galaxies (z = 0.162) with the upgraded Giant Metrewave Radio Telescope (uGMRT), which show that each member of this gravitationally bound pair of galaxies hosts bipolar ...
  • Twin Telescope observations of the Sun at Kodaikanal Observatory 
    Singh, J; Ravindra, B (Astronomical Society of India, 2012-03)
    We report the design, fabrication and installation of a ‘Twin Telescope’ at Kodaikanal Observatory intended to augment the ongoing synoptic observations of the Sun that have been carried out since 1904. The telescope uses ...
  • Twisting/Swirling Motions during a Prominence Eruption as Seen from SDO/AIA 
    Pant, V; Datta, A; Banerjee, D; Chandrashekhar, K; Ray, S (IOP Publishing, 2018-06-10)
    A quiescent prominence was observed at the northwest limb of the Sun using different channels of the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. We report and analyze twisting/swirling motions ...
  • Twistors, torsion and quantization of space-time 
    Sabbata, V; Sivaram, C (Springer, 1996-04)
    The analogies between twistors and torsion are developed. TheSL(2,C) group of transformations is used to suggest a unified link between the approaches. The role of space-time defects in the quantization of space-time is ...
  • Two Colour Photoelectric observations of the eclipsing variable UW Canis Majoris 
    Doss, A. T (Kodaikanal Observatory, 1967-01)
    Photoelectric light curves of the eclipsing binary UW Canis Majoris have been obtained in the blue and yellow. A new ephemeris is given for the system. The depth of the primary minimum is about 0/supm/.45 in B and 0/supm/.47 ...
  • The two components in the distribution of sunspot groups with respect to their maximum areas 
    Gokhale, M. H; Sivaraman, K. R (Springer, 1981-12)
    From an analysis of the distribution of sunspot groups with respect to their maximum areas we find that this distribution consists of two distinct components. One component contributes to spot groups of all possible values ...
  • The two components of the solar activity cycle as a consequence of the shock transition model of the solar magnetic cycle 
    Gokhale, M. H (Indian Institute of Astrophysics, 1979-11)
    Justification is given for comparing the consequences of the shock transition model of the solar magnetic cycle with important observed properties of the solar activity cycle without waiting for the basic postulates of the ...
  • Two longitudinal zones of apparent inhibition of sunspots on the solar disc 
    Chidambara Ayyar, P. R (Government Observatory, Madras, 1932-07-26)

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