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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Understanding galaxy mergers and AGN feedback with UVIT 
    Rubinur, K; Mousumi Das; Kharb, Preeti; Rahne, P. T (Cambridge University Press, 2021-01)
    Simulations expect an enhanced star-formation and active galactic nuclei (AGN) activity during galaxy mergers, which can lead to formation of binary/dual AGN. AGN feedback can enhance or suppress star-formation. We have ...
  • Understanding ghost interference 
    Qureshi, T; Pravabati, C; Shafaq, S (World Scientific Publishing Company, 2016-09)
    The ghost interference observed for entangled photons is theoretically analyzed using wave-packet dynamics. It is shown that ghost interference is a combined effect of virtual double-slit creation due to entanglement, and ...
  • Understanding jets from sources straddling the Fanaroff-Riley divide 
    Kharb, P; Stanley, E; Lister, M; Marshall, H; O'Dea, C; Baum, S (Cambridge University Press, 2015-03)
    Results from Chandra-HST-VLA observations of 13 hybrid sources are presented. Data from ten sources in the literature are analysed along with new data from three hybrid blazars belonging to the MOJAVE sample. Studies of ...
  • Understanding Li enhancement in K giants and role of accurate parallaxes 
    Raghubar Singh; Reddy, B. E (Cambridge University Press, 2018-07)
    Our recent studies based on a large sample of K giants with Hipparcos parallaxes and spectroscopic analysis resulted more than a dozen new Li-rich K giants including few super Lirich ones. Most of the Li-rich K giants ...
  • Understanding pulsar emission profiles from geometry and rotation effects 
    Thomas, R. M. C; Gupta, Y; Gangadhara, R. T (Astronomical Society of the Pacific, 2009-09)
    We have developed a method to locate the possible emission regions in pulsar magnetospheres, taking into account detailed effects of geometry and rotation of the neutron star. Using curvature radiation formulation, we ...
  • Understanding the effects of geometry and rotation on pulsar intensity profiles 
    Thomas, R. M. C; Gupta, Y; Gangadhara, R. T (Wiley-Blackwell, 2010-08-01)
    We have developed a method to compute the possible distribution of radio emission regions in a typical pulsar magnetosphere, taking into account the viewing geometry and rotational effects of the neutron star. Our method ...
  • Understanding the Radio Emission Geometry of Multiple-Component Radio Pulsars from Retardation and Aberration Effects 
    Gupta, Y; Gangadhara, R. T (The American Astronomical Society, 2003-02)
    We have conducted a detailed analysis of the emission geometry of a handful of radio pulsars that have prominent, multiple-component profiles at meter wavelengths. From careful determination of the total number of emission ...
  • Understanding the Radio Emission Geometry of PSR B0329+54 
    Gangadhara, R. T; Gupta, Y (American Astronomical Society, 2001-07)
    We have analyzed high-quality single-pulse data of PSR B0329+54 at 325 and 606 MHz to study the structure of the emission beam. Using the ``window-threshold technique,'' which is suitable for detecting weak emission ...
  • Understanding the secular evolution of NGC 628 using UltraViolet Imaging Telescope 
    Ujjwal, K; Kartha, Sreeja S; Subramanian, S; George, Koshy; Thomas, Robin; Mathew, Blesson (Oxford University Press on behalf of Royal Astronomical Society, 2022-10)
    Secular and environmental effects play a significant role in regulating the star-formation rate and hence the evolution of the galaxies. Since ultraviolet (UV) flux is a direct tracer of the star formation in galaxies, the ...
  • Unidentified molecular features in the red spectrum (5800 to 7300 Å) of PI Gruis 
    Murty, P. S (D.Reidel Publishing Co.,, 1982-11)
    Moderate dispersion (46 Å mm–1 at H) image-tube spectrum (5800–7300 Å) of the S star 1 Gru is found to exhibit several unidentified molecular features, in addition to the well-known bands of the oxides ofs-process elements. ...
  • Unified approach to photo- and electro-production of mesons with arbitrary spins 
    Ramachandran, G; Vidya, M. S; Balasubramanyam, J (Indian Academy of Sciences, 2007-01)
    A new approach to identify the independent amplitudes along with their partial wave multipole expansions, for photo- and electro-production is suggested, which is generally applicable to mesons with arbitrary ...
  • A unified description of anti-dynamo conditions for incompressible flows 
    Mangalam, A (Anita Publications, 2004-12)
    A general type of mathematical argument is described, which applies to all the cases in which dynamo maintenance of a steady magnetic field by motion in a uniform density is known to be impossible. Previous work has ...
  • A unified view on Aharanov-Bohm like phases and some applications 
    Unnikrishnan, C. S (Indian Academy of Sciences, 2001-03)
    The analysis of the Aharanov-Bohm phase and other similar physical effects in this paper is motivated by the philosophy that all physical changes, including phase changes, should originate in one of the local physical ...
  • The Unique Type Ib Supernova 2005bf: A WN Star Explosion Model for Peculiar Light Curves and Spectra 
    Tominaga, N; Tanaka, M; Nomoto, K; Mazzali, P. A; Deng, J; Maeda, K; Umeda, H; Modjaz, M; Hicken, M; Challis, P; Kirshner, R. P; Wood-Vasey, W. M; Blake, C. H; Bloom, J. S; Skrutskie, M. F; Szentgyorgyi, A; Falco, E. E; Inada, N; Minezaki, T; Yoshii, Y; Kawabata, K; Iye, M; Anupama, G. C; Sahu, D. K; Prabhu, T. P (The American Astronomical Society, 2005-11-10)
    Observations and modeling for the light curve (LC) and spectra of supernova (SN) 2005bf are reported. This SN showed unique features: the LC had two maxima, and declined rapidly after the second maximum, while the spectra ...
  • Universality of charge arising from torsion 
    de Sabbata, V; Sivaram, C (Springer, 1993-04)
    We show that in relating torsion to intrinsic unit of spin h, with the consideration that defects in spacetime topology occur in multiples of Planck length, the electric charge appears as a derived concept, showing its ...
  • Unraveling the Thermodynamic Enigma between Fast and Slow Coronal Mass Ejections 
    Khuntia, Soumyaranjan; Mishra, Wageesh; Mishra, Sudheer K; Wang, Yuming; Zhang, Jie; Lyu, Shaoyu (IOP Publishing, 2023-11-20)
    Coronal mass ejections (CMEs) are the most energetic expulsions of magnetized plasma from the Sun that play a crucial role in space weather dynamics. This study investigates the diverse kinematics and thermodynamic evolution ...
  • Unravelling optical and X-ray properties of the disc-dominated intermediate polar IGR J15094-6649 
    Joshi, Arti; Rawat, Nikita; Schwope, Axel; Pandey, J. C; Scaringi, Simone; Sahu, D. K; Rao, Srinivas M; Singh, Mridweeka (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)
    We present analyses of an Intermediate Polar, IGR J15094-6649, based on the archival optical data obtained from the Transiting Exoplanet Survey Satellite (TESS) and X-ray data obtained from the Suzaku, NuSTAR, and Neil ...
  • Unravelling the Components of a Multi-Thermal Coronal Loop Using Magnetohydrodynamic Seismology 
    Prasad, S. K; Jess, D. B; Klimchuk, J. A; Banerjee, D (IOP Publishing, 2017-01-10)
    Coronal loops, constituting the basic building blocks of the active Sun, serve as primary targets to help understand the mechanisms responsible for maintaining multi-million Kelvin temperatures in the solar and stellar ...
  • Unravelling the nuclear dust morphology of NGC 1365: a two-phase polar–RAT model for the ultraviolet to infrared spectral energy distribution 
    Swain, Subhashree; Shalima, P; Latha, K. V. P (Oxford University Press on behalf of Royal Astronomical Society, 2024-01)
    We present a 3D radiative transfer model for the spectral energy distribution (SED) of NGC 1365, which is a ‘changing look’ Seyfert 1.8 type active galactic nucleus (AGN). The SED from the ultraviolet (UV) to the infrared ...
  • Unravelling the post-collision properties of the Cartwheel galaxy: A MUSE exploration of its bar and inner region 
    Mondal, Chayan; Barway, Sudhanshu (EDP Sciences, 2024-01)
    Aims. We aim to investigate the characteristics of the bar and inner disc in the collisional ring galaxy Cartwheel. Methods. We used integral field unit (IFU) observations from the Multi-Unit Spectroscopic Explorer (MUSE) ...

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