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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Momentary bursts of cosmic radiation 
    Das, A. K; Narayana, J. V (The Manager of Publications, 1960-01)
  • Mond, dark matter and the cosmological constant 
    Sivaram, C (Springer, 1994-09)
    A possible connection between MOND (Modification of Newtonian Dynamics) proposed as an alternative hypothesis to dark matter in galaxies and clusters and a residual cosmological constant term dominating cosmological dynamics ...
  • MOND, MONG, MORG as alternatives to dark matter and dark energy, and consequences for cosmic structures 
    Sivaram, C; Arun, Kenath; Rebecca, Louise (Indian Academy of Sciences, 2020-02)
    In view of the negative results from various dark matter detection experiments, we propose alternate models by postulating a minimal field strength (minimal curvature) and also a minimal acceleration. These postulates ...
  • MONG: An extension to galaxy clusters 
    Rebecca, Louise; Kenath, Arun; Sivaram, C (World Scientific Publishing, 2022-04-30)
    The presence of dark matter (DM), though well established by indirect evidence, is yet to be observed directly. Various DM detection experiments running for several years have yielded no positive results. In view of these ...
  • Monopole annihilation and highest energy cosmic rays 
    Bhattacharjee, P; Sigl, G (The American Physical Society, 1995-04)
    Cosmic rays with energies exceeding 1020 eV have been detected. The origin of these highest energy cosmic rays remains unknown. Established astrophysical acceleration mechanisms encounter severe difficulties in accelerating ...
  • More insights into bar quenching: Multi-wavelength analysis of four barred galaxies 
    George, K; Joseph, P; Mondal, C; Subramanian, S; Subramaniam, A; Paul, K. T (EDP Sciences, 2020-12)
    The underlying nature of the process of star formation quenching in the central regions of barred disc galaxies that is due to the action of stellar bar is not fully understood. We present a multi-wavelength study of four ...
  • Morpho-kinematic and photoionization models of the multipolar structures in planetary nebula NGC 6572 
    Bandyopadhyay, Rahul; Das, Ramkrishna; Parthasarathy, M; Kar, Subhajit (Oxford University Press on behalf of Royal Astronomical Society, 2023-09)
    We have studied planetary nebula (PN) NGC 6572 through 3D morpho-kinematic and photoionization modelling. The 3D morphology is reconstructed from the Hubble Space Telescope images in different narrow-band filters and ...
  • Morphologies in megaparsec-size powerful radio galaxies 
    Subrahmanyan, R; Saripalli, L; Hunstead, R. W (Royal Astronomical Society, 1996-03)
    We present radio images with the Australia Telescope of a sample of powerful radio galaxies. The observations were designed to be sensitive to the largest-scale structures in the radio sources. The morphologies are ...
  • Morphologies in Mpc-Size Radio Galaxies 
    Saripalli, L; Subrahmanyan, R; Hunstead, R. W (International Astronomical Union, 1996)
  • Morphology of 21cm brightness temperature during the Epoch of Reionization using Contour Minkowski Tensor 
    Akanksha, K; Pravabati, C; Appleby, S (IOP Publishing, 2019-09)
    We use morphological descriptors, Betti numbers and Contour Minkowski Tensor (CMT) on 21cm brightness temperature excursion sets, to study the ionization and heating history of the intergalactic medium (IGM) during and ...
  • Morphology of CMB fields—effect of weak gravitational lensing 
    Goyal, Priya; Pravabati, C; Appleby, S (IOP Publishing, 2020-02)
    We study the morphology of the cosmic microwave background temperature and polarization fields using the shape and alignment parameters, β and α, that are constructed from the contour Minkowski tensor. The primary goal of ...
  • Morphology of H-alpha filaments and filament channel systems 
    Makarov, V. I; Stoianova, M. N; Sivaraman, K. R (Indian Academy of Sciences, 1982-12)
    The results of a study of the morphology of the large-scale filament structures of the sun and their relations with the distribution of the large-scale magnetic field on the solar surface are reported. A continuous filament ...
  • Morphology of the bipolar planetary nebula NGC 2346 from emission line profile studies 
    Anandarao, B. G; Banerjee, D. P. K; Desai, J. N; Jain, S. K; Mallik, D. C. V (Royal Astronomical Society, 1988-11)
    High resolution observations of H-alpha 6563-A, forbidden O-III 5007 A, and forbidden N-II 6583-A emission lines in the bipolar planetary nebula NGC 2346 are presented. From the widths of the alpha and forbidden N-II lines, ...
  • Motion of a particle in the background of a white hole 
    Kapoor, R. C (Indian Institute of Astrophysics, 1979-11)
    A study has been made of the motion of a test particle in the background of a white hole particularly from the view point of its visibility to an observer at infinity. It is shown that radial as well as non-radial photons ...
  • The motion of gases in the sun's atmosphere: Part IV On the occurrence of highly stripped atoms in the corona 
    Das, A. K; Paramasiva Rao, Y (Indian Association for the Cultivation of Science, 1942-10)
  • Movements in the F region of the Ionosphere during Solar Eclipses 
    Bhargava, B. N; Subrahmanyan, R. V (Indian Meteorological Department, 1960)
    F layer ionospheric data collected during the partial solar eclipses of 20 June and 14 December 1955 have been analysed. In order to study the effects of the eclipses at several heights, the electron density height profiles ...
  • Moving groups in the galactic disc 
    Ramya, P; Reddy, B. E (Cambridge University Press, 2014-01)
    We present results of chemical abundance study of a few representative stellar streams of Galactic thick and thin discs. Arcturus stream, which was proposed to have an extragalactic origin, and a recently detected stream ...
  • The Multi Application Solar Telescope 
    Venkatakrishnan, P; Mathew, S. K; Srivastava, N; Bayanna, A. R; Kumar, B; Ramya, B; Jain, N; Saradava, M (Current Science Association, 2017-08)
    Multi Application Solar Telescope (MAST), a telescope for the detailed study of solar activity, was operationalized at the Udaipur Solar Observatory (USO) of Physical Research Laboratory (PRL), on 16 June 2015. This ...
  • Multi-band behaviour of the TeV blazar PG 1553+113 in optical range on diverse timescales 
    Agarwal, A; Mihov, B; Andruchow, I; Cellone, S. A; Anupama, G. C; Agrawal, V; Zola, S; Slavcheva, L; Slavcheva-Mihova, L; Ozdonmez, A; Ege, Ergun; Raj, A; Mammana, L; Zibecchi, L; Fernandez-Lajus, E (EDP Sciences, 2021-01)
    Context. The TeV BL Lac object PG 1553+113 is one of the primary candidates for a binary supermassive black hole system. Aims. We study the flux and spectral variability of PG 1553+113 on intra-night to long-term ...
  • Multi-band Observations of Gamma Ray Bursts 
    Bhargavi, S. G (Indian Academy of Sciences, 2002-06)
    This talk focuses on the various aspects we learnt from multiband observations of GRBs both, before and during the afterglow era. A statistical analysis to estimate the probable redshifts of host galaxies using the luminosity ...

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