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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Milliarcsec-scale radio structure of a matched sample of Seyfert 1 and Seyfert 2 galaxies 
    Lal, D. V; Shastri, P; Gabuzda, D. C (EDP Sciences, 2004-10)
    We have obtained mas-scale resolution very long baseline interferometry (VLBI) images of a sample of Seyfert 1 and Seyfert 2 galaxies at 5 GHz (wavelength, lamda = 6 cm). The Seyferts of the two types were chosen to be ...
  • Millisecond pulsar emission altitude from relativistic phase shift: PSR J0437-4715 
    Gangadhara, R. T; Thomas, R. M. C (Springer Netherlands, 2008)
    We have analyzed the profile of the millisecond pulsar PSR J0437-4715 at 1440 MHz by fitting the Gaussians to pulse components, and identified its 11 emission components. We propose that they form a emission beam with 5 ...
  • A mini ACT experiment at low and high altitudes 
    Vishwanath, P. R; Acharya, B. S; Bhat, P. N; Chitnis, V. R (Tata Institute of Fundamental Research, 2005)
    A simple experimental apparatus was used to measure rate of cosmic ray events due to Atmospheric Cerenkov Radiation at two mountain altitude sites with the height difference of 3.5 km. The event rates at Hanle (altitude ...
  • A minimal space interferometer configuration for imaging at low radio frequencies 
    Jaini, Akhil; Deshpande, Avinash A; Bitragunta, Sainath (Cambridge University Press, 2021-08)
    The radio sky at lower frequencies, particularly below 20 MHz, is expected to be a combination of increasingly bright non-thermal emission and significant absorption from intervening thermal plasma. The sky maps at these ...
  • A minimal time and time-temperature uncertainty principle 
    de Sabbata, V; Sivaram, C (Springer, 1992-04)
    We show that introducing torsion in general relativity, that is, physically, considering the effect of the spin and linking the torsion to defects in spacetime topology, we can have a minimal unit of time. Also an uncertainty ...
  • Minimum Relative Entropy Method - Solution to Missing Short Baseline Problem 
    Shevgaonkar, R. K (Indian Academy of Sciences, 1986-12)
    The minimum-relative-entropy method (MREM) is proposed as a solution to the missing short-baseline problem in radio synthesis observations. It is shown that a measure of distance between the prior model and the image in ...
  • Minkowski Tensors in Redshift Space—Beyond the Plane-parallel Approximation 
    Appleby, Stephen; Kochappan, Joby P; Pravabati, C; Park, Changbom (American Astronomical Society, 2023-01-10)
    The Minkowski tensors (MTs) can be used to probe anisotropic signals in a field, and are well suited for measuring the redshift-space distortion (RSD) signal in large-scale structure catalogs. We consider how the linear ...
  • Minkowski tensors in three dimensions: probing the anisotropy generated by redshift space distortion 
    Appleby, S; Pravabati, C; Park, C; Yogendran, K. P; Joby, P. K (IOP Publishing, 2018-08)
    We apply the Minkowski tensor statistics to three-dimensional Gaussian random fields. Minkowski tensors contain information regarding the orientation and shape of excursion sets that is not present in the scalar Minkowski ...
  • Minkowski Tensors in Two Dimensions: Probing the Morphology and Isotropy of the Matter and Galaxy Density Fields 
    Appleby, S; Pravabati, C; Park, C; Hong, S. E; Kim, J; Vidhya, G (IOP Publishing, 2018-05-10)
    We apply the Minkowski tensor statistics to two-dimensional slices of the three-dimensional matter density field. The Minkowski tensors are a set of functions that are sensitive to directionally dependent signals in the ...
  • Minor planets and planetary rings 
    Bhattacharyya, J. C (Centre of Advanced Study in Astronomy Osmania University, 1984)
    Circumstances of the discovery of the first asteroid and the characteristics of various orbits followed by them have been discussed. Their shapes, compositions and evolutionary histories so far known have also been described. ...
  • Minutes-duration optical flares with supernova luminosities 
    Ho, Anna Y. Q; Perley, Daniel A; Chen, Ping; Schulze, Steve; Dhillon, Vik; Kumar, Harsh; Suresh, Aswin; Swain, Vishwajeet; Bremer, Michael; Smartt, Stephen J; Anderson, Joseph P; Anupama, G. C; Awiphan, Supachai; Barway, Sudhanshu; Bellm, Eric C; Ben-Ami, Sagi; Bhalerao, Varun; de Boer, Thomas; Brink, Thomas G; Burruss, Rick; Chandra, Poonam; Chen, Ting-Wan; Chen, Wen-Ping; Cooke, Jeff; Coughlin, Michael W; Das, Kaustav K; Drake, Andrew J; Filippenko, Alexei V; Freeburn, James; Fremling, Christoffer; Fulton, Michael D; Gal-Yam, Avishay; Galbany, Lluís; Gao, Hua; Graham, Matthew J; Gromadzki, Mariusz; Gutierrez, Claudia P; Hinds, K. -Ryan; Inserra, Cosimo; Nayana, A. J; Karambelkar, Viraj; Kasliwal, Mansi M; Kulkarni, Shri; Muller-Bravo, Tomas E; Magnier, Eugene A; Mahabal, Ashish A; Moore, Thomas; Ngeow, Chow-Choong; Nicholl, Matt; Ofek, Eran O; Omand, Conor M. B; Onori, Francesca; Pan, Yen-Chen; Pessi, Priscila J; Petitpas, Glen; Polishook, David; Poshyachinda, Saran; Pursiainen, Miika; Riddle, Reed; Rodriguez, Antonio C; Rusholme, Ben; Segre, Enrico; Sharma, Yashvi; Smith, Ken W; Sollerman, Jesper; Srivastav, Shubham; Strotjohann, Nora Linn; Suhrx, Mark; Svinkin, Dmitry; Wang, Yanan; Wiseman, Philip; Wold, Avery; Yang, Sheng; Yang, Yi; Yao, Yuhan; Young, David R; Zheng, WeiKang (Springer Nature, 2023-11-30)
    In recent years, certain luminous extragalactic optical transients have been observed to last only a few days1. Their short observed duration implies a different powering mechanism from the most common luminous extragalactic ...
  • Misaligned Jets from Sgr A* and the Origin of Fermi/eROSITA Bubbles 
    Sarkar, Kartick C; Mondal, Santanu; Sharma, Prateek; Piran, Tsvi (American Astronomical Society, 2023-07-01)
    One of the leading explanations for the origin of Fermi Bubbles is past jet activity in the Galactic center supermassive black hole Sgr A*. The claimed jets are often assumed to be perpendicular to the Galactic plane. ...
  • Mode classification and wave propagation in a magnetically structured medium 
    Hasan, S. S; Sobouti, Y (Blackwell, 1987-09)
    The authors examine the structure of motions that can occur in a vertical magnetic flux tube with a rectangular cross-section. A polytropic stratification is assumed in the vertical direction. The authors use a gauged ...
  • A model for relativistic disk emission, flow and variability 
    Mohan, Prashanth; Mangalam, A (Astronomical Society of India, 2015-04)
    Orbiting features near a black hole can cause variability in optical/UV and X-ray bands with quasi-periodic signatures. The variable flux is derived in Kerr geometry including the following relativistic effects: light ...
  • A Model for Simulating Realistic Profiles of Pulsars 
    Thomas, R. M. C; Gupta, Y; Gangadhara, R. T (American Institute of Physics, 2011-08)
    We devise an accurate method to compute the emission profile corresponding to a given set of pulsar emission parameters, for eg. inclination angle alpha, impact angle beta, frequency of emission omega, Lorentz factor gamma, ...
  • A Model for the Extended Dust Shell around the Supergiant R Coronae Borealis 
    Nagendra, K. N; Leung, C. M (American Astronomical Society, 1990)
  • A model for the millisecond pulsar PSR 1937 + 214 
    Kochhar, R. K; Sivaram, C (Springer, 1984-01)
    The authors suggest a model for the millisecond pulsar PSR 1937+214, according to which the immediate progenitor of the pulsar was a binary consisting of two neutron stars of unequal mass. The heavier neutron star was spun ...
  • Model for the relationship of granulation and supergranulation 
    Krishan, V (The University of Arizona Press, 1991)
    In this report a mechanism is proposed for producing the observed solar supergranulation from the photospheric granulation by a dissipative decay of two-dimensional turbulence, which leads to concentration of the energy ...
  • Model of 'steady' Parts of Rotation and Magnetic Field in the Sun's Convection Zone 
    Hiremath, K. M; Gokhale, M. H (European Space Agency, 1995-06)
    We present a preliminary model of the ‘steady’ parts of rotation and magnetic field in the sun’s convective envelope, which vary on diffusion time scales, within the frame work of axisymmetric incompressible hydromagnetics ...
  • Model of a fluxtube with a twisted magnetic field in the stratified solar atmosphere 
    Sen, Samrat; Mangalam, A (Elsevier B.V, 2018-01-15)
    We build a single vertical straight magnetic fluxtube spanning the solar photosphere and the transition region which does not expand with height. We assume that the fluxtube containing twisted magnetic fields is in ...

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