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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Constraining cosmological parameters through Sunyaev-Zel'dovich surveys 
    Majumdar, S; Subrahmanyan, R (Indian Academy Of Sciences, 1999-12)
    For cold dark matter models, images of temperature fluctuations in the cosmic microwave background (CMB), due to Sunyaev Zel'dovich (SZ) effect have been been simulated taking a cosmological distribution of clusters into ...
  • Constraining the parameters of globular cluster NGC 1904 from its variable star population 
    Kains, N; Bramich, D. M; Figuera Jaimes, R; Arellano Ferro, A; Giridhar, S; Kuppuswamy, K (EDP Sciences, 2012-12)
    Aims. We present the analysis of 11 nights of V and I time-series observations of the globular cluster NGC 1904 (M 79). Using this we searched for variable stars in this cluster and attempted to refine the periods of known ...
  • Constraining the solar coronal magnetic field strength using split-band type ii radio burst observations 
    Kishore, P; Ramesh, R; Hariharan, K; Kathiravan, C; Gopalswamy, N (IOP Publishing, 2016-11-20)
    We report on low-frequency radio (85–35 MHz) spectral observations of four different type II radio bursts, which exhibited fundamental-harmonic emission and split-band structure. Each of the bursts was found to be closely ...
  • Constraint on noncommutative spacetime from PLANCK data 
    Joby, P. K; Pravabati, C; Das, Subinoy (The American Physical Society, 2015-04)
    We constrain the energy scale of noncommutativity of spacetime using cosmic microwave background data from PLANCK. We find that PLANCK data put the lower bound on the noncommutativity energy scale to about 20 TeV, which ...
  • Constraints of the Physics of Low-Mass AGB Stars from CH and CEMP Stars 
    Cristallo, S; Karinkuzhi, D; Goswami, A; Piersanti, L; Gobrecht, D (IOP Publishing, 2016-12-20)
    We analyze a set of published elemental abundances from a sample of CH stars which are based on high resolution spectral analysis of ELODIE and SUBARU/HDS spectra. All the elemental abundances were derived from local ...
  • Constraints on cosmic electric charge asymmetry and neutrino charge from the microwave background 
    Sengupta, S; Pal, B. P (Elsevier B.V, 1996-01)
    We point out that an overall electric charge asymmetry in the universe will generate an anisotropy in the cosmic microwave background radiation (CMBR) via the Sach-Wolfe effect. From this, an upper limit on the electric ...
  • Constraints on dark matter density and axion mass from the largescale structure of spacetime 
    Joshi, P. S; Datta, B (International Astronomical Union, 1987)
  • Constraints on dark matter models from the observation of Triangulum-II with the Fermi Large Area Telescope 
    Biswas, Sayan; Bhattacharjee, P; Majumdar, P; Das, Subinoy; Mousumi Das; Joarder, P. S (IOP Publishing, 2017-11)
    Triangulum-II, a newly discovered dwarf spheroidal galaxy, is a strong candidate for the indirect search of dark matter through the detection of γ -ray emission that could originate from the pair- annihilation ...
  • Constraints on dark matter scenarios from measurements of the galaxy luminosity function at high redshifts 
    Corasaniti, P. S; Agarwal, S; Marsh, D. J. E; Das, Subinoy (The American Physical Society, 2017-04-15)
    We use state-of-the-art measurements of the galaxy luminosity function (LF) at z = 6, 7, and 8 to derive constraints on warm dark matter (WDM), late-forming dark matter, and ultralight axion dark matter models alternative ...
  • Constraints on dynamo action 
    Mangalam, A (Springer Netherlands, 2008)
    We discuss first geometrical constraints on dynamo action. Magnetic field decay is unavoidable under certain conditions of symmetry. These known results are encompassed by a calculation for flows described in terms of a ...
  • Constraints on stellar grain formation from presolar graphite in the murchison meteorite 
    Bernatowicz, T. J; Cowsik, R; Gibbons, P. C; Lodders, K; Fegley, B. Jr; Amari, S; Lewis, R. S (American Astronomical Society, 1996-12)
    We report the results of isotopic, chemical, structural, and crystallographic microanalyses of graphitic spherules (0.3-9 μm) extracted from the Murchison meteorite. The spherules have sup12C/sup13C ratios ranging over 3 ...
  • Constraints on structure formation models from the Sunyaev-Zel'dovich effect 
    Majumdar, S; Subrahmanyan, R (Royal Astronomical Society, 2000-03)
    In the context of cold dark matter (CDM) cosmological models, we have simulated images of the brightness temperature fluctuations in the cosmic microwave background (CMB) sky owing to the Sunyaev–Zel'dovich (S–Z) effect ...
  • Constraints on the epoch of dark matter formation from Milky Way satellites 
    Das, Subinoy; Nadler, E. O (The American Physical Society, 2021-02-15)
    A small fraction of thermalized dark radiation that transitions into cold dark matter (CDM) between big bang nucleosynthesis and matter-radiation equality can account for the entire dark matter relic density. Because of ...
  • Constraints on the evolution of the Triton atmosphere from occultations: 1989–2022 
    Sicardy, B; Tej, A; Gomes-Júnior, A. R; Romanov, F. D; Bertrand, T; Ashok, N. M; Lellouch, E; Morgado, B. E; Assafin, M; Desmars, J; Camargo, J. I. B; Kilic, Y; Ortiz, J. L; Vieira-Martins, R; Braga-Ribas, F; Ninan, J. P; Bhatt, B. C; Pramod Kumar, S; Swain, V; Sharma, S; Saha, A; Ojha, D. K; Pawar, G; Deshmukh, S; Deshpande, A; Ganesh, S; Jain, J. K; Mathew, S. K; Kumar, H; Bhalerao, V; Anupama, G. C; Barway, Sudhanshu; Brandeker, A; Floren, H. G; Olofsson, G; Bruno, G; Mao, Y. M; Ye, R. H; Zou, Q. Y; Sun, Y. K; Shen, Y. Y; Zhao, J. Y; Grishin, D. N; Romanova, L. V; Marchis, F; Fukui, K; Kukita, R; Benedetti-Rossi, G; Santos-Sanz, P; Dhyani, N; Gokhale, A; Kate, A (EDP Sciences, 2024-02)
    Context. In about 2000, the south pole of Triton experienced an extreme summer solstice that occurs every ∼650 years, when the subsolar latitude reached about 50°S. Bracketing this epoch, a few occultations probed the ...
  • Constraints on the neutrino magnetic moment from stellar evolution and supernovae type Ia 
    Sivaram, C (University of Calgary, 1993)
    There are several interesting consequences of a neutrino magnetic moment(NMM) such as possibility of a time varying solar neutrino signal (ENS), increased cooling of red giants and enhanced evolution of horizontal branch ...
  • Construction of a 57m hypertelescope in the southern Alps 
    Labeyrie, A; Allouche, F; Mourard, D; Bolgar, F; Chakraborthy, R; Maillot, J; Palitzyne, N; Poletti, J. R; Rochaix, J. P; Prud homme, R; Rondi, A; Roussel, M; Arun Surya (SPIE--The International Society for Optical Engineering, 2012-09)
    For information-rich direct images at high resolution, hypertelescopes combine light from a sparse array of many subapertures, using pupil densi cation. Among the possible architectures, the Arecibo-like spherical class has ...
  • The contagion of star-formation: its origin 
    Anathpindika, S (Astronomical Society of India, 2012)
    Dense pockets of cold, molecular gas preclude the formation of stars. During their infancy and later phases of evolution, stars inject considerable energy into the interstellar medium by driving shocks either due to ionising ...
  • Contamination control of UVIT 
    Kathiravan, S; Tandon, S. N; Prasad, B. R; Sriram, S; Pradeep, A; Vishnu, T; Mahesh, P. K; Kamath, P. U; Nagabhushana, S; Amit Kumar (Indian Academy of Sciences, 2021-10)
    Ultra Violet Imaging Telescope (UVIT) is one of the 5 instruments on AstroSat satellite, which was launched on September 28, 2015. UVIT was designed to make images with a resolution of <1.8′′, simultaneously in two ultraviolet ...
  • Contemporary deformation in the Kashmir–Himachal, Garhwal and Kumaon Himalaya: significant insights from 1995–2008 GPS time series 
    Jade, S; Mukul, M; Gaur, V. K; Kumar, K; Shrungeshwar, T. S; Satyal, G. S; Dumka, R. K; Jagannathan, S; Ananda, M. B; Dileep Kumar, P; Banerjee, S (Springer, 2014-06)
    We present new insights on the time-averaged surface velocities, convergence and extension rates along arc-normal transects in Kumaon, Garhwal and Kashmir–Himachal regions in the Indian Himalaya from 13 years of high-precision ...
  • Continuum radiation due to collective plasma process in quasars 
    Gangadhara, R. T; Krishan, V (Indian Association for the Cultivation of Science, 1992)

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