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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Toward a revival of stellar intensity interferometry 
    LeBohec, S; Barbieri, C; Willem-Jan, de W; Dravins, D; Feautrier, P; Foellmi, C dric; Glindemann, A; Hall, J; Holder, J; Holmes, R; Kervella, P; Kieda, D; Le Coarer, E; Lipson, S; Malbet, F; More, S. B; Nu ez, P; Ofir, A; Ribak, E; Saha, S. K; Schoeller, M; Zhilyaev, B; Zinnecker, H (SPIE The International Society for Optical Engineering, 2008)
    Building on technological developments over the last 35 years, intensity interferometry now appears a feasible option by which to achieve diffraction-limited imaging over a square-kilometer synthetic aperture. Upcoming ...
  • Toward precision radial velocity measurements using Echelle spectrograph at VainuBappu Telescope 
    Chamarthi, Sireesha; Banyal, R. K; Sriram, S (SPIE-The International Society for Optical Engineering, 2019-04)
    The Echelle spectrograph operating at Vainu Bappu Telescope is a general purpose instrument designed for high-resolution spectroscopy. It is being considered for precision Doppler measurements without altering the existing ...
  • Towards a unification of the parameters underlying elementary particles and cosmology 
    Sivaram, C (Springer, 1982-12)
    It is pointed out that the gross parameters characterizing the universe such as the overall size and mass can be arrived at from microphysical considerations involving the fundamental interactions of elementary particle ...
  • Towards Gender Equity in Indian Astronomy 
    Beri, Aru; Shastri, Prajval; Banyal, R. K; Chatterjee, Debarati; Chatterjee, Ritaban; Jassal, Harvinder; Kanekar, Nissim; Kharb, Preeti; Misra, Kuntal (2023-11)
    The Working Group for Gender Equity (WGGE) was formally constituted under the Astronomical Society of India (ASI) in 2015 to increase awareness about gender-related issues in the astrophysics community. The current ...
  • Towards gender equity in physics in India: initiatives, investigations, and questions 
    Shastri, P; Kurup, A; Resmi, L; Ramaswamy, R; Ubale, S; Bagchi, S; Rao, S; Narasimhan, S (AIP Publishing, 2015-12)
    Initiatives towards gender parity in the sciences in India have occurred both at national, governmental levels and at local, institutional levels. A gender gap persists in physics, but data suggest that ...
  • Towards Low Cost turbulence generator for AO testing: Utility, control and stability 
    Roopashree, M. B; Vyas, A; Krishnan, S. M; Sriram, R; Siva Shankar Sai, S; Prasad, B. R (Optical Society of America, 2011-07)
    We demonstrate and characterize an effective, statistically repeatable atmospheric turbulence generator with the aim of testing a 2m class telescope adaptive optics system in a cost effective manner.
  • Towards new analysis of Gamma-Ray sources at HImalayan Gamma-Ray Observatory (HIGRO) in northern India 
    Britto, R. J; Acharya, B. S; Anupama, G. C; Bhatt, N; Bhattacharjee, P; Bhattacharya, S; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Koul, R; Mahesh, P. K; Mitra, A; Nagesh, B. K; Parmar, N. K; Prabhu, T. P; Rannot, R. C; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tickoo, A. K; Tsewang, D; Upadhya, S. S; Vishwanath, P. R; Yadav, K. K (French Society of Astronomy and Astrophysics, 2010-12)
    The High Altitude GAmma-Ray (HAGAR) array is a wavefront sampling array of 7 telescopes, set-up at Hanle, at 4270 m a.s.l., in the Ladakh region of the Himalayas (North India). It constitutes the first phase of the HImalayan ...
  • Towards the development of the Infrared Guide Star Catalogue for the adaptive optics observations by the Thirty Meter Telescope 
    Shah, Sarang; Subramanian, S; Anupama, G. C; Delgado, Francisco; Gillies, Kim; Maheswar, G; Narayanan, Rajalakshmi; Ramaprakash, A. N; Rao, Suhasini; Reddy, B. E; Skidmore, Warren; Sivarani, T; Subramaniam, A (SPIE-The International Society for Optical Engineering, 2022-08)
    At first light, the NIR instruments of TMT will be assisted by a multi-conjugate adaptive optics instrument, known as the Narrow Field Infrared Adaptive Optics System (NFIRAOS). NFIRAOS will use laser guide stars for ...
  • Tracing the Dynamical Mass in Galaxy Disks Using H i Velocity Dispersion and Its Implications for the Dark Matter Distribution in Galaxies 
    Mousumi Das; McGaugh, S. S; Ianjamasimanana, Roger; Schombert, James; Dwarakanath, K. S (IOP Publishing, 2020-01-20)
    We present a method to derive the dynamical mass of face-on galaxy disks using their neutral hydrogen (H i) velocity dispersion (σ H i ). We have applied the method to nearby, gas-rich galaxies that have extended H i gas ...
  • Tracing the evolution of ultraluminous infrared galaxies into radio galaxies with low frequency radio observations 
    Nandi, S; Mousumi Das; Dwarakanath, K. S (Oxford University Press on behalf of the Royal Astronomical Society, 2021-06)
    We present radio observations of ultraluminous infrared galaxies (ULIRGs) using the Giant Metrewave Radio Telescope (GMRT) and combine them with archival multifrequency observations to understand whether ULIRGs are the ...
  • Tracing the magnetic field morphology of the LDN 1172/1174 cloud complex 
    Saha, Piyali; Maheswar, G; Sharma, Ekta; Lee, Chang Won; Ghosh, Tuhin; Kim, Shinyoung (EDP Sciences, 2021-11)
    Context. The LDN 1172/1174 cloud complex in the Cepheus Flare region presents a hub-filament structure with the reflection nebula, NGC 7023, illuminated by a Herbig Be star, HD 200775, which consists of the hub with a ~5 ...
  • Tracing the outer disk of NGC 300: an ultraviolet view 
    Mondal, Chayan; Subramaniam, A; George, K (Indian Academy of Sciences, 2019-07-11)
    We present an ultra-violet (UV) study of the galaxy NGC 300 using GALEX far-UV (FUV) and near-UV (NUV) observations. We studied the nature of UV emission in the galaxy and correlated it with optical, H I and mid-infrared ...
  • Tracing young star-forming clumps in the nearby flocculent spiral galaxy NGC 7793 with UVIT imaging 
    Mondal, Chayan; Subramaniam, A; George, Koshy; Postma, Joseph E; Subramanian, S; Barway, Sudhanshu (IOP Publishing, 2021-03-10)
    Star formation in galaxies is a hierarchical process with a wide range of scales, from smaller clusters to larger stellar complexes. Here, we present an ultra-violet imaging study of the nearby flocculent spiral galaxy NGC ...
  • Tracking galaxy evolution through low-frequency radio continuum observations using SKA and citizen-science research using multi-wavelength data 
    Hota, A; Konar, C; Stalin, C. S; Vaddi, Sravani; Mohanty, Pradeepta K; Dabhade, Pratik; Arun, Sai; Bhoga, Dharmik; Rajoria, Megha; Sethi, Sagar (Indian Academy of Sciences, 2016-12)
    We present a brief review of progress in the understanding of general spiral and elliptical galaxies, through merger, star formation and AGN activities. With reference to case studies performed with the GMRT, we highlight ...
  • Tracking the evolution of Lithium in giants using asteroseismology: super-Li-rich stars are almost exclusively young red-clump stars 
    Raghubar Singh; Reddy, B. E; Campbell, S. W; Bharat Kumar, Y; Vrard, Mathieu (IOP Publishing, 2021-05-20)
    We report novel observational evidence on the evolutionary status of lithium-rich giant stars by combining asteroseismic and lithium abundance data. Comparing observations and models of the asteroseismic gravity-mode period ...
  • Transient 1/f noise 
    Sinha, S (The American Physical Society, 1996-05)
    We provide examples of transient (nonasymptotic) ``1/f noise,'' occurring over reasonably long time scales, in extended nonlinear systems modeling complex spatiotemporal phenomena. These studies contribute towards establishing ...
  • Transient activity in the loop prominence system of a flare active region 
    Bagare, S. P; Nagabhushana, B. S; Aleem, P. S. M (Astronomical Society of Indian, 1989-09)
    Solar limb observations of the activity in a loop prominence system associated with an active region were obtained on February 2, 1984. The activity was observed for a total duration of over seven hours of which the maximum ...
  • Transient composite electric field disturbances near dip equator associated with auroral substorms 
    Sastri, J. H; Ramesh, K. B; Rao, H. N. R (American Geophysical Union, 1992-07)
    Ionosonde data of Kodaikanal (Geog.Long. 77° 29′E, dip 3.0°N) and Huancayo (Geog.Long. 75°18′W, dip 2.0°N) are used to show the simultaneous occurrence of a transient disturbance in F region height of composite polarity ...
  • Transient response of the solar wind to changes in flow geometry 
    Hasan, S. S; Venkatakrishnan, P (D.Reidel Publishing Co.,, 1982-10)
    An initial stationary flow in a configuration diverging as r-squared is assumed, a state corresponding to the normal solar wind solution. The effect on the flow through a tube whose area A(r, t) diverges faster than ...
  • Transient Solution of Equations of Hydrodynamics in Gas Clouds 
    Peraiah, A (Indian Institute of Astrophysics, 1981)
    We have presented numerical results of transient phenomenon in incompressible fluids. This has been obtained by solving the equations of conservation of momentum, energy and mass in X and Y geometry. We have used the explict ...

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