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Browsing IIAP Publications by Title

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  • The extended H i disk and star formation in the dwarf spiral galaxy NGC 4701 
    Mousumi Das; Sengupta, C; Honey, M (IOP Publishing, 2019-02-01)
    We present H i, optical, and near-infrared observations of the nearby bulgeless, dwarf spiral galaxy NGC 4701. The galaxy lies on the Virgo filament and is one of the most gas-rich dwarfs in our local environment. Our aim ...
  • An extended mathched filter approach for the detection of hidden periodicities smeared by roughness 
    Vani, V. C; Chatterjee, S (Indian Academy of Science, 2004-01-10)
  • The extended solar cycle: muddying the waters of solar/stellar dynamo modeling or providing crucial observational constraints? 
    Srivastava, Abhishek K; McIntosh, Scott W; Arge, N; Banerjee, D; Dikpati, Mausumi; Dwivedi, Bhola N; Guhathakurta, Madhulika; Karak, B. B; Leamon, Robert J; Matthew, Shibu K; Munoz-Jaramillo, Andres; Nandy, D; Norton, Aimee; Upton, L; Chatterjee, S; Rakesh, M; Yamini K. Rao; Rahul Yadav (Frontiers, 2018-11-22)
    "In 1844 Schwabe discovered that the number of sunspots increased and decreased over a period of about 11 years, that variation became known as the sunspot cycle. Almost eighty years later, Hale described the nature of the ...
  • Extended use of two crossed Babinet compensators for wavefront sensing in adaptive optics 
    Lancelot, J. P; Saxena, A. K (SPIE, 2010-12)
    An extended use of two crossed Babinet compensators as a wavefront sensor for adaptive optics applications is proposed. This method is based on the lateral shearing interferometry technique in two directions. A single ...
  • Extending the sunspot area series from Kodaikanal Solar Observatory 
    Jha, Bibhuti K; Hegde, M; Priyadarshi, Aditya; Mandal, Sudip; Ravindra, B; Banerjee, D (Frontiers, 2022-10)
    Kodaikanal Solar Observatory (KoSO) possesses one of world's longest and homogeneous records of sunspot observations that span more than a century (1904–2017). Interestingly, these observations (originally recorded in ...
  • The extent of 3-min oscillations in regions other than sunspot plumes 
    Lin, C. -H; Banerjee, D; Doyle, J. G; O`Shea, E (EDP Science, 2005-12)
    The active region, AR0554, was observed with NIS/CDS on board SoHO to examine the extent and range of oscillations from a range of features. Among all the NIS spectral lines analysed, significant oscillations were found ...
  • Extragalactic star formation rate -- estimates at different wavelengths 
    Prabhu, T. P (Astronomical Society of India, 2012)
    The star formation rate (SFR) in galaxies is of prime importance in the study of formation and evolution of galaxies. Different methods have hence been evolved to estimate the current SFR in galaxies, using indicators at ...
  • Extragalactic survey of UV Galaxies using GALEX 
    Bose, L. S; Narayanankutty, K; Sujatha, N. V; Murthy, J (International Organization Of Scientific Research (IOSR), 2014-05)
    We report here the results of the study of extragalactic radiation using number counts of galaxies at high galactic latitudes. For this study nine GALEX DIS targets around ELAISN1 in the North Pole. The overlapped regions ...
  • Extragalactic survey using GALEX–spitzer matching fields 
    Bose, L. S; Sujatha, N. V; Narayanankutty, K; Murthy, J (Pleiades Publishing, 2015-12)
    We have used Spitzer observations of galaxies in the ELAIS-N1 region centered at 16h10m01s, +54◦30′36″ to extend the effective sensitivity of GALEX UV observations of the same region. Spitzer is more sensitive to external ...
  • Extrapolating SMBH correlations down the mass scale: the case for IMBHs in globular clusters 
    Safonova, M; Shastri, P (Springer, 2010-01)
    Empirical evidence for both stellar mass black holes (M (aEuro cent)< 10(2) M (aS (TM))) and supermassive black holes (SMBHs, M (aEuro cent)> 10(5) M (aS (TM))) is well established. Moreover, every galaxy with a bulge ...
  • Extrapolating Zernike Moments to Predict Future Optical Wave-fronts in Adaptive Optics Using Real Time Data Mining 
    Vyas, A; Roopashree, M. B; Prasad, B. R (David Publishing Company, 2011-03)
    We present the details of predicting atmospheric turbulence by mining Zernike moment data obtained from simulations as well as experiments. Temporally correlated optical wave-fronts were simulated such that they followed ...
  • The extraterrestrial Raman-scattering 
    Krishan, V (Indian Academy of Sciences, 1993-03-10)
    The diagnostic potential of the Raman scattering of the electro-magnetic radiation has been realized in an all embracing manner in terrestrial phenomena. Our knowledge of the remote reaches of the universe comes almost ...
  • Extremal charged black holes, dark matter and dark energy 
    Sivaram, C; Arun, K; Prasad, A (Springer, 2018-10)
    Formation of black holes may be constrained by intrinsic parameters characterizing them such as electric charge. Here we discuss the effects of a relatively minute excess of charge on extremal black hole formation and the ...
  • The Extreme Solar Activity during October–November 2003 
    Hiremath, K. M; Lovely, M. R; Kariyappa, R (Indian Academy of Sciences, 2006-09)
    The positional measurements of sunspots from the Kodaikanal Observatory and Solar Geophysical data are used to study the association between occurrence of the abnormal activities of big sunspot groups that were observed ...
  • The extreme ultraviolet deficit: jet connection in the quasar 1442+101 
    Punsly, B; Marziani, P; Kharb, P; O'Dea, C. P; Vestergaard, M (IOP Publishing, 2015-10-10)
    In previous studies, it has been shown that the long-term time-averaged jet power, Q, is correlated with spectral index in the extreme ultraviolet (EUV), αEUV (defined by n ~ n-a F EUV computed between 700 and 1100 Å ). ...
  • Extreme-energy cosmic rays: hints to new physics beyond the standard model? 
    Bhattacharjee, P; Sigl, G (Springer, 2001)
    The observed extreme energy cosmic ray (EECR) events above 10(20) eV are difficult to explain within tile standard scenario of origin of cosmic rays in which charged particles are accelerated in magnetized shocks in powerful ...
  • f Gravity and gravitational singularities 
    Sivaram, C; Sinha, K. P; Lord, E. A (Nature Publishing Group, 1974-06)
    TRAUTMAN has postulated1 that the usual space-time singularity occurring in classical cosmological models and in the gravitational collapse of massive objects could be averted if intrinsic spin effects are incorporated ...
  • f-gravity and Dirac's large numbers hypothesis 
    Sivaram, C; Sinha, K. P (Elsevier, 1976-01)
    The identification of the strong f-gravity metric with Dirac's atomic metric and the large value of its coupling constant, i.e. Gf 10/sup39 GN (GN being Newtonian constant) provides the physical basis for the large numbers ...
  • F-region changes associated with the solar flare of 23 February 1956 
    Bhargava, B. N; Subrahmanyan, R. V (Elsevier Ltd., 1962-04)
  • F-region oscillations observed during October 24, 1995 solar eclipse at Waltair 
    Rao, B. M; Anhjaneyulu, P (Indian Institute of Astrophysics, Bangalore, 1997)
    Measurements of changes in phase path/Doppler of HF signals on 5.5 MHz from F-region of the ionosphere are carried-out using coherent pulsed Doppler radar. Preliminary analysis of the data show large deviations in phase ...

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