IIAP Publications: Recent submissions

  • Detection of IMBHs from microlensing in globular clusters 
    Safonova, M; Rahvar, S (Cambridge University Press, 2007-04)
    Globular clusters have been long predicted to host intermediate-mass black holes (IMBHs) in their centres. The growing evidence that some/all Galactic globular clusters (GCs) could harbour middle range (102 – 104Mxs2299) ...
  • North-south asymmetry in solar activity: predicting the amplitude of the next solar cycle 
    Javaraiah, J (Wiley-Blackwell, 2007-05)
    Using Greenwich and Solar Optical Observing Network sunspot group data obtained during the period 1874-2005, we find that the sums of the areas of the sunspot groups in the 0°-10° latitude-interval of the Sun's northern ...
  • Studies of waves in sunspots using spectropolarimetric observations 
    MacDonald, G. A; Rajaguru, S. P (Cambridge University Press, 2011-08)
    We observe the acoustic velocity oscillations in and near active region NOAA 10960 on 8 June, 2007 using observations from the IBIS instrument at the Dunn Solar Telescope at NSO/Sacramento Peak and simultaneous Hinode ...
  • Supergranulation and its Activity Dependence 
    Paniveni, U; Krishan, V; Singh, J; Srikanth, R (Cambridge University Press, 2011-08)
    We study the complexity of supergranular cells using the intensity patterns obtained at the Kodaikanal solar observatory during the solar maximum. Our data consists of visually identified supergranular cells, from which a ...
  • Dynamic responses of sunspots to their ambient magnetic configuration 
    Bagare, S. P (Cambridge University Press, 2011-08)
    In our earlier study of a revisit of the classic Wilson Effect, it was found that a large proportion of sunspots do not display the geometric effect which is ascribed to a depression of the umbra. It was shown that the ...
  • Magnetohydrostatic equilibrium in starspots: dependences on color (Teff) and surface gravity (g) 
    Rajaguru, S. P; Hasan, S. S (Cambridge University Press, 2011-08)
    Temperature contrasts and magnetic field strengths of sunspot umbrae broadly follow the thermal-magnetic relationship obtained from magnetohydrostatic equilibrium. Using a compilation of recent observations, especially in ...
  • Seyfert Galaxies: Radio Continuum Emission Properties and the Unification Scheme 
    Singh, V; Shastri, P; Athreya, R (Indian Academy of Sciences, 2011-12)
    Seyfert galaxies are classified mainly into type 1 and type 2 depending on the presence and absence of broad permitted emission lines in their optical spectra, respectively. Unification scheme hypothesizes that the ...
  • Some unique constants associated with extremal black holes 
    Sivaram, C; Arun, K (Springer, 2012-03)
    In recent papers we had developed a unified picture of black hole entropy and curvature which was shown to lead to Hawking radiation. It was shown that for any black hole mass, holography implies a phase space of just one ...
  • Solar physics in India: developments from the nineteenth century to the present era 
    Hasan, S. S; Choudhuri, A. R; Rajaguru, S. P (Astronomical Society of India, 2011)
    Modern solar astronomy took root in India with the discovery of helium during the total solar eclipse of 1868 and followed by the setting up of the Kodaikanal Observatory in 1899. We provide a brief overview of the growth ...
  • Sunspot seismology: accounting for magnetohydrodynamic wave processes using imaging spectropolarimetry 
    Rajaguru, S. P (Astronomical Society of India, 2011)
    E ects of acoustic wave absorption, mode conversion and transmission by a sunspot on the helioseismic inferences are widely discussed, yet accounting for them has proved di cult for lack of a consistent framework within ...
  • Low frequency solar radio astronomy at the Indian Institute of Astrophysics (IIA) 
    Ramesh, R (Astronomical Society of India, 2011)
    IIA is presently involved in the expansion of its existing radioheliograph operating in the frequency 120-40 MHz at the Gauribidanur radio observatory located about 80 km north of Bangalore. Once completed, the expanded ...
  • A dual Fabry-Perot based narrow band imager for the National Large Solar Telescope 
    Ravindra, B; Banyal, R. K (Astronomical Society of India, 2011)
    A large solar telescope is usually equipped with several postfocus instruments deployed to study the dynamics of the solar features at di erent wavelengths. Indian Institute of Astrophysics (IIA) has proposed to build ...
  • National Large Solar Telescope of India 
    Hasan, S. S (Astronomical Society of India, 2011)
    The National Large Solar Telescope NLST will be a state-ofthe- art 2-m class telescope for carrying out high-resolution studies of the solar atmosphere. Sites in the Himalayan region at altitudes greater than 4000-m ...
  • Optical observational programs at the Indian Institute of Astrophysics 
    Singh, J; Ravindra, B (Astronomical Society of India, 2011)
    The Indian Institute of Astrophysics has been making optical observations of the sun for more than a century by taking images of the sun in continuum to study the photosphere, Ca-K line and H-alpha line in order to study ...
  • Studies of a possible new Herbig Ae/Be star in the open cluster NGC 7380 
    Mathew, B; Banerjee, D. P. K; Ashok, N. M; Subramaniam, A; Bhavya, B; Joshi, V (Chinese Academy of Sciences, 2012-02)
    We present a study of the star 2MASS J22472238+5801214 with the aim of identifying its true nature which has hitherto been uncertain. This object, which is a member of the young cluster NGC 7380, has been variously proposed ...
  • Formation and Observations of Shadow Bands During the Total Solar Eclipse of November 23, 2003 Near Maitri, Antarctic 
    Vats, Hari Om; Bagare, S. P; Bhandari, S. M (World Scientific Publishing Co., 2006)
    The phenomenon of shadow bands takes place due to the scattering of sunlight by the irregularities in the local atmosphere. Observation of shadow bands were made just before and after the total solar eclipse (TSE) on ...
  • Thermal Gravitational Waves from Primordial Black Holes 
    Sivaram, C; Arun, K (Bentham Open, 2011-08)
    Thermal gravitational waves can be generated in various sources such as, in the cores of stars, white dwarfs and neutron stars due to the fermion collisions in the dense degenerate Fermi gas [1-3]. Such high frequency ...
  • Thermal Gravitational Waves 
    Sivaram, C; Arun, K (Bentham Open, 2011-08)
    There is a lot of current interest in sources of gravitational waves and active ongoing projects to detect such radiation, such as the LIGO project. These are long wavelength, low frequency gravitational waves. LISA would ...
  • New Class of Dark Matter Objects and their Detection 
    Sivaram, C; Arun, K (Bentham Open, 2011-05)
    About one-fourth of the universe is thought to consist of dark matter. Yet there is no clear understanding about the nature of these particles. Commonly discussed dark matter candidates includes the so called WIMPs or ...
  • Weak G-band stars on the H-R diagram: clues to the origin of the Li anomaly 
    Palacios, A; Parthasarathy, M; Bharat Kumar, Y; Jasniewicz, G (EDP Sciences, 2012-02)
    Aims. Weak G-band (WGB) stars are a rare class of cool luminous stars that present a strong depletion in carbon, but also lithium abundance anomalies that have been little explored in the literature since the first discovery ...

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