IIAP Publications: Recent submissions

  • Exploring the optical behaviour of a Type Iax supernova SN 2014dt 
    Singh, M; Misra, K; Sahu, D. K; Dastidar, R; Gangopadhyay, A; Bose, S; Srivastav, S; Anupama, G. C; Chakradhari, N. K; Brajesh Kumar; Kumar, B; Pandey, S. B (Oxford University Press on behalf of the Royal Astronomical Society, 2018-02)
    We present optical photometric (up to ∼ 410 d since B max ) and spectroscopic (up to ∼ 157 d since B max ) observations of a Type Iax supernova (SN) 2014dt located in M61. SN 2014dt is one of the brightest and ...
  • Characterization of X-ray flare properties of AB Dor 
    Lalitha, S (International Astronomical Union, 2015-08)
    The strong similarities between the flares observed on the Sun and in low mass stars has raised question regarding dynamo in these stars. Using the Sun as a prototype, one may be able to address this. In this paper, we ...
  • Relationships between fluid vorticity, kinetic helicity, and magnetic field on small-scales (quiet-network) on the sun 
    Sangeetha, C. R; Rajaguru, S. P (IOP Publishing, 2016-06-20)
    We derive horizontal fluid motions on the solar surface over large areas covering the quiet-Sun magnetic network from local correlation tracking of convective granules imaged in continuum intensity and Doppler velocity by ...
  • Ejecta curtain radiative transfer modeling for probing its geometry and dust optical properties 
    Shalima, P; Wada, K; Kimura, H (Elsevier, 2015-10)
    An ejecta curtain is produced as a result of impact cratering of celestial bodies that excavates and ejects their surface and underground material. Since ejecta particles are thought to reflect the interior materials and ...
  • Balloon UV experiments for astronomical and atmospheric observations 
    Sreejith, A. G; Mathew, J; Mayuresh, Sarpotdar; Nirmal, K; Ambily, S; Prakash, A; Safonova, M; Murthy, J (SPIE-The International Society for Optical Engineering, 2016-08)
    The ultraviolet (UV) window has been largely unexplored through balloons for astronomy. We discuss here the development of a compact near-UV spectrograph with fiber optics input for balloon flights. It is a modified ...
  • Topological and statistical properties of nonlinear force-free fields 
    Mangalam, A; Prasad, A (Elsevier B.V, 2018-01)
    We use our semi-analytic solution of the nonlinear force-free field equation to construct three-dimensional magnetic fields that areapplicable to the solar corona and study their statistical properties for estimating the ...
  • Developing scanning-slit spectrograph for imaging the Sun 
    Pruthvi, H; Ramesh, K. B; Dhara, Sajal Kumar; Ravindra, B (SPIE--The International Society for Optical Engineering, 2016-08)
    For moderate resolution spectroscopy of the Sun, an imaging spectrograph is being developed at Indian Institute of Astrophysics. With this instrument images of the region of interest of the Sun can be obtained with low ...
  • Simultaneous near-sun observations of a moving type IV radio burst and the associated white-light coronal mass ejection 
    Hariharan, K; Ramesh, R; Kathiravan, C; Wang, T. J (Springer, 2016-05)
    We present rare contemporaneous low-frequency (< 100 MHz) imaging, spectral, and polarimetric observations of a moving type IV radio burst that had close spatio-temporal association with a white-light coronal mass ejection ...
  • A generic FPGA-based detector readout and real-time image processing board 
    Mayuresh, Sarpotdar; Mathew, J; Safonova, M; Murthy, J (SPIE--The International Society for Optical Engineering, 2016-08)
    For space-based astronomical observations, it is important to have a mechanism to capture the digital output from the standard detector for further on-board analysis and storage. We have developed a generic (application- ...
  • Long-term study of Mkn 421 with the HAGAR array of telescopes 
    Sinha, A; Shukla, A; Saha, L; Acharya, B. S; Anupama, G. C; Bhattacharjee, P; Britto, R. J; Chitnis, V. R; Prabhu, T. P; Singh, B. B; Vishwanath, P. R (EDP Sciences, 2016-07)
    Context. The HAGAR Telescope Array at Hanle, Ladakh has been regularly monitoring the nearby blazar Mkn 421 for the past seven years. Aims. Blazars show flux variability in all timescales across the electromagnetic ...
  • Accuracy measurement for image retrieval system 
    Thabasu Kannan, S; Kumaravel, P (Vandana Publications, 2015-08)
    During the past decades we have been observing a permanent increase in image data, leading to huge repositories. Content-based image retrieval (CBIR) methods have tried to improve the access to image data. To date, numerous ...
  • Small scale clustering of late forming dark matter 
    Agarwal, S; Corasaniti, P.-S; Das, Subinoy; Rasera, Y (The American Physical Society, 2015-09-15)
    We perform a study of the nonlinear clustering of matter in the late-forming dark matter (LFDM) scenario in which dark matter results from the transition of a nonminimally coupled scalar field from radiation to collisionless ...
  • Unravelling the Components of a Multi-Thermal Coronal Loop Using Magnetohydrodynamic Seismology 
    Prasad, S. K; Jess, D. B; Klimchuk, J. A; Banerjee, D (IOP Publishing, 2017-01-10)
    Coronal loops, constituting the basic building blocks of the active Sun, serve as primary targets to help understand the mechanisms responsible for maintaining multi-million Kelvin temperatures in the solar and stellar ...
  • Role of primordial black holes in the direct collapse scenario of supermassive black hole formation at high redshifts 
    Pandey, Kanhaiya L; Mangalam, A (Indian Academy of Sciences, 2018-02)
    In this paper, we explore the possibility of accreting primordial black holes as the source of heating for the collapsing gas in the context of the direct collapse black hole scenario for the formation of super-massive black ...
  • Solar Active Longitudes from Kodaikanal White-Light Digitized Data 
    Mandal, Sudip; Chatterjee, Subhamoy; Banerjee, D (IOP Publishing, 2017-01-20)
    The study of solar active longitudes has generated great interest in recent years. In this work we have used a unique, continuous sunspot data series obtained from the Kodaikanal observatory and revisited the problem. An ...
  • CCD time-series photometry of variable stars in globular clusters and the metallicity dependence of the horizontal branch luminosity 
    Arellano Ferro, A; Bramich, D. M; Giridhar, S (Institute de Astronomia, 2017-04)
    We describe and summarize the findings from our CCD time-seri es photom- etry of globular clusters (GCs) program and the use of differe nce image analysis (DIA) in the extraction of precise light curves down to V ≈ 19 ...
  • The role of radiation pressure in the narrow line regions of Seyfert host galaxies 
    Davies, R. L; Dopita, M. A; Kewley, L; Groves, B; Sutherland, R; Hampton, E. J; Shastri, P; Kharb, P; Bhatt, H. C; Scharwachter, J; Jin, C; Banfield, J; Zaw, I; James, B; Juneau, S; Srivastava, S (IOP Publishing, 2016-06-10)
    We investigate the relative significance of radiation pressure and gas pressure in the extended narrow line regions (ENLRs) of four Seyfert galaxies from the integral field Siding Spring Southern Seyfert Spectroscopic ...
  • A theoretical study of the Build-Up of the Sun's Polar Magnetic Field by using a 3D Kinematic Dynamo Model 
    Hazra, G; Choudhuri, A. R; Miesch, Mark S (IOP Publishing, 2017-01-20)
    We develop a three-dimensional kinematic self-sustaining model of the solar dynamo in which the poloidal field generation is from tilted bipolar sunspot pairs placed on the solar surface above regions of strong toroidal ...
  • The violent hard X-ray variability of MRK 421 observed by Nustar in 2013 April 
    Paliya, Vaidehi S; Bottcher, M; Diltz, C; Stalin, C. S; Sahayanathan, S; Ravikumar, C. D (IOP Publishing, 2015-10-01)
    The well-studied blazar Markarian 421 (Mrk 421, z = 0.031) was the subject of an intensive multi-wavelength campaign when it flared in 2013 April. The recorded X-ray and very high-energy (E > 100 GeV) γ-ray fluxes are the ...
  • Expected performances of a Laue lens made with bent crystals 
    Virgilli, Enrico; Valsan, V; Frontera, Filippo; Caroli, Ezio; Liccardo, Vincenzo; Stephen, John Buchan (SPIE-The International Society for Optical Engineering, 2017-10)
    In the context of the Laue project devoted to build a Laue lens prototype for focusing celestial hard x-/soft gamma-rays, a Laue lens made of bent crystal tiles, with 20-m focal length, is simulated. The focusing energy ...

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