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Browsing IIAP Publications by Title

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  • A multiwavelength study of the Stingray Nebula; properties of the nebula, central star, and dust 
    Otsuka, M; Parthasarathy, M; Tajitsu, A; Hubrig, S (IOP Publishing, 2016-07)
    We performed a detail chemical abundance analysis and photo-ionization modeling of the Stingray Nebula (Hen3-1357, Parthasarathy et al. 1993[1]) to more characterize this PN. We calculated nine elemental abundances using ...
  • Multiwavelength study of the TeV blazar Mrk 421 during a giant flare 
    Shukla, A; Chitnis, V. R; Vishwanath, P. R; Acharya, B. S; Anupama, G. C; Bhattacharjee, P; Britto, R. J; Prabhu, T. P; Saha, L; Singh, B. B (EDP Sciences, 2012-05)
    Aims. The nearby (z = 0.031) TeV blazar Mrk 421 was reported to be in a high state of flux activity since November, 2009. We aim to investigate possible changes in the physical parameters of Mrk 421 during its high state ...
  • A multiwavelength study of three hybrid blazars 
    Stanley, E. C; Kharb, P; Lister, M. L; Marshall, H. L; O'Dea, C; Baum, S (IOP Publishing, 2015-07-01)
    We present multiwavelength imaging observations of PKS 1045−188, 8C 1849+670, and PKS 2216−038, three radio-loud active galactic nuclei from the MOJAVE-Chandra Sample that straddle the Fanaroff-Riley (FR) boundary between ...
  • A multiwavelength view of the open cluster NGC 2527: discovery of active stars 
    Shah, N; Singh, K. P; Subramaniam, A (Oxford University Press on behalf of the Royal Astronomical Society, 2020-04)
    Star clusters are ideal platforms for categorizing X-ray emitting stars and to study X-ray emission as a function of stellar age and activity. We present a comprehensive study of an open star cluster, NGC 2527, by combining ...
  • MUSSES2020J: The Earliest Discovery of a Fast Blue Ultraluminous Transient at Redshift 1.063 
    Jiang, Ji-an; Yasuda, Naoki; Maeda, Keiichi; Tominaga, Nozomu; Doi, Mamoru; Ivezic, Zeljko; Yoachim, Peter; Uno, Kohki; Moriya, Takashi J; Kumar, Brajesh; Pan, Yen-Chen; Tanaka, Masayuki; Tanaka, Masaomi; Nomoto, Kenichi; Jha, Saurabh W; Ruiz-Lapuente, Pilar; Jones, David; Shigeyama, Toshikazu; Suzuki, Nao; Kokubo, Mitsuru; Furusawa, Hisanori; Miyazaki, Satoshi; Connolly, Andrew J; Sahu, D. K; Anupama, G. C (IOP Publishing, 2022-07-10)
    In this Letter, we report the discovery of an ultraluminous fast-evolving transient in rest-frame UV wavelengths, MUSSES2020J, soon after its occurrence by using the Hyper Suprime-Cam (HSC) mounted on the 8.2 m Subaru ...
  • Mutual phenomena of Jovian satellites 
    Vasundhara, R (Indian Academy of Sciences, 1991-03)
    Mutual eclipses of Galilean satellites were observed and the results are given. The observations are fitted by utilizing Lambert's law, theoretical models assuming a uniform disk, and Lommel-Seeliger's law which describes ...
  • Mutual phenomena of the Galilean satellites: an analysis of the 1991 observations from VBO 
    Vasundhara, R (European Southern Observatory, 1994-01)
    Results of analysis of seventeen mutual events, of the Galilean satellites, observed at the Vainu Bappu Observatory (VBO) during the 1991 are presented. The light curves were fitted with theoretical models to derive the ...
  • Myopic aberrations: Simulation based comparison of curvature and Hartmann Shack wavefront sensors 
    Roopashree, M. B; Vyas, A; Weddell, S. J; Prasad, B. R (Elsevier B.V., 2014-02-01)
    In comparison with a Hartmann Shack wavefront sensor, the curvature wavefront sensor is known for its higher sensitivity and greater dynamic range. The aim of this study is to numerically investigate the merits of using a ...
  • The mysterious bar of the large magellanic cloud: what is it? 
    Subramaniam, A; Subramanian, S (Institute of Physics, 2009-09)
    The bar of the Large Magellanic Cloud (LMC) is one of the prominent, but controversial, features regarding its location with respect to the disk of the LMC. In order to study the relative location of the bar with respect ...
  • The mystery of the cosmic diffuse ultraviolet background radiation 
    Henry, R. C; Murthy, J; Overduin, James; Tyler, Joshua (IOP Publishing Ltd, 2015-01-01)
    The diffuse cosmic background radiation in the Galaxy Evolution Explorer far-ultraviolet (FUV, 1300-1700 Å) is deduced to originate only partially in the dust-scattered radiation of FUV-emitting stars: the source of a ...
  • Myths, Superstitions and Propaganda in Scientific Age 
    Banyal, R. K (2012-01)
    From prehistoric times, humans have evolved as pattern seeking and storytelling species. While the capacity to find patterns and infer meanings had obvious advantages for survival, the brain is not always successful in ...
  • M∙ − σ relation in spherical systems 
    Bhattacharyya, D; Mangalam, A (Indian Academy of Sciences, 2018-02)
    To investigate the M∙−σ relation, we consider realistic elliptical galaxy profiles that are taken to follow a single power-law density profile given by Ï (r)=Ï 0(r/r0)−γ or the Nuker intensity profile. We calculate ...
  • N-Body Simulation of a Deeply Penetrating Collision Between Unequal Galaxies 
    Namboodiri, P. M. S; Sastry, K. S; Narasimhan, K. S. V. S (Kluwer Academic Publishers, 1998-09)
    We study the tidal effects of a deeply penetrating collision between two spherical galaxies, one twice massive but less dense than the other, by numerical simulations. We consider the relative motion of the galaxies to be ...
  • Nano-constraints on the spatial anisotropy of the gravitational constant 
    Unnikrishnan, C. S; Gillies, G. T (Elsevier, 1994-11)
    We present constraints from various experimental data that limit any spatial anisotropy of the gravitational constant to less than a part per 109 or even smaller. This rules out with a wide margin the recently reported ...
  • Narrow Band Photometry in Emission Lines during the Total Solar Eclipse of October 24, 1995 
    Singh, J; Cowsik, R; Venkatakrishnan, P; Srinivasan, R; Chinnappan, V; Raju, K. P; Srikanth, R (Indian Institute of Astrophysics, Bangalore, 1997)
    To investigate the spatial variation of tempereture and density within coronal strucures, narrow band photometry in three coronal emission lines was done during this eclipse. The emission lines 6374 (FeX), 7892 (Fe XI) and ...
  • Narrow Band Photometry of Rho Puppis 
    Doss, A. T (Kodaikanal Observatory, 1969-07)
    Monochromatic flux values of the dwarf Cepheid Rho Puppis have been evaluated over the cycle from observations made in the 1967 season through four narrow band filters centred at 3858 A/sup0/ 4310 A/supo/, 4720 A/supo/ and ...
  • Narrow band photometry of selected asteroids 
    Rajamohan, R; Bhargavi, S. G (Lunar and Planetary Inst, 1992-12)
    The CCD photometry of selected asteroids was carried out to check for possible cometary activity in them. To distinguish the asteroids with possible cometary activity from those of the main belt, each object of interest ...
  • Narrow-line Seyfert 1 galaxies in Sloan Digital Sky Survey: a new optical spectroscopic catalogue 
    Paliya, Vaidehi S; Stalin, C. S; Dominguez, Alberto; Saikia, D. J (Oxford University Press on behalf of Royal Astronomical Society, 2024-01)
    Narrow-line Seyfert 1 (NLSy1) galaxies are an enigmatic class of active galactic nuclei (AGN) that exhibit peculiar multiwavelength properties across the electromagnetic spectrum. For example, these sources have allowed ...
  • 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 ...
  • National Workshop on Preserving our Scientific Heritage, held at Indian Institute of Astrophysics, Bangalore, January 21 – 22, 2008 – a report 
    Birdie, C; Vagiswari, A; Indira Chowdhury (Indian Natioanl Science Academy, 2008-09)

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