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Browsing IIAP Publications by Title

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  • S7 : Probing the physics of seyfert galaxies through their ENLR & HII regions 
    Dopita, M. A; Shastri, P; Scharwachter, J; Kewley, L. J; Davies, R; Sutherland, R; Kharb, P; Jose, Jessy; Bhatt, H. C; Ramya, S; Hamptona, E; Jina, C; Banfielda, J; Zawa, I; Srivastavaa, Shweta; Jamesa, B (Cambridge University Press, 2015-02)
    Here we present the first results from the Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7) which aims to investigate the physics of ∼140 radio-detected southern active Galaxies with z<0.02 through Integral ...
  • SALT revisits DY Cen: a rapidly evolving strontium-rich single helium star 
    Jeffery, C. S; Kameswara Rao, N; Lambert, D. L (Oxford University Press on behalf of the Royal Astronomical Society, 2020-04)
    The hydrogen-deficient star DY Cen has been reported as an R CrB-type variable, an extreme helium star (with some hydrogen), and as a single-lined spectroscopic binary. It has been associated with a dramatic change in ...
  • A SALT spectral study of S0s hosting pseudobulges 
    Vaghmare, K; Barway, Sudhanshu; Vaisanen, Petri; Ramphul, Rajin; Wadadekar, Yogesh; Kembhavi, Ajit K (Oxford University Press on behalf of the Royal Astronomical Society, 2018-11)
    We present a SALT-RSS spectroscopic study of a sample of S0 galaxies established by Vaghmare et al. (2015) as having pseudobulges using a combination of photometric criteria. We extract the spectra of various regions along ...
  • SAO 244567 - A post-AGB star which has turned into a planetary nebula within the last 40 years 
    Parthasarathy, M; Garcia-Lario, P; Pottasch, S. R; Manchando, A; Clavel, J; de Martino, D; Van de Steene, G. C. M; Sahu, K. C (European Sothern Observatory, 1993-01)
    SAO 244567 (Hen 1357 = CPD -59 deg 6926 = IRAS 17119-5926) is an IRAS source with far infrared colors and flux distribution similar to those of planetary nebulae. The IUE ultraviolet spectra obtained in July 1988 and April ...
  • SAO 75669: A late type giant behind the molecular cloud MBM 12 
    Bhatt, H. C; Sagar, R; Subramaniam, A; Gorti, U; Chandrasekhar, T; Ashok, N. M; Ragland, S (European Southern Observatory, 1994-09)
    Photometric and spectroscopic observations of the star SAO 75669 in the region of the high galactic latitude molecular cloud MBM 12 are presented. The optical, near-infrared and far-infrared IRAS photometric magnitudes ...
  • Saturn-like ring system around Uranus 
    Bhattacharyya, J. C; Bappu, M. K. V (Nature Publishing Group, 1977-12)
    A photoelectric record of the occultation of SAO 158687 by Uranus on March 10, 1977, is analyzed. The observed variation in the intensity of the star's light is shown to indicate the presence of four zones, which are ...
  • Scalable platform for adaptive optics real-time control, part 1: concept, architecture, and validation 
    Surendran, Avinash; Burse, Mahesh P.; Ramaprakash, A. N; Paul, Jyotirmay; Das, Hillol K.; Parihar, P. S (SPIE-Society of Photo-Optical Instrumentation Engineers, 2018-07)
    We demonstrate an architecture for adaptive optics (AO) control based on field programmable gate arrays (FPGAs), making active use of their configurable parallel processing capability. The unique capabilities of scalable ...
  • Scalable platform for adaptive optics real-time control, part 2: field programmable gate array implementation and performance 
    Surendran, Avinash; Burse, Mahesh P.; Ramaprakash, A. N; Parihar, P. S (SPIE-Society of Photo-Optical Instrumentation Engineers, 2018-07)
    The next generation of adaptive optics (AO) systems on large telescopes will require immense computation performance and memory bandwidth, both of which are challenging with the technology available today. The objective ...
  • Scale transformations and evolution of the early universe 
    Sivaram, C (Springer, 1993-09)
    The notion of discrete scale transformations is invoked to suggest strong links between fundamental interactions and cosmology giving rise to a hierarchy of cosmic scales.
  • SCALES on Keck: optical design 
    Kupke, Renate; Stelter, R. Deno; Hasan, Amirul; Surya, Arun; Kain, Isabel; Briesemeister, Zackery; Li, Jialin; Hinz, Phil; Skemer, Andrew; Gerard, Benjamin; Dillon, Daren; Ratliff, Christopher (SPIE-The International Society for Optical Engineering, 2022-08)
    SCALES is a high-contrast, infrared coronagraphic imager and integral field spectrograph (IFS) to be deployed behind the W.M. Keck Observatory adaptive optics system. A reflective optical design allows diffraction-limited ...
  • SCALES Status Report 
    Stelter, R. Deno; Skemer, Andrew J.; Sallum, Stephanie; MacDonald, Nicholas; Kupke, Renate; Ratlif, Christopher; Bourgenot, Cyril; Cabak, Gerald; Gonzales, Michael; Rodriguez, Cristian A.; Hunter, Aaron; Banyal, R. K; Sivarani, T; Fitzgerald, Michael P.; Kassis, Marc; Absil, Olivier; Alvarez, Carlos; Batalha, Natasha; Boucher, Marc-Andre; Brandt, Timothy; Briesemeister, Zack; Kleer, Katherine de; Pater, Imke de; Deich, William; Divakar, Devika; Gauvin, Etienne; Greene, Thomas; Hasan, Amirul; Hinz, Philip; Jensen-Clem, Rebecca; Johnson, Christopher; Govinda, K. V; Kain, Isabel; Lach, Mackenzie; Landry, Jean-Thomas; Liu, Michael C.; Lyke, James; Magnone, Kenneth; Marin, Eduardo; Martinez, Raquel A.; Mawet, Dimitri; McGurk, Rosalie; Miles, Brittany; Prakash, A; Sandford, Dale; Ramya, S; Sheehan, Patrick; Sohn, Ji Man; Stone, Jordan; Surya, Arun; Varshney, Hari Mohan; Wang, Eric (SPIE - Society of Photo-Optical Instrumentation Engineers, 2024-07)
    SCALES (Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy) is the next-generation, diffraction-limited, thermal infrared, fully cryogenic, coronagraphic exoplanet spectrograph and imager for W.M. Keck ...
  • Scatter due to Ultraviolet (UV) photopolymerization of molecular contamination on optical surfaces 
    Venkata Suresh, Narra; Prasad, B. R; Somasundaram, P. K; Kathiravan, S; Venkatasubramanian, N; Padavu, U. K; Mani, V. T; Basavaraja, S; Naik, Rajesh (Springer Nature B.V., 2020-12)
    Molecular contamination on optical surfaces is a serious issue for space payloads. For ultraviolet (UV) payloads, molecular contamination results in loss of throughput. Whereas, for visible (VIS) payloads loss of throughput ...
  • Scatter due to Ultraviolet (UV) photopolymerization of molecular contamination on optical surfaces 
    Venkata Suresh, Narra; Prasad, B. R; Somasundaram, P. K; Sriraman, K; Venkatasubramanian, N; Padavu, U. K; Mani, V. T; Basavaraja, S; Naik, R (Springer, 2020-12)
    Molecular contamination on optical surfaces is a serious issue for space payloads. For ultraviolet (UV) payloads, molecular contamination results in loss of throughput. Whereas, for visible (VIS) payloads loss of throughput ...
  • Scatter studies for visible emission line coronagraph on board ADITYA-L1 mission 
    Venkata Suresh, Narra; Prasad, B. R; Raj Kumar, Nalla; Singh, J (SPIE-The International Society for Optical Engineering, 2017-01)
    Visible emission line coronagraph (VELC) on board ADITYA-L1 mission is an internally occulted mirror coronagraph designed for solar coronal observations over a field of view (FOV) of 1.05 Ro to 3 Ro. To achieve the proposed ...
  • Scattering by black holes: a simulated potential approach 
    Aguirregabiria, J. M; Vishveshwara, C. V (Elsevier B.V, 1996-01)
    The effective potential appearing in the scattering of scalar, electromagnetic and gravitational waves by a Schwarzschild black hole is replaced with potentials for which the exact analytical solutions are known. It is ...
  • Scattering of light by a periodic structure in the presence of randomness IV. Limit of detection by curve fitting 
    Chatterjee, S; Vani, V. C (Indian Academy of Sciences, 2005-09)
    In the context of scattering of light, we determine the extent of randomness within which a hidden periodic part can still be detected. The detection is carried out using a technique called the extended matched filtering, ...
  • Scattering of light by a periodic structure in the presence of randomness VII: Application of statistical detection test 
    Vani, V. C; Chatterjee, S (Indian Academy of Sciences, 2008-05)
    Detection of periodic structures, hidden in random surfaces has been addressed by us for some time and the `extended matched filter' method, developed by us, has been shown to be effective in detecting the ...
  • Scattering of Light by a Periodic Structure in the Presence of Randomness. III. Limit of the Extended Matched Filtering Method for the Detection of Weak Periodicities 
    Vani, V. C; Chatterjee, S (Optical Society of America, 2004-06-20)
    It is known that, for scattering of light by a rough grating, the periodically occurring intensity maxima that are characteristic of the periodic part of the scattering medium get smeared off and hence become undetectable ...
  • Scattering of light by a periodic structure in the presence of randomness. V. Detection of successive peaks in a periodic structure 
    Vani, V. C; Chatterjee, S (Optical Society of America, 2006-12)
    We address the problem of detecting periodic structures hidden behind roughness. We have shown that if r0 is the coherence length of the scattered radiation, due to the random part of the surface, and Lambda is the wavelength ...
  • Scattering of light by rough surfaces: high and low roughness approximations 
    Chatterjee, S; Banyal, R. K (Department of Applied Optics and photonics, University of Calcutta, 2009)
    Scattering of light by rough surface is considered in the Kirchoff approximation. Analytical expressions are presented for the scattered intensity by considering the elevations in the z-direction. «(x, y) at any point (x,y) ...

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