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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Intranight optical monitoring of optically selected bright quasars 
    Sagar, R; Gopal-Krishna; Wiita, P. J (Royal Astronomical Society, 1996-08)
    As part of an ongoing programme to search for intranight optical variations, we report results for six radio-quiet and one radio-moderate, but all optically bright and luminous, quasi-stellar objects (QSOs), using the ...
  • Intranight optical variability in optically selected QSOs 
    Gopal-Krishna; Sagar, R; Wiita, J. Paul (Blackwell Publishing, 1995-06)
    We report results from a continuing programme to search for intranight optical variability in one radio-moderate and six radio-quiet (but all optically bright and luminous) quasi-stellar objects, using the 2.34-m Vainu ...
  • Intranight optical variability of blazars and radio-quiet quasars using the ZTF survey 
    Negi, Vibhore; Gopal-Krishna; Joshi, Ravi; Chand, Hum; Wiita, Paul J; Navaneeth, P. K; Singh, Ravi S (Oxford University Press on behalf of Royal Astronomical Society, 2023-07)
    We explore the potential of the ongoing Zwicky Transient Facility (ZTF) survey for studying intranight optical variability (INOV) of active galactic nuclei (AGNs), in particular for picking rare events of large INOV ...
  • Intranight optical variability of γ -ray-loud narrow-line Seyfert 1 galaxies 
    Paliya, Vaidehi S; Stalin, C. S; Kumar, Brijesh; Kumar, Brajesh; Bhatt, V. K; Pandey, S. B; Yadav, K. S (Oxford University Press on behalf of the Royal Astronomical Society, 2013-01-21)
    The Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope has detected γ-ray emission in about half a dozen narrow-line Seyfert 1 (NLSy1) galaxies. This indicates the presence of relativistic jets in these ...
  • The Intriguing Parsec-scale Radio Structure in the “Offset AGN” KISSR 102 
    Kharb, P; Lena, D; Paragi, Z; Subramanian, S; Vaddi, S; Das, M; Khatun, R (IOP Publishing, 2020-02-10)
    We report the detection of an intriguing parsec-scale radio source in the "offset AGN" candidate, KISSR 102. The elliptical host galaxy includes two optical nuclei at a projected separation of 1.54 kpc, N1 and N2, to the ...
  • Intrinsic Electric Dipole Moments of Paramagnetic Atoms: Rubidium and Cesium 
    Nataraj, H. S; Sahoo, B. K; Das, B. P; Mukherjee, D (The American Physical Society., 2008-07)
    The electric dipole moment (EDM) of paramagnetic atoms is sensitive to the intrinsic EDM contribution from that of its constituent electrons and a scalar--pseudo-scalar (S-PS) electron-nucleus interactions. The electron ...
  • The intrinsic reddening of the magellanic clouds as traced by background galaxies – I. The bar and outskirts of the small magellanic cloud 
    Bell, Cameron P. M; Cioni, Maria-Rosa L.; Wright, A. H; Rubele, Stefano; Nidever, David L.; Tatton, Ben L; van Loon, Jacco Th.; Ivanov, Valentin D.; Subramanian, S; Oliveira, Joana M; Grijs, Richard de; Pennock, Clara M.; Choi, Yumi; Olsen, Knut; Niederhofer, Florian; Choudhury, Samyaday; Delgado, David Mart ́ınez; Munoz, Ricardo R. (Oxford University Press on behalf of the Royal Astronomical Society, 2019-12)
    We present a method to map the total intrinsic reddening of a foreground extinguish- ing medium via the analysis of spectral energy distributions (SEDs) of background galaxies. In this pilot study, we implement ...
  • The intrinsic reddening of the Magellanic Clouds as traced by background galaxies – I. The bar and outskirts of the Small Magellanic Cloud 
    Bell, C. P. M.; Cioni, Maria-Rosa L; Wright, A. H; Rubele, Stefano; Nidever, David L; Tatton, Ben L; van Loon, Jacco Th; Ivanov, Valentin D; Subramanian, S; Oliveira, J. M; Grijs, Richard de; Pennock, Clara M; Choi, Yumi; Zaritsky, Dennis; Olsen, Knut; Niederhofer, Florian; Choudhury, S; Martinez-Delgado, David; Munoz, R. R (Oxford University Press on behalf of the Royal Astronomical Society, 2019-11)
    We present a method to map the total intrinsic reddening of a foreground extinguishing medium via the analysis of spectral energy distributions (SEDs) of background galaxies. In this pilot study, we implement this technique ...
  • The Intrinsic reddening of the Magellanic Clouds as traced by background galaxies – II. The Small Magellanic Cloud 
    Bell, C. P. M; Cioni, Maria-Rosa L; Wright, A. H; Rubele, Stefano; Nidever, David L; Tatton, Ben L; van Loon, Jacco Th; Zaritsky, Dennis; Choi, Yumi; Choudhury, Samyaday; Clementini, Gisella; de Grijs, Richard; Ivanov, Valentin D; Majewski, Steven R; Marconi, Marcella; Martinez-Delgado, David; Massana, Pol; Munoz, Ricardo R; Niederhofer, Florian; Noel, Noelia E D; Oliveira, Joana M; Olsen, Knut; Pennock, Clara M; Ripepi, V; Subramanian, S; Katherina Vivas, A (Oxford University Press on behalf of the Royal Astronomical Society, 2020-11)
    We present a map of the total intrinsic reddening across ≃34 deg2 of the Small Magellanic Cloud (SMC) derived using optical (ugriz) and near-infrared (IR; YJKs) spectral energy distributions (SEDs) of background galaxies. ...
  • Intrinsically Polarized Blend Lines 
    Sowmya, K; Nagendra, K. N; Sampoorna, M (Astronomical Society of the Pacific, 2014-10)
    The Second Solar Spectrum formed by coherent scattering processes in the Sun, is highly structured. It is characterized by numerous blend lines, both intrinsically polarizing and depolarizing, superposed on the background ...
  • Introduction to astrobiology 
    Sivaram, C; Sastry, A (Universities Press (India), 2004)
    Astrobiology is the science that seeks to unravel the mysteries of the orign of life and the conditions that would support the birth and evolution of life forms. It involves several disciplines of science which are essential ...
  • An introduction to radiative transfer: methods and applications in astrophysics 
    Peraiah, A (Cambridge University Press, 2002)
    Astrophysicists have developed several very different methodologies for solving the radiative transfer equation. An Introduction to Radiative Transfer applies these techniques to stellar atmospheres, planetary nebulae, ...
  • Introduction to Supernova Phenomena 
    Krishan, V (Indian Institute of Astrophysics, 1988)
  • An introduction to the Indian Astronomical Observatory, Hanle 
    Cowsik, R; Srinivasan, R; Prabhu, T. P (Astronomical Society of India, 2002)
    Situated in the high-altitude cold desert of Changthang Ladakh bordering Himachal Pradesh and Tibet, Indian Astronomical Observatory, Hanle (32o46m46sN, 78o57'51''E; 4500 m above msl), provides excellent opportunities for ...
  • An introduction to waves and oscillations in the Sun 
    Satya Narayanan, A (Springer, 2013)
    Astrophysicists and others studying the Sun will find this expansive coverage of what we know about waves and oscillations in our nearest star an informative introduction to a hot contemporary topic. After a section ...
  • Inverse Cascade in Hydrodynamic Turbulence and its Role in Solar Granulation 
    Krishan, V (International Astronomical Union, 1990)
    Self-organization i.e the formation of large ordered structures in a turbulent medium is a consequence of inverse cascade where energy preferentially transfers towards large spatial scales. It is envisaged that this may ...
  • Inverse Modelling for parameter estimation and experiment design 
    Gaur, V. K (Indian academy of Sciences, 1999-02)
    Inverse modelling forced itself on the attention of scientists in the 1960s with the advent of satellites and other revelatory technologies, despite their putative ill-posedness, when it became clear that estimation of ...
  • Investigating AGN black hole masses and the MBH-σe relation for low surface brightness galaxies 
    Subramanian, S; Ramya, S; Das, M; George, K; Sivarani, T; Prabhu, T. P (Oxford University Press on behalf of the Royal Astronomical Society, 2016-01)
    We present an analysis of the optical nuclear spectra from the active galactic nuclei (AGN) in a sample of low surface brightness (LSB) galaxies. Using data from the Sloan Digital Sky Survey (SDSS), we derived the virial ...
  • Investigating Extra-solar Planetary System Qatar-1 through Transit Observations 
    Thakur, P; Mannaday, V. K; Jiang, I; Sahu, D. K; Chand, S (Societe Royale des Sciences de Liege, 2018-04)
    We report the results of the transit timing variation (TTV) analysis of the extra-solar planet Qatar1b using thirty eight light curves. Our analysis combines thirty five previously available transit light curves with three ...
  • Investigating kinematics and dynamics of three open clusters towards Galactic anticentre 
    Rangwal, Geeta; Yadav, R. K. S; Bisht, D; Durgapal, Alok; Sariya, Devesh P (Oxford University Press on behalf of Royal Astronomical Society, 2023-08)
    We present the intracluster kinematics and dynamics of three open clusters: NGC 1193, NGC 2355, and King 12 by incorporating kinematical and photometric data from Gaia DR3, as well as a ground-based telescope. After ...

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