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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Interplanetary Scintillation 
    Alurkar, S. K (Indian Institute of Astrophysics, Bangalore, 1988)
    In this tutorial talk, the ground-based, inexpensive method of interplanetary scintillation (IPS) is described, starting with a general background of scattering of e.m. radiation in turbulent media. This is followed by the ...
  • Interpretation of the 'third harmonic' of the solar magnetic cycle 
    Gokhale, M. H; Javaraiah, J (International Astronomical Union, 1990)
    The behavior and significance of a third harmonic peak at about 3/22/y which is present in the spectra of all the odd degree axisymmetric modes with respect to the temporal frequency are investigated. The correlation between ...
  • An Interpretation of the Correlation in the Intensity Fluctuations in H and K of Ca II and b1 of Mg I 
    Sivaraman, K. R (D. Reidel Publishing Co., 1974-05)
  • An Interpretation of the Differences in the Solar Differential Rotation during Even and Odd Sunspot Cycles 
    Javaraiah, J; Bertello, L; Ulrich, R. K (The American Astronomical Society, 2005-06)
    Using the data on sunspot groups during the period 1879-2004, we have found that the solar equatorial rotation rate during the odd-numbered sunspot cycles is well correlated with the equatorial rotation rate of the preceding ...
  • An Interpretation of the Millisecond time variation in Hard X-ray solar flares 
    Krishan, V; Kundu, M. R (International Astronomical Union, 1985)
    Recent observations of the fast time variability in the hard X-ray emission from solar flares are interpreted. The fast spikes are assumed to be superimposed on the thermal X-ray emission. The rise and fall of a spike are ...
  • Interstellar dust studies with TAUVEX 
    Maheswar, G; Muthu, C; Sujatha, N. V; Pandey, G; Bhatt, H. C; Kameswara Rao, N; Murthy, J (Astronomical Society of India, 2007-06)
    We propose to carry out studies on the properties of inter- stellar dust using TAUVEX. Through the multi-band TAUVEX observations, particularly with the use of filters optimized for extinction observations of the 2175 ° ...
  • Interstellar extinction from photometric surveys: application to four high-latitude areas 
    Malkov, O; Karpov, S; Kilpio, E; Sichevsky, S; Chulkov, D; Dluzhnevskaya, O; Kovaleva, D; Kniazev, A; Mickaelian, A; Mironov, A; Murthy, J; Sytov, A; Zhao, G; Zhukov, A (De Gruyter, 2018-04)
    Information on interstellar extinction and dust properties may be obtained from modern large photometric surveys data. Virtual Observatory facilities allow users to make a fast and correct cross-identification of objects ...
  • Interstellar medium and star formation studies with the square kilometre array 
    Manoj, P; Vig, S; Maheswar, G; Kamath, U. S (Indian Academy of Sciences, 2016-12)
    Stars and planetary systems are formed out of molecular clouds in the interstellar medium. Although the sequence of steps involved in star formation are generally known, a comprehensive theory which describes the details ...
  • Interstellar shocked region chemistry - certain reactions between interstellar molecules and O and N atoms 
    Ghosh, K. K; Saleem, S. S; Kutty, K. N (International Astronomical Union, 1987)
    The reactions between O and N atoms and certain interstellar molecules (H/sub2S, NH/sub3, H/sub2CO, CH/sub3OH, C/sub2H/sub5OH) are studied using the dynamical flowing after glow method. It is found that NH and OH radicals ...
  • Intra-night optical variability characteristics of different classes of narrow-line seyfert 1 galaxies 
    Kshama, S. K; Paliya, Vaidehi S; Stalin, C. S (Oxford University Press on behalf of the Royal Astronomical Society, 2017-04)
    In a first systematic effort to characterize the intra-night optical variability (INOV) of different classes of narrow-line Seyfert 1 (NLSy1) Galaxies, we have carried out observations on a sample of radio-loud (RL) and ...
  • Intra-night optical variability monitoring of c-ray emitting blazars 
    Pandian, K Subbu Ulaganatha; Natarajan, A; Stalin, C. S; Pandey, Ashwani; Muneer, S; Natarajan, B (Indian Academy of Sciences, 2022-12)
    We present the results obtained from our campaign to characterize the intra-night optical variability properties of blazars detected by the Fermi large area telescope. This involves R-band monitoring observations of a ...
  • Intra-night Optical Variability Monitoring of Fermi Blazars: First Results from 1.3 m J. C. Bhattacharya Telescope 
    Paliya, Vaidehi S; Stalin, C. S; Ajello, M; Kaur, A (IOP Publishing, 2017-08)
    We report the first results obtained from our campaign to characterize the intra-night-optical variability (INOV) properties of Fermi detected blazars, using the observations from the recently commissioned 1.3 m J. ...
  • Intra-night optical variability of core dominated radio quasars: the role of optical polarization 
    Goyal, A; Gopal-Krishna; Wiita, P. J; Anupama, G. C; Sahu, D. K; Sagar, R; Joshi, S (EDP Sciences, 2012-08)
    Context. Rapid variations in optical flux are seen in many quasars and all blazars. The amount of variability in different classes of active galactic nuclei has been studied extensively but many questions remain unanswered. ...
  • Intra-night optical variability of misaligned active galaxies 
    Bhattacharya, Debbijoy; Gulati, S; Stalin, C. S (Oxford University Press on behalf of the Royal Astronomical Society, 2019-03)
    The majority of the γ-ray sources detected by the Fermi Gamma-ray Space Telescope belong to the blazar class of active galactic nuclei (AGNs). In addition to blazars, a minority of non-blazar AGNs is also found to be γ-ray ...
  • Intra-night optical variability of misaligned active galaxies 
    Bhattacharya, Debbijoy; Gulati, S; Stalin, C. S (Oxford University Press on behalf of the Royal Astronomical Society, 2019-03)
    The majority of the γ-ray sources detected by the Fermi Gamma-ray Space Telescope belong to the blazar class of active galactic nuclei (AGNs). In addition to blazars, a minority of non-blazar AGNs is also found to be γ-ray ...
  • 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 ...

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