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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Accretion disc sizes from continuum reverberation mapping of AGN selected from the ZTF survey 
    Jha, Vivek Kumar; Joshi, Ravi; Chand, Hum; Wu, Xue-Bing; Ho, Luis C; Rastogi, Shantanu; Ma, Qinchun (Oxford University Press on behalf of Royal Astronomical Society, 2022-04)
    We present the accretion disc-size estimates for a sample of 19 active galactic nuclei (AGNs) using the optical g-, r-, and i-band light curves obtained from the Zwicky Transient Facility survey. All the AGNs have reliable ...
  • Accretion flow properties of GRS 1716-249 during its 2016–17 failed outburst 
    Chatterjee, Kaushik; Debnath, Dipak; Chatterjee, Debjit; Jana, Arghajit; Sujoy Kumar Nath; Bhowmick, Riya; Chakrabarti, S. K (Springer Nature, 2021-07)
    In 2016–17, the Galactic transient black hole candidate GRS 1716-249 exhibited an outburst event after a long quiescence period of almost 23 years. The source remained in the outbursting phase for almost 9 months. We study ...
  • Accretion flow properties of GRS 1915+105 during Its θ class using AstroSat data 
    Banerjee, Anuvab; Bhattacharjee, Ayan; Chatterjee, Debjit; Debnath, Dipak; Chakrabarti, S. K; Katoch, Tilak; Antia, H. M (IOP Publishing, 2021-08-01)
    The Galactic microquasar GRS 1915+105 shows rich variability that is categorized into different classes. In this paper, we report the temporal and spectral analysis of GRS 1915+105 to study the properties of the accretion ...
  • Accretion flow properties of MAXI J1910-057/Swift J1910.2–0546 during its 2012–13 outburst 
    Nath, Sujoy Kumar; Debnath, Dipak; Chatterjee, Kaushik; Jana, Arghajit; Chatterjee, Debjit; Bhowmick, Riya (Elsevier B.V, 2023-01-01)
    Galactic black hole candidate MAXI J1910-057/Swift J1910.2–0546 was simultaneously discovered by MAXI/GSC and Swift/BAT satellites during its first outburst in 2012. We study the detailed spectral and temporal properties ...
  • Accretion properties of MAXI J1813-095 during its failed outburst in 2018 
    Jana, Arghajit; Jaisawal, G. K; Naik, Sachindra; Neeraj Kumari; Chatterjee, Debjit; Chatterje, Kaushik; Bhowmick, Riya; Chakrabarti, S. K; Chang, H.-K; Debnath, Dipak (IOP Publishing, 2021-05)
    We present the results obtained from detailed timing and spectral studies of a black hole candidate MAXI J1813–095 using Swift, NICER, and NuSTAR observations during its 2018 outburst. The timing behavior of the source is ...
  • 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 ...
  • Accurate Calculations of Interstellar Lines of Mg+ Using the Coupled Cluster Approach 
    Majumder, S; Merlitz, H; Gopakumar, G; Das, B. P; Mahapatra, U. S; Mukherjee, Debashis (The American Astronomical Society., 2002-07)
    One of the most successful ab initio, highly correlated all-order many-body methods, the relativistic coupled cluster theory, is employed to calculate excitation energies of the doublet states of Mg+ and allowed transitions ...
  • Accurate Estimates of Circumstellar and Interstellar Lines of Quadruply Ionized Vanadium Using the Coupled Cluster Approach 
    Dixit, G; Sahoo, B. K; Deshmukh, P. C; Chaudhuri, R. K; Majumder, S (University of Chicago Press, 2007-10)
    Accurate ab initio calculations have been carried out to study the valence electron removal energies and oscillator strengths of astrophysically important electromagnetic transitions of quadruply ionized vanadium, V4+. ...
  • Acoustic Emission From Magnetic Flux Tubes in the Solar Network 
    Vigeesh, G; Hasan, S. S (IOP Publishing, 2013)
    We present the results of three-dimensional numerical simulations to investigate the excitation of waves in the magnetic network of the Sun due to foot point motions of a magnetic flux tube. We consider motions that typically ...
  • Active and adaptive optics for the new generation of large telescopes 
    Saxena, A. K; Love, G (Indian Academy of Sciences, 1994-03)
  • The Active Chromospheres of Lithium-rich Red Giant Stars* 
    Sneden, Christopher; Afsar, Melike; Bozkurt, Zeynep; Adamow, Monika; Mallick, Anohita; Reddy, B. E; Janowiecki, Steven; Mahadevan, Suvrath; Bowler, Brendan P; Hawkins, Keith; Lind, Karin; Dupree, Andrea K; Ninan, Joe P; Nagarajan, Neel; Topcu, Gamze Bocek; Froning, Cynthia S; Bender, Chad F; Terrien, Ryan; Ramsey, Lawrence W; Mace, Gregory N (American Astronomical Society, 2022-11-20)
    We have gathered near-infrared zyJ-band high-resolution spectra of nearly 300 field red giant stars with known lithium abundances in order to survey their He I λ10830 absorption strengths. This transition is an indicator ...
  • Active Galactic Nuclei and Galaxy Formation 
    Chokshi, A (The American Astronomical Society, 1997-12)
    It is proposed that early jet-induced activity around active galactic nuclei (AGNs) is responsible for triggering large-scale star formation in protogalaxies and results in the formation of giant ellipticals and spheroids ...
  • Active galactic nucleus activity and black hole masses in low surface brightness galaxies 
    Ramya, S; Prabhu, T. P; Mousumi Das (Wiley-Blackwell, 2011-12)
    We present medium resolution optical spectroscopy of a sample of nine low surface brightness (LSB) galaxies. For those that show clear signatures of active galactic nucleus (AGN) emission, we have disentangled the AGN ...
  • Active galactic nucleus feedback in NGC 3982 
    Joseph, P; George, K; Paul, K. T (EDP Sciences, 2022-11)
    The energetic feedback from supermassive black holes can influence star formation at the centres of galaxies. Observational evidence for active galactic nucleus (AGN) impact on star formation can be searched for in galaxies ...
  • Active galaxies and their importance: results from imaging them in the UV 
    Shastri, P (Astronomical Society of India, 2007-06)
    The current phenomenology of active galaxies is briefly outlined. Their significance in the larger context of galaxy formation and evolution is de- scribed. Recent ultraviolet imaging results are then summarized in the ...
  • Active nucleus in a post-starburst galaxy: KUG 1259+280 
    Dewangan, G. C; Singh, K. P; Mayya, Y. D; Anupama, G. C (The Royal Astronomical Society, 2000-10)
    We report the discovery of an active nucleus in a post-starburst galaxy, KUG 1259+280, based on its X-ray and optical characteristics. The X-ray source in KUG 1259+280 was detected during a search for ultrasoft sources in ...
  • Active prominences and associated terrestrial effects 
    Narayana, J. V (Government Observatory, Madras, 1963-10)
  • Activity dependence of solar supergranular fractal dimension 
    Paniveni, U; Krishan, V; Singh, J; Srikanth, R (Blackwell Publishing, 2010-02)
    We study the complexity of supergranular cells using the intensity patterns obtained at the Kodaikanal Solar Observatory during the solar maximum. Our data consist of visually identified supergranular cells, from which a ...
  • The activity in the isolated T Tauri binary V4046 Sagittarii 
    Mekkaden, M. V (International Astronomical Union, 2000)
    New photometric, spectroscopic and polarimetric observations of the T Tauri binary V4046 Sgr are presented. An analysis of the observations obtained over several seasons enabled us to determine the photometric period, and ...
  • Activity of the first interstellar comet 2I/Borisov around perihelion: results from Indian observatories 
    Aravind, K; Ganesh, Shashikiran; Venkataramani, Kumar; Sahu, D. K; Angchuk, D; Sivarani, T; Unni, Athira (Oxford University Press on behalf of the Royal Astronomical Society, 2021-04)
    Comet 2I/Borisov is the first true interstellar comet discovered. Here, we present results from observational programs at two Indian observatories, 2 m Himalayan Chandra Telescope at the Indian Astronomical Observatory, ...

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