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Browsing IIAP Publications by Title

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  • WISE view of narrow-line Seyfert 1 galaxies: mid-infrared colour and variability 
    Rakshit, S; Johnson, A; Stalin, C. S; Gandhi, Poshak; Hoenig, Sebastian (Oxford University Press on behalf of the Royal Astronomical Society, 2019-02)
    We present the colour and flux variability analysis at 3.4 μm (W1 band) and 4.6 μm (W2 band) of 492 narrow-line Seyfert 1 (NLSy1) galaxies using archival data from the Wide-field Infrared Survey Explorer (WISE). In the ...
  • Witnessing the star formation quenching in L* ellipticals 
    Dhiwar, Suraj; Saha, Kanak; Dekel, Avishai; Paswan, Abhishek; Pandey, Divya; Cortesi, Arianna; Pandge, Mahadev (Oxford University Press on behalf of Royal Astronomical Society, 2023-02)
    We study the evolution of L∗ elliptical galaxies in the colour–magnitude diagram in terms of their star formation history and environment, in an attempt to learn about their quenching process. We have visually extracted ...
  • WKB Analysis of Axisymmetric Magneto-Rotational Instability in a Thin Accretion Disk 
    Furukawa, M; Krishan, V; Hirota, M; Yoshida, Z (The Japan Society of Plasma Science and Nuclear Fusion Research, 2006)
    The temporal behavior of axisymmetric magneto-rotational instability in a thin accretion disk is analyzed via the Wentzel-Kramars-Brillouin (WKB) method. The height of the thin disk is used as a small parameter. It is found ...
  • The Wolf-Rayet binary HD 68273 
    Ganesh, K. S; Bappu, M. K. V (Kodaikanal Observatory, 1967-10)
  • The Wolf-Rayet eclipsing binary HD 193576 
    Ganesh, K. S; Bappu, M. K. V; Natarajan, V (Kodaikanal Observatory, 1967-10)
  • The Wolf-Rayet Spectrscopic Binary HD 214419 
    Bappu, M. K. V; Visvanadham, P (Indian Institute of Astrophysics, Bangalore, 1977)
    Velocity curves of the system HD 214419 are obtained for the N IV 4058 and He II 4686 emission lines from prismatic spectra taken in 1951 and 1952. The emission and absorption features experience several phase dependent ...
  • Workshop I – Black holes and compact objects: Classical aspects 
    Ramachandra, B. S; Vishveshwara, C. V (Indian Academy of Sciences, 2000-10)
    This is a summary of the papers presented in session W1 on the papers submitted to the workshop I on the classical aspects of black holes and compact objects were classified into three categories: (i) theoretical aspects; ...
  • Workshop I: gender studies 
    Hennessey, E; Kurup, A; Meza-Montes, L; Shastri, P; Ghose, S (AIP Publishing, 2015-05)
    Participants in the Gender Studies workshop of the 5th IUPAP International Conference on Women in Physics discussed the gender question in science practice from a policy perspective, informed by investigations ...
  • Workshop report: Intersecting identities gender and intersectionality in physics 
    Hennessey, Eden; Cole, Joanne; Shastri, P; Esquivel, Jessica; Singh, Chandralekha; Johnson, Rosie; Ghose, Shohini (AIP Publishing, 2019-06)
    The concept of intersectionality refers to how our various social identities (e.g., gender, race, class) overlap to create power, privilege, or marginalization. We report on a workshop held at the International Conference ...
  • A world-wide net of solar radio Spectrometers: e-CALLISTO 
    Benz, A. O; Monstein, C; Meyer, H; Manoharan, P. K; Ramesh, R; Altyntsev, A; Lara, A; Paez, J; Cho, K.S (Springer, 2009-04)
    Radio spectrometers of the CALLISTO type to observe solar flares have been distributed to nine locations around the globe. The instruments observe automatically, their data is collected every day via internet and stored ...
  • X - ray spectrometers on - board Aditya - L1 for solar flare studies 
    Sankarasubramanian, K; Sudhakar, M; Sudhakar, M; Nandi, Anuj; Ramadevi, M. C; Adoni, A. A; Kushwaha, A; Agarwal, Anil; Dey, A; Joshi, B; Singh, Brajpal||Girish, V; Tomar, I; Majhi, K. K; Kumar; Olekar, Manjunath; Bug, M; Pala, Manohar; Thakur, Mukund Kumar; Badagandi, Rajeev R; Ravishankar, B. T; Garg, Sarthak; Sitaramamurthy, N; Sridhara, N; Umapathy, C. N; Gupta, Vinod Kumar; Agrawal, Vivek Kumar; Yougandar, B (Current Science Association, 2017-04)
    Aditya-L1 mission will carry two high-spectral resolution X-ray spectrometers to study solar flares. The soft X-ray spectrometer will cover the energy range from 1 to 30 keV, while the hard X-ray spectrometer will cover ...
  • X - ray spectrometers on - board Aditya - L1 for solar flare studies 
    Sankarasubramanian, K; Sudhakar, M||Nandi, Anuj; Ramadevi, M. C; Adoni, A. A; Kushwaha, A; Agarwal, Anil; Dey, A; Joshi, B; Singh, Brajpal; Girish, V; Tomar, I; Majhi, K. K; Kumar; Olekar, Manjunath; Bug, M; Pala, Manohar; Thakur, Mukund Kumar; Badagandi, Rajeev R; Ravishankar, B. T; Garg, Sarthak|; Sitaramamurthy, N; Sridhara, N; Umapathy, C. N; Gupta, Vinod Kumar; Agrawal, Vivek Kumar; Yougandar, B (Current Science Association, 2017-08)
    Aditya-L1 mission will carry two high-spectral resolution X-ray spectrometers to study solar flares. The soft X-ray spectrometer will cover the energy range from 1 to 30 keV, while the hard X-ray spectrometer will cover ...
  • X Ray Studies of Active Galactic Nuclei 
    Soundararajaperumal, S (Indian Institute of Astrophysics, Bangalore, 1999)
  • X-ray and optical properties of broad absorption line quasars in the Canada–France–Hawaii Telescope Legacy Survey 
    Stalin, C. S; Srianand, R; Petitjean, P (Wiley-Blackwell, 2011-05)
    We study the X-ray and optical properties of 16 broad absorption line (BAL) quasars detected in a ≈3 deg2 region common to the wide synoptic (W-1) component of the Canada–France–Hawaii Telescope Legacy Survey (CFHTLS) and ...
  • The X-Ray and Radio Loud Fast Blue Optical Transient AT2020mrf: Implications for an Emerging Class of Engine-driven Massive Star Explosions 
    Yao, Yuhan; Ho, Anna Y. Q; Medvedev, Pavel; Nayana, A. J; Perley, Daniel A; Kulkarni, S. R; Chandra, Poonam; Sazonov, Sergey; Gilfanov, Marat; Khorunzhev, Georgii; Khatami, David K; Sunyaev, Rashid (American Astronomical Society, 2022-08-01)
    We present AT2020mrf (SRGe J154754.2+443907), an extra-galactic (z = 0.1353) fast blue optical transient (FBOT) with a rise time of tg,rise = 3.7 days and a peak luminosity of Mg,peak = −20.0. Its optical spectrum ...
  • X-Ray and Ultraviolet Flares on AT Microscopii Observed by AstroSat 
    Kuznetsov, A. A; Karakotov, R. R; Chandrashekhar, K; Banerjee, D (IOP Publishing, 2023-01)
    We present observations of the active M-dwarf binary AT Mic (dM4.5e+dM4.5e) obtained with the orbital observatory AstroSat. During 20 ks of observations, in the far-ultraviolet (130–180 nm) and soft X-ray (0.3–7 keV) spectral ...
  • X-ray attenuation coefficient of mixtures: Inputs for dual-energy CT 
    Haghighi, R. R; Chatterjee, S; Vyas, A; Pratik Kumar; Thulkar, S (American Association of Physicists in Medicine, 2011-10)
    The attenuation coefficient, μ(E) of substances, at any energy (E) of the x-ray photon, is known to depend on the electron density (ρe) and the effective atomic number (Zeff) of the material. While the dependence on ρe is ...
  • X-ray confirmation of the intermediate polar IGR J16547-1916 
    Joshi, A; Wang, W; Pandey, J. C; Singh, K. P; Naik, S; Raj, A; Anupama, G. C; Rawat, N (EDP Sciences, 2022-01)
    Using X-ray observations from the NuSTAR and Swift satellites, we present temporal and spectral properties of an intermediate polar (IP) IGR J16547-1916. A persistent X-ray period at ∼546 s confirming the optical spin ...
  • X-ray continuum with an iron emission line from the radio-quiet quasar PHL 909 
    Ghosh, K. K; Soundararajaperumal, S (University of Chicago Press, 1992-04)
    Results of the spectral analysis of the X-ray (0.1-10 keV) spectrum of the radio-quiet quasar, PHL 909, are presented. A spectrum of this quasar, which was observed on 1984/349, was obtained from the Exosat archives. ...
  • X-ray emission from seyfert galaxies: surroundings of their supermassive black holes 
    Singh, V; Shastri, P (American Institute of Physics, 2008-08)
    We study the systematics of the X-ray emission from Seyfert nuclei in the frame work of unification. In order to do this rigorously a sample with types 1 and 2 matched in orientation-independent parameters is studied. The ...

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