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Browsing IIAP Publications by Title

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  • Prabhu, T. P; Mayya, Y. D; Anupama, G. C (Indian Academy of Sciences, 1992-03)
    The system gain of two CCD systems in regular use at the Vainu Bappu Observatory, Kavalur, is determined at a few gain settings. The procedure used for the determination of system gain and base-level noise is described in ...
  • Nittler, L. R; Cowsik, R (The American Physical Society, 1997-01)
    The sup16Osup/17 supO and sup16O/sup18O ratios of refractory oxide grains extracted from primitive meteorites suggest that they originated in low-mass red giant stars prior to the formation of the Solar System 4.6×10/sup9 ...
  • Hema, B. P; Pandey, G; Lambert, D. L (Proceedings of Science, 2012-08)
    The high resolution optical spectra of H-deficient stars, R Coronae Borealis stars and H-deficient carbon stars are analyzed by synthesizing the C2 Swan bands (0,1), (0,0), and (1,0) using our detailed line-list and ...
  • Hema, B. P; Pandey, G; Lambert, D. L (IOP Publishing, 2012-03-10)
    Observed spectra of R Coronae Borealis (RCB) and hydrogen-deficient carbon (HdC) stars are analyzed by synthesizing the C2 Swan bands (1, 0), (0, 0), and (0, 1) using our detailed line list and the Uppsala model atmospheres. ...
  • Reddy, B. E (Cambridge University Press, 2010-03)
    In this review, we present a brief description of observational efforts to understand the Galactic thick disk and its relation to the other Galactic components. This review primarily focused on elemental abundance patterns ...
  • Kochhar, R. K; Namboodiri, P. M. S (Springer Netherlands, 1995-06)
    Numerical simulations with a small computer have been performed to investigate the tidal influence of a larger galaxy on a smaller companion. A criterion is developed for disruption of the satellite galaxy. The behaviour ...
  • Sur, Sharanya; Scannapieco, E; Ostriker, E. C (IOP Publishing, 2016-02)
    High surface density, rapidly star-forming galaxies are observed to have ≈ 50 – 100 km s − 1 line of sight velocity dispersions, which are much higher than expected from supernova driving alone, but may arise from ...
  • Murthy, J (IOP Publishing, 2014-08)
    I present tabulations of the diffuse observations made by the GALEX spacecraft in two UV bands (FUV: 1539 Å and NUV: 2316 Å) from the (almost) final data release of the GALEX spacecraft (GR6/GR7). This data release includes ...
  • Sujatha, N. V; Murthy, J; Suresh, R; Henr, R. C; Bianchi, L (IOP Publishing, 2010-11-10)
    We have studied small-scale (2') spatial variation of the diffuse ultraviolet (UV) radiation using a set of 11 Galaxy Evolution Explorer deep observations in the constellation of Draco. We find a good correlation between ...
  • Sujatha, N. V; Murthy, J; Karnataki, A; Henry, R. C; Bianchi, L (The American Astronomical Society, 2009-02)
    We have observed a region of nebulosity first identified as starlight scattered by interstellar dust by Sandage using the Galaxy Evolution Explorer (GALEX) ultraviolet imaging telescope. Apart from airglow and zodiacal ...
  • Ackermann, M; Ajello, M; Baldini, L; Ballet, J; Barbiellini, G; Bastieri, D; Becerra Gonzalez, J; Bellazzini, R; Bissaldi, E; Blandford, R. D; Bloom, E. D; Bonino, R; Bottacini, E; Bregeon, J; Bruel, P; Buehler, R; Buson, S; Cameron, R. A; Caragiulo, M; Caraveo, P. A; Cavazzut, E; Cecchi, C; Cheung, C. C; Chiang, J; Chiaro, G; Ciprini, S; Conrad, J; Costantin, D; Costanza, F; Cutini, S; D'Ammando, F; de Palma, F; Desiante, R; Digel, S. W; Di Lalla, N; Di Mauro, M; Di Venere, L; Domi­nguez, A; Drell, P. S; Favuzzi, C; Fegan, S. J; Ferrara, E. C; Finke, J; Focke, W. B; Fukazawa, Y; Funk, S; Fusco, P; Gargano, F; Gasparrini, D; Giglietto, N; Giordano, F; Giroletti, M; Green, D; Grenier, I. A; Guillemo, L; Guiriec, S; Hartmann, D. H; Hays, E; Marcotulli, L; Horan, D; Jogler, T; Johannesson, G; Johnson, A. S; Kuss, M; Mura, G. La; Larsson, S; Latronico, L; Li, J; Longo, F; Mazziotta, M. N; Loparco, F; Lovellette, M. N; Lubrano, P; Magill, J. D; Maldera, S; Manfreda, A; Michelson, P. F; Mirabal, N; Mitthumsiri, W; Mizuno, T; Monzani, M. E|; Morselli, A; Moskalenko, I. V; Negro, M; Rando, R; Nuss, E; Ohsugi, T; Ojha, R; Omodei, N; Orienti, M; Orlando, E; Ormes, J. F; Paliya, V. S; Paneque, D; Perkins, J. S; Rani, B; Persic, M; Pesce-Rollins, M; Piron, F; Porter, T. A; Principe, G; Raino, S; Razzano, M; Razzaque, S; Reimer, A; Reimer, O; Roman, R. W; Sgro, C; Simone, D; Siskind, E. J; Spada, F; Spandre, G; Spinelli, P; Stalin, C. S; 12 others (IOP Publishing, 2017-03-01)
    The detection of high-redshift ($z\,\gt 3$) blazars enables the study of the evolution of the most luminous relativistic jets over cosmic time. More importantly, high-redshift blazars tend to host massive black holes and ...
  • Britto, R. J; Acharya, B. S; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Mahesh, P. K; Nagesh, B. K; Naidu, A; Parmar, N. K; Prabhu, T. P; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tsewang, D; Upadhya, S. S; Vishwanath, P. R (Societe Francaise d’Astronomie et dAstrophysique, 2009-11)
    We have observed Crab nebula using the recently commissioned wavefront sampling high alti- tude (4270 m) array, HAGAR, at Hanle in the Ladakh region of the Himalayas. Regular source observations have begun with the ...
  • Paliya, Vaidehi S; Ajello, M; Rakshit, S; Amit Kumar; Stalin, C. S; Kaur, A; Hartmann, D (IOP Publishing, 2018-01)
    The detection of signi fi cant γ -ray emission from radio-loud narrow-line Seyfert 1 ( NLSy1s ) galaxies enables us to study jets in environments different than those in blazars. However, due to the small number ...
  • Sigl, G; Lee, S; Schramm, D. N; Bhattacharjee, P (American Association for the Advancement of Science, 1995-12)
    Recent experimental data seem to indicate that there is significant structure in the cosmic ray spectrum above 1018 electron volts (eV). Besides a dip at ~5 x 1018 eV, two events above 2 x 1020 eV have been observed. The ...
  • Shastri, P; Hutchings, J; Murthy, J; Wills, B. J (Astronomical Society of the Pacific, 2006-06)
    We present our results from FUSE observations of Seyfert galaxies of type 2 (Sy 2). We attempt to contrast the properties of the emission lines and absorbing outflows in Sy 1s and 2s in the framework of Unification. We ...
  • Shastri, P; Murthy, J; Hutchings, J; Wills, B. J (Cambridge University Press, 2004-11)
    We present our recent results from the observation of the O VI λ λ1032,1038 emission doublet in Seyfert galaxies of type 2 with the FUV spectrograph on the FUSE satellite. These observations are part of our investigation ...
  • George, K; Poggianti, B. M; Bellhouse, C; Radovich, M; Fritz, J; Paladino, R; Bettoni, R D; Jaff, Y; Moretti, A; Gullieuszik, M; Vulcani, B; Fasano, G; Stalin, C. S; Subramaniam, A; Tandon, S. N (Oxford University Press on behalf of the Royal Astronomical Society, 2019-08)
    We report evidence for star formation quenching in the central 8.6 kpc region of the jellyfish galaxy JO201 that hosts an active galactic nucleus (AGN), while undergoing strong ram-pressure stripping. The ultraviolet imaging ...
  • Poggianti, Bianca M.; Ignesti, Alessandro; Gitti, Myriam Gitti; Wolter, Anna; Brighenti, abrizio; Biviano, Andrea; George, K; Vulcani, enedetta; Gullieuszik, Marco; Moretti, Alessia; Paladino, Rosita; Bettoni, Daniela; Franchetto, Andrea; Jaffe, Yara L.; Radovich, Mario; Roediger, Elke; Tomicic, Neven; Tonnesen, Stephanie (IOP Publishing, 2019-12)
    With MUSE, Chandra , VLA, ALMA, and UVIT data from the GAS P program, we study the multiphase baryonic components in a jelly fi sh galaxy ( JW100 ) with a stellar mass 3.2 × 10 11 M e hosting an active ...
  • Bellhouse, C; Jaffe, Y. L; McGee, S. L; Poggianti, B. M; Smith, R; Tonnesen, S; Fritz, J; Hau, G. K .T; Gullieuszik, M; Vulcani, B; Fasano, G G; Moretti, A; George, K; Bettoni, D; nofrio, O, M.D; Omizzolo, A; Sheen, Y.K (Oxford University Press on behalf of the Royal Astronomical Society, 2019-05)
    We present a study of the physical properties of JO201, a unique disc galaxy with extended tails undergoing extreme ram-pressure stripping (RPS) as it moves through the massive cluster Abell 85 at supersonic speeds mostly ...
  • Kishore, P; Kathiravan, C; Ramesh, R; Rajalingam, M; Barve, Indrajit V (Springer, 2014-10)
    A new radio spectrograph, dedicated to observe the Sun, has been recently commissioned by the Indian Institute of Astrophysics (IIA) at the Gauribidanur Radio Observatory, about 100 km North of Bangalore. The instrument, ...

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