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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • The galactic R coronae borealis stars and the final he-shell flash object V4334Sgr (Sakurai’s object): a comparison 
    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 ...
  • The Galactic R Coronae Borealis Stars: The C2 Swan Bands, the Carbon Problem, and the 12C/13C Ratio 
    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. ...
  • The galactic thick disk: an observational perspective 
    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 ...
  • Galaxy dynamics with small computers: Some results on tidal interactions. 
    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 ...
  • Galaxy flybys: evolution of the bulge, disc, and spiral arms 
    Ankit Kumar; Mousumi Das; Kataria, Sandeep Kumar (Oxford University Press on behalf of the Royal Astronomical Society, 2021-09)
    Galaxy flybys are as common as mergers in low-redshift Universe and are important for galaxy evolution as they involve the exchange of significant amounts of mass and energy. In this study, we investigate the effect of ...
  • Galaxy Forum South America-Argentina 2020 
    Durst, S; Safonova, M; Paolantonio, S; Colazo, M. E; Li, G (Cambridge University Press on behalf of International Astronomical Union, 2021-12)
    Galaxy Forum (GF) South America 2020, was held virtually on December 8, 2020 on the opening eve of IAU 367 by the International Lunar Observatory Association (ILOA Hawai’i) with the support of the Instituto de Tecnolog´ıas ...
  • Galaxy outflows without supernovae 
    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 ...
  • Galex diffuse observations of the sky: the data 
    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 ...
  • GALEX Observations of Diffuse Ultraviolet Emission from Draco 
    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 ...
  • GALEX observations of diffuse UV radiation at high spatial resolution from the Sandage Nebulosity 
    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 ...
  • Gamma-Ray Blazars within the first 2 billion years 
    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 ...
  • Gamma-ray source observations with the HAGAR telescope system at Hanle in the Himalayas 
    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 ...
  • Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies in the Sloan Digital Sky Survey 
    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 ...
  • A Gap in the Highest Energy Cosmic Ray Spectrum as a Signature of Unification Scale Physics 
    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 ...
  • Gas infalling motions in the envelopes of very low luminosity objects 
    Kim, Mi-Ryang; Lee, Chang Won; Maheswar, G; Myers, Philip C; Kim, Gwanjeong (IOP Publishing, 2021-04-01)
    We present the results of a single-dish survey toward 95 very low luminosity objects (VeLLOs) in optically thick (HCN 1−0) and thin (N2H+ 1−0) lines performed for the purpose of understanding the physical processes ...
  • Gaseous outflows in seyferts and unification 
    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 ...
  • Gaseous outflows in Seyferts and unification: The case of Mrk 533 
    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 ...
  • GASP XVIII: star formation quenching due to AGN feedback in the central region of a jellyfish galaxy 
    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 ...
  • GASP XXIII: A Jelly fi sh Galaxy as an Astrophysical Laboratory of the Baryonic Cycle 
    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 ...
  • GASP. XV. A MUSE view of extreme ram-pressure stripping along the line of sight: physical properties of the jellyfish galaxy JO201 
    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 ...

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