Browsing by Title

Sort by: Order: Results:

  • Gamma ray and hadron generated Cverenkov photon spectra at various observation altitudes 
    Rahman, M. A; Bhat, P. N; Acharya, B. S; Chitnis, V. R; Majumdar, P; Vishwanath, P. R (Astronomical Society of India, 2002)
    We have studied the propagation of Cverenkov photons generated by Very High Energy gamma-rays and hadrons in the atmosphere. Photon production height distributions derived from semi-empirical methods agree with those ...
  • Gamma ray astronomy : New Indian initiatives 
    Bhat, C. L (Astronomical Society of India, 2000)
    In this brief review, major new initiatives presently under implementation in India in the field of gamma-ray astronomy are discussed in the backdrop of the just-concluded exploratory phase in the field.
  • Gamma Ray Astronomy in the Forefront again? 
    Lavakare, P. J (Astronomical Society of India, 1973)
  • Gamma Ray Burst Data Analysis: Algorithms and Procedure 
    Sinha, S (Astronomical Society of India, 2003)
    In Gamma Ray Burst experiments it is very important to obtain realistic and accurate estimates of the Burst parameters, viz. the event trigger time, the duration, peak hardness ratio, peak fluxes and fluences in different ...
  • The Gamma Ray Burst experiment on the Indian SROSS C-2 satellite 
    Sinha, S; Sreekumar, P; Kasturirangan, K (Astronomical Society of India, 2001)
    The SROSS C-2 satellite launched by the ASLV carried aloft a CsI gamma ray burst detector. To date, 51 GRB events have been detected unambiguously with 22 being common with BATSE. The experiment with its 2 ms time resolution, ...
  • Gamma ray bursts at high energies : detection ranges and event rates 
    Shanthi, K; Kaul, C. L; Kaul, R. K; Tickoo, A. K; Bhat, C. L (Astronomical Society of India, 2002)
    The Gamma-Ray Burst (GRB) detection rates at energies ? 20GeV, have been estimated for the 3 atmospheric Cerenkov telescope systems of the GRACE project at Mt. Abu, under the assumption that the bursts have a cosmological ...
  • Gamma ray effect on life 
    Sivaram, C (Deccan Herald, 2007-01-09)
  • Gamma ray observations of polars 
    Bhat, C. L (Astronomical Society of India, 1990)
    Experimental evidence is reported for the discovery of an entirely new class of gamma-ray binary objects involving a magnetic white dwarf rather than a neutron star degenerate primary. These sources may have photon energies ...
  • Gamma ray production in SNR's -contribution from photomeson process 
    Bhattacharya, S; Kaul, R. K; Kaul, C. L; Bhat, C. L (Astronomical Society of India, 1999)
    We estimate the integral γ-ray fluxes above 10 MeV photon energy, likely to result from neutral pion decay, following photomeson interactions between ultra-high energy protons accelerated in Supernova Remnants (SNR) and ...
  • Gamma ray telescope getting ready in Leh 
    Sunderarajan, P (The Hindu, 2011-06-18)
  • Gamma-hadron separation using Cverenkov photon density fluctuations 
    Chitnis, V. R; Bhat, P. N (Astronomical Society of India, 2002)
    In atmospheric Cverenkov technique gamma-rays are detected against abundant background produced by hadronic showers. In order to improve signal to noise ratio of the experiment, it is necessary to reject a significant ...
  • Gamma-ray astronomy activities in BARC - an introductory note 
    Razdan, H (Astronomical Society of India, 1997)
  • Gamma-ray astronomy activities in BARC - Past contributions and present challenges 
    Razdan, H; Bhat, C. L (Astronomical Society of India, 1997)
    It was in the early seventies that we made a modest start in the Nuclear Research Laboratory (NRL) of the Bhabha Atomic Research Centre (BARC) in the then-budding field of observational gamma-ray astronomy by setting up ...
  • 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 ...
  • The Gap in the H-R Diagram of Open Clusters with Special Reference to NGC 2169, NGC 1778 and Tr I 
    Sagar, R; Joshi, U. C (Astronomical Society of India, 1978-06)
    The colour-magnitude diagrams of the open clusters NGC 1778 and Tr I indicate the presence of gaps on the rising branches of the evolving main sequnces. The positions of these gaps are compared with those found in other ...
  • 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 and dust in the Magellanic clouds 
    Ananta Charan Pradhan (Indian Institute of Astrophysics, 2011-04)
  • 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 ...

Search DSpace

Browse

My Account