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Browsing by Subject "Gamma-rays: galaxies"

Browsing by Subject "Gamma-rays: galaxies"

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  • Rajput, Bhoomika; Stalin, C. S; Sahayanathan, S (Oxford University Press on behalf of the Royal Astronomical Society, 2020-11)
    Blazars are known to show flux variations over a range of energies from low-energy radio to high-energy γ-rays. Cross-correlation analysis of the optical and γ-ray light curves in blazars shows that flux variations are ...
  • Pandey, Ashwani; Bhoomika, R; Stalin, C. S (Oxford University Press on behalf of Royal Astronomical Society, 2022-02)
    Study of the polarization behaviour in blazars is a powerful tool to discern the role of the magnetic field in the variable emission process in their relativistic jets. We present here the results of our systematic ...
  • Rajput, Bhoomika; Mandal, Amit Kumar; Pandey, Ashwani; Stalin, C. S; Max-Moerbeck, Walter; Mathew, Blesson (Published by Oxford University Press on behalf of Royal Astronomical Society, 2024-02)
    The correlation between optical and γ-ray flux variations in blazars reveals a complex behaviour. In this study, we present our analysis of the connection between changes in optical and γ-ray emissions in the blazar Ton ...
  • Gulati, Sanna; Bhattacharya, Debbijoy; Bhattacharyya, Subir; Bhatt, N; Stalin, C. S; Agrawal, V. K (Oxford University Press on behalf of the Royal Astronomical Society, 2021-05)
    We carried out a detailed study of the temporal and broad-band spectral behaviour of one of the brightest misaligned active galaxies in γ-rays, NGC 1275, utilizing 11 years of Fermi data and the available Swift and AstroSat ...
  • Gulati, Sanna; Bhattacharya, Debbijoy; Ramadevi, M. C; Stalin, C. S; Sreekumar, P (Oxford University Press on behalf of Royal Astronomical Society, 2023-05)
    A comprehensive study of the nucleus and western hotspot of Pictor A is carried out using AstroSat observations, 13 yr of Fermi, and archival Swift observations along with other published data. We report the first detection ...
  • Acciari, V A; Ansoldi, S; Antonelli, L A; Engels, A Arbet; Artero, M; Asano, K; Baack, D; Babic, A; Baquero, A; Almeida, U Barres de; Barrio, J A; Sahakyan, N; Saito, T; Sakurai, S; Satalecka, K; Saturni, F G; Bernardos, M; Schleicher, B; Schmidt, K; Schweizer, T; Will, M; Green, D; Sitarek, J; Šnidarić, I; Sobczynska, D; Spolon, A; Stamerra, A; Strom, D; Strzys, M; Berti, A; Suda, Y; Surić, T; Hadasch, D; Bhattacharyya, W; Takahashi, M; Tavecchio, F; Temnikov, P; Terzić, T; Teshima, M; Tosti, L; Truzzi, S; Tutone, A; Besenrieder, J; Hahn, A; Ubach, S; López-Oramas, A; Wunderlich, C; Zarić, D; de Palma, F; D’Ammando, F; Barnacka, A; Sahu, D K; Hodges, M; Hovatta, T; Heckmann, L; Kiehlmann, S; Max-Moerbeck, W; Loporchio, S; Bigongiari, C; Readhead, A C S; Reeves, R; Pearson, T J; Lähteenmäki, A; Björklund, I; Tornikoski, M; Herrera, J; Tammi, J; Suutarinen, S; Hada, K; Fraga, B Machado de Oliveira; Niinuma, K; Biland, A; Blanch, O; Bonnoli, G; Bosnjak, Z; Busetto, G; Hoang, J; Carosi, R; Ceribella, G; Cerruti, M; Chai, Y; Maggio, C; Chilingarian, A; Cikota, S; Colak, S M; Colombo, E; Contreras, J L; Hrupec, D; Cortina, J; Covino, S; D’Amico, G; D’Elia, V; Da Vela, P; Majumdar, P; Dazzi, F; De Angelis, A; De Lotto, B; Delfino, M; Hütten, M; Delgado, J; Mendez, C Delgado; Depaoli, D; Pierro, F Di; Venere, L Di; Espiñeira, E Do Souto; Makariev, M; Prester, D Dominis; Donini, A; Dorner, D; Inada, T; Doro, M; Elsaesser, D; Ramazani, V Fallah; Fattorini, A; Ferrara, G; Fonseca, M V; Font, L; Mallamaci, M; Fruck, C; Fukami, S; Manganaro, M; López, R J García; Garczarczyk, M; Gasparyan, S; Gaug, M; Giglietto, N; Giordano, F; Gliwny, P; Godinović, N; Maneva, G; Green, J G; Scherpenberg, J van; Inoue, S; Ishio, K; Iwamura, Y; Jiménez, I; Jormanainen, J; Jouvin, L; Kajiwara, Y; Karjalainen, M; Kerszberg, D; Kobayashi, Y; Vanzo, G; Mannheim, K; Kubo, H; Kushida, J; Lamastra, A; Lelas, D; Leone, F; Lindfors, E; Lombardi, S; Longo, F; López-Coto, R; Vazquez Acosta, M; López-Moya, M; Batkovic, I; Maraschi, L; Mariotti, M; Martínez, M; Mazin, D; Menchiari, S; Mender, S; Mićanović, S; Miceli, D; Ventura, S; Miener, T; Minev, M; Gonzalez, J Becerra; Miranda, J M; Mirzoyan, R; Molina, E; Moralejo, A; Morcuende, D; Moreno, V; Moretti, E; Verguilo, V; Neustroev, V; Nigro, C; Nilsson, K; Bednarek, W; Nishijima, K; Noda, K; Nozaki, S; Ohtani, Y; Oka, T; Otero-Santos, J; Vigorito, C F; Paiano, S; Palatiello, M; Paneque, D; Paoletti, R; Bellizzi, L; Paredes, J M; Pavletić, L; Peñil, P; Perennes, C; Persic, M; Vitale, V; Moroni, P G Prada; Prandini, E; Priyadarshi, C; Puljak, I; Rhode, W; Bernardini, E; Ribó, M; Rico, J; Righi, C; Rugliancich, A; Vovk, I; Saha, L (Oxford University Press on behalf of Royal Astronomical Society, 2022-02)
    We report multiwavelength observations of the gravitationally lensed blazar QSO B0218+357 in 2016–2020. Optical, X-ray, and GeV flares were detected. The contemporaneous MAGIC observations do not show significant very high ...
  • Rajput, Bhoomika; Stalin, C. S; Sahayanathan, S; Rakshit, S; Amit Kumar Mandal (Oxford University Press on behalf of the Royal Astronomical Society, 2019-06)
    Blazars show optical and γ-ray flux variations that are generally correlated, although there are exceptions. Here we present anomalous behaviour seen in the blazar 3C 454.3 based on an analysis of quasi-simultaneous data ...
  • Subramanian, P; Shukla, A; Becker, P. A (Wiley-Blackwell, 2012-06)
    Recently observed minute-time-scale variability of blazar emission at TeV energies has imposed severe constraints on jet models and TeV emission mechanisms. We focus on a robust jet instability to explain this variability. ...
  • Paliya, Vaidehi S; Saikia, D. J; Stalin, C. S (Oxford University Press on behalf of Royal Astronomical Society, 2023-03)
    The orientation of the jet axis to the line of sight of the observer plays a major role in explaining the phenomena observed from blazars and radio galaxies. In the γ -ray band, only a handful of radio galaxies have been ...
  • Bhattacharya, Debbijoy; Mohana A, K; Gulati, S; Bhattacharyya, Subir; Bhatt, N; Sreekumar, P; Stalin, C. S (Oxford University Press on behalf of the Royal Astronomical Society, 2017-11)
    We examine the long-term (∼10 years) γ-ray variability of blazars observed by the Energetic Gamma Ray Experiment Telescope (EGRET) and Fermi and find that 10 EGRET-detected flat-spectrum radio quasars (FSRQs) were not ...

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