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Browsing Aryabhatta Research Institute of Observational Sciences by Subject "Active galactic nuclei"

Browsing Aryabhatta Research Institute of Observational Sciences by Subject "Active galactic nuclei"

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  • Detection of Quasiperiodic Oscillations in the Blazar S4 0954+658 with TESS 
    Kishore, Shubham; Gupta, Alok C.; Wiita, Paul J. (The Astrophysical Journal, 2023-01)
    We report the detection of several quasiperiodicities around 0.6–2.5 days in the optical emission of the blazar S4 0954+658. The source was observed by the Transiting Exoplanet Survey Satellite in six sectors and it ...
  • Exploring γ-Ray Flares in the Long-term Light Curves of CTA 102 at GeV Energies 
    Geng, Xiongfei; Kushwaha, Pankaj (The Astrophysical Journal Supplement Series, 2022-06)
    Blazar CTA 102 experienced an intense multiwavelength activity phase from 2015 to 2018; in particular, an unprecedented outburst was observed from 2016 October to 2017 February. In this work, we extract a 7 day binned γ-ray ...
  • Gamma Rays from Fast Black-hole Winds 
    Ajello, M. ,et.al.; Paliya, V. (The Astrophysical Journal, 2021-11)
    Massive black holes at the centers of galaxies can launch powerful wide-angle winds that, if sustained over time, can unbind the gas from the stellar bulges of galaxies. These winds may be responsible for the observed ...
  • Multiwavelength Temporal Variability of the Blazar PKS 1510–089 
    Yuan, Q.; Kushwaha, Pankaj; Gupta, Alok C.; Tripathi, Ashutosh; Wiita, Paul J.; Zhang, M.; Liu, X.; Lähteenmäki, Anne; Tornikoski, Merja; Tammi, Joni; Ramakrishnan, Venkatessh; Cui, L.; Wang, X.; Gu, M. F.; Bambi, Cosimo; Volvach, A. E. (The Astrophysical Journal, 2023-08)
    We perform correlation and periodicity search analyses on long-term multiband light curves of the flat-spectrum radio quasar PKS 1510−089 observed by the space-based Fermi-Large Area Telescope in γ-rays, the SMARTS and ...
  • Optical Flux and Spectral Variability of BL Lacertae during Its Historical High Outburst in 2020 
    Kalita, Nibedita, et.al.; Gupta, Alok C. (The Astrophysical Journal, 2023-02)
    BL Lacertae underwent a series of historical high flux activity over a year from 2020 August in the optical to VHE γ-rays. In this paper, we report on optical flux and spectral variability of the first historical maxima ...
  • Quasi-simultaneous Optical Flux and Polarization Variability of the Binary Super Massive Black Hole Blazar OJ 287 from 2015 to 2023: Detection of an Anticorrelation in Flux and Polarization Variability 
    Gupta, Alok C.; Kushwaha, Pankaj; Valtonen, Mauri J.; Savchenko, Sergey S.; Jorstad, Svetlana G.; Imazawa, Ryo; Wiita, Paul J.; Gu, Minfeng; Marscher, Alan P.; Zhang, Zhongli; Bachev, Rumen; Borman, G. A.; Gaur, Haritma; Grishina, T. S.; Hagen-Thorn, V. A.; Kopatskaya, E. N.; Larionov, V. M.; Larionova, E. G.; Larionova, L. V.; Morozova, D. A.; Nakaoka, T; Strigachev, A; Troitskaya, Yulia V.; Troitsky, I. S.; Uemura, M.; Vasilyev, A. A.; Weaver, Z. R.; Zhovtan, A. V. (Astrophysical Journal Letters, 2023-11)
    We study the optical flux and polarization variability of the binary black hole blazar OJ 287 using quasi simultaneous observations from 2015 to 2023 carried out using telescopes in the USA, Japan, Russia, Crimea, ...
  • Rapid Optical Flares in the Blazar OJ 287 on Intraday Timescales with TESS 
    Kishore, Shubham; Gupta, Alok C.; Wiita, Paul J. (The Astrophysical Journal, 2024-01)
    We have analyzed the optical light curves of the blazar OJ 287 obtained with the Transiting Exoplanet Survey Satellite over about 80 days from 2021 October 13 to December 31, with an unprecedented sampling of 2 ...
  • The Seoul National University AGN Monitoring Project. IV. Hα Reverberation Mapping of Six AGNs and the Hα Size–Luminosity Relation 
    Cho, Hojin ,et.al.; Rakshit, Suvendu (2023-08)
    The broad-line region (BLR) size–luminosity relation has paramount importance for estimating the mass of black holes in active galactic nuclei (AGNs). Traditionally, the size of the Hβ BLR is often estimated from the ...
  • X-Ray Intraday Variability of the TeV Blazar Markarian 421 with XMM-Newton 
    Noel, A Priyana, et.al.; Gaur, Haritma; Gupta, Alok C.; Dhiman, Vinit (The Astrophysical Journal Supplement Series, 2022-09)
    Highly variable Markarian 421 is a bright high–synchrotron energy peaked blazar showing a wide featureless nonthermal spectrum, making it a good candidate for our study of intraday flux and spectral variations over time. We ...

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