ARIES-Institutional Digital Repository

Browsing by Subject "BL Lacertae objects: general"

Browsing by Subject "BL Lacertae objects: general"

Sort by: Order: Results:

  • Characterizing Optical Variability of OJ 287 in 2016–2017 
    Gupta, Alok C. et al.; Gaur, Haritma; Pandey, A. (The Astronomical Journal, 2019-03)
    We report on a recent multiband optical photometric and polarimetric observational campaign of the blazar OJ 287 that was carried out during 2016 September–2017 December. We employed nine telescopes in Bulgaria, China, ...
  • Extreme photometric and polarimetric variability of blazar S4 0954+65 at its maximum optical and γ -ray brightness levels 
    Raiteri, C. M. , et.al.; Gaur, H.; Gupta, A. C.; Kishore, S.; Wani, K. (Monthly Notices of the Royal Astronomical Society, 2023-12)
    In 2022 the BL Lac object S4 0954+65 underwent a major variability phase, reaching its historical maximum brightness in the optical and γ -ray bands. We present optical photometric and polarimetric data acquired by the ...
  • Intra-night optical flux and polarization variability of BL Lacertae during its 2020–2021 high state 
    Bachev, Rumen; Tripathi, Tushar; Gupta, Alok C.; Kishore, Shubham; Gaur, Haritma; Dhiman, Vinit (Monthly Notices of the Royal Astronomical Society, 2023-06)
    In this work, we report the presence of rapid intra-night optical variations in both flux and polarization of the blazar BL Lacertae during its unprecedented 2020–2021 high state of brightness. The object showed significant ...
  • Intranight optical variability of blazars and radio-quiet quasars using the ZTF survey 
    Negi, Vibhore; Krishna, Gopal; Joshi, Ravi; Chand, Hum; Wiita, Paul J.; Navaneeth, P. K.; Singh, Ravi S. (Monthly Notices of the Royal Astronomical Society, 2023-07)
    We explore the potential of the ongoing Zwicky Transient Facility (ZTF) survey for studying intranight optical variability (INOV) of active galactic nuclei (AGNs), in particular for picking rare events of large INOV ...
  • Intranight optical variability of TeV blazars with parsec-scale jets dominated by slow-moving radio knots 
    Negi, Vibhore; Krishna, Gopal; Chand, Hum; Britzen, Silke (Monthly Notices of the Royal Astronomical Society, 2023-09)
    BL Lac objects detected at TeV energies preferentially belong to the subclass called ‘high-frequency-peaked’ BL Lacs (HBLs). Parsec-scale radio jetsin these TeV-HBLs often show dominant,slow-moving radio knotsthat are at ...
  • Investigating the origin of optical flares from the TeV blazar S4 0954+65 
    Pandey, Ashwani; Bachev, Rumen; Czerny, Bo˙zena; Wiita, Paul J.; Gupta, Alok C.; Strigachev, Anton; Popowicz, Adam (Astronomy & astrophysics, 2023-11)
    Aims. We aim to investigate the extreme variability properties of the TeV blazar S4 0954+65 using optical photometric and polarisation observations carried out between 2017 and 2023 using three ground-based telescopes. Methods. ...
  • Multiband optical variability of a newly discovered 12 blazars sample from 2013 – 2019 
    Jovanovic, Miljana D.; Damljanovic, Goran; Taris, Francois; Gupta, Alok C.; Bhatta, Gopal (Monthly Notices of the Royal Astronomical Society, 2023-06)
    Here we present the first optical photometric monitoring results of a sample of 12 newly discovered blazars from the ICRF – Gaia CRF astrometric link. The observations were performed from April 2013 to August 2019 using ...
  • Multiband optical variability of the TeV blazar PG 1553 + 113 in 2019 
    Dhiman, Vinit; Gupta, Alok C. ,et.al.; Gaur, Haritma (Monthly Notices of the Royal Astronomical Society, 2023-02)
    We report the flux and spectral variability of PG 1553 + 113 on intra-night (IDV) to short-term time-scales using BVRI data collected over 91 nights from 28 February to 8 November 2019 employing 10 optical telescopes: ...
  • Multiband optical variability on diverse time-scales of the TeV blazar TXS 0506 + 056, the first cosmic neutrino source 
    Dhiman, Vinit; Gupta, Alok C.; Bachev, Rumen; Wiita, Paul J.; Cellone, Sergio A.; Strigachev, A.; Gaur, Haritma; Darriba, A.; Bisen, D. P.; Locatelli, G.; Mammana, L. A.; Semkov, E. (Monthly Notices of the Royal Astronomical Society, 2024-01)
    We report the first extensive optical flux and spectral variability study of the TeV blazar TXS 0506 + 056 on intranight to long-term time-scales using BVRI data collected over 220 nights between 2017 January 21 to 2022 ...
  • The optical behaviour of BL Lacertae at its maximum brightness levels: a blend of geometry and energetics 
    Raiteri, C. M. , et.al.; Dhiman, V.; Gaur, H.; Gupta, A. C.; Kushwaha, P.; Tripathi, T. (Monthly Notices of the Royal Astronomical Society, 2023-06)
    In 2021 BL Lacertae underwent an extraordinary activity phase, which was intensively followed by the Whole Earth Blazar Telescope (WEBT) Collaboration. We present the WEBT optical data in the BVRI bands acquired at 36 ...
  • Optical Flux and Spectral Variability of the TeV Blazar PG 1553+113 
    Pandey, Ashwani; Gupta, Alok C.; Wiita, Paul J.; Tiwari, S. N. (The Astrophysical Journal, 2019-02)
    We present the results of our optical (VRI) observations of the TeV blazar PG 1553+113 over eight nights in 2016 April. We monitored the blazar quasi-simultaneously in V and R bands each night and examined the light ...
  • Optical intraday variability of the blazar S5 0716+714 
    Tripathi, Tushar; Gupta, Alok C.; Takey, Ali; Bachev, Rumen; Vince, Oliver; Strigachev, Anton; Kushwaha, Pankaj; Elhosseiny, E. G.; Wiita, Paul J.; Damljanovic, G.; Dhiman, Vinit; Fouad, A.; Gaur, Haritma; Gu, Minfeng; Hamed, G. E.; Kishore, Shubham; Kurtenkov, A.; Rastogi, Shantanu; Semkov, E.; Zead, I.; Zhang, Zhongli (Monthly Notices of the Royal Astronomical Society, 2024-01)
    We present an extensive recent multiband optical photometric observations of the blazar S5 0716+714 carried out over 53 nights with two telescopes in India, two in Bulgaria, one in Serbia, and one in Egypt during 2019 ...
  • X-ray intraday variability of the TeV blazar Mrk 421 with Chandra. 
    Aggrawal, Vishi et al.; Pandey, Ashwani; Gupta, Alok C. (Monthly notices of the Royal Astronomical society, 2018-11)
    We present an extensive study of 72 archival Chandra light curves of the high-frequencypeaked type blazar Mrk 421, the first strong extragalactic object to be detected at TeV energies. Between 2000 and 2015, Mrk 421 often ...

Search ARIES-IDR

Browse

My Account