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Browsing by Author "Pandey, Ashwani"

Browsing by Author "Pandey, Ashwani"

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  • 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. ...
  • Multiwavelength studies of TeV blazars 
    Pandey, Ashwani (ARIES, Nainital, 2020)
    Blazars, comprising BL Lacertae objects (BL Lacs; featureless optical spectra) and flat-spectrum radio quasars (FSRQs; strong broad emission lines in optical spectra), are the active galactic nuclei (AGNs) with strong ...
  • 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 ...
  • 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 ...

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