ARIES-Institutional Digital Repository

Browsing by Author "Chand, Hum"

Browsing by Author "Chand, Hum"

Sort by: Order: Results:

  • Evidence of jet-induced optical microvariability in radio-loud narrow-line Seyfert 1 galaxies 
    Ojha, Vineet; Jha, Vivek Kumar; Chand, Hum; Singh, Veeresh (Monthly Notices of the Royal Astronomical Society, 2022-08)
    To quantify the role of radio jets for Intra-Night Optical Variability (INOV) in radio-loud narrow-line Seyfert 1 (RLNLSy1) galaxies, we report the first systematic comparative INOV study of 23 RLNLSy1 galaxies, with 15 ...
  • Intra-night optical monitoring of three γ -ray detected narrow-line Seyfert 1 galaxies 
    Ojha, Vineet; Krishna, Gopal-; Chand, Hum (Monthly notices of the Royal Astronomical Society, 2019-03)
    For three radio-loud γ -ray detected narrow-line Seyfert 1 (γ -ray NLSy1) galaxies, we report optical variability on intra-night and/or week-like time-scales, based on five ≥ 3 h long monitoring sessions for each galaxy. ...
  • 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 ...
  • Probable low-frequency quasi-periodic oscillations in blazars from the ZTF survey 
    Banerjee, Anuvab; Negi, Vibhore; Joshi, Ravi; Kumar, Nagendra; Wiita, Paul J.; Chand, Hum; Rawat, Nikita; Wu, Xue-Bing; Ho, Luis C. (Monthly Notices of the Royal Astronomical Society, 2023-12)
    We investigate the possible presence of quasi-periodic oscillation (QPO) signals in 2103 blazars from the Zwicky Transient Facility (ZTF) time-domain survey. We detect a low-frequency QPO signal in five blazars observed ...
  • The transience and persistence of high optical polarisation state in beamed radio quasars 
    Chand, Krishan; Krishna, Gopal; Omar, Amitesh; Chand, Hum; Bisht, P. S. (Publications of the Astronomical Society of Australia, 2023-02)
    We examine the long-term stability (on decade-like timescales) of optical ‘high polarisation’ (HP) state with popt > 3%, which commonly occurs in flat-spectrum (i.e., beamed) radio quasars (FSRQs) and is a prominent marker ...

Search ARIES-IDR

Browse

My Account