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Browsing by Author "Chand, Krishan"

Browsing by Author "Chand, Krishan"

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  • Intranight optical variability of low-mass active galactic nuclei: a pointer to blazar-like activity 
    Krishna, Gopal, et.al.; Chand, Krishan (Monthly Notices of the Royal Astronomical Society Letters, 2023-01)
    This study aims to characterize, for the first time, intranight optical variability (INOV) of low-mass active galactic nuclei (LMAGNs) which host a black hole (BH) of mass MBH ∼ 106M , i.e. even less massive than the ...
  • Persistence of the blazar state in flat-spectrum radio quasars 
    Chand, Krishan; Krishna, Gopal (Monthly Notices of the Royal Astronomical Society Letters, 2022-10)
    Flat-spectrum radio quasars (FSRQs), whose brightness is dominated by a relativistically beamed core, are frequently found in the ‘blazar state’ commonly inferred from a high optical polarization (> 3 per cent) and/or a ...
  • Pluto’s Atmosphere in Plateau Phase Since 2015 from a Stellar Occultation at Devasthal 
    Sicardy, Bruno,et.al.; Sharma, Saurabh; Chand, Krishan (Astrophysical Journal Letters, 2021-12)
    A stellar occultation by Pluto was observed on 2020 June 6 with the 1.3 m and 3.6 m telescopes located at Devasthal, Nainital, India, using imaging systems in the I and H bands, respectively. From this event, we derive ...
  • 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 ...
  • TRANSITIONS AND PERSISTENCE OF BLAZAR STATE IN BEAMED RADIO QUASARS 
    Chand, Krishan (ARIES, Nainital, 2022-12)
    A compact region at the centre of a galaxy known as an active galactic nucleus (AGN) generates a significant amount of energy that is not directly due to stars. It is believed that the accretion of materials onto ...

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