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Browsing by Subject "galaxies: nuclei"

Browsing by Subject "galaxies: nuclei"

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  • Accretion disc sizes from continuum reverberation mapping of AGN selected from the ZTF survey 
    Jha, Vivek Kumar; Joshi, Ravi,et.al. (Monthly Notices of the Royal Astronomical Society, 2022-04)
    We present the accretion disc-size estimates for a sample of 19 active galactic nuclei (AGNs) using the optical g-, r-, and i-band light curves obtained from the Zwicky Transient Facility survey. All the AGNs have reliable ...
  • A comparative study of the physical properties for a representative sample of Narrow and Broad-line Seyfert galaxies 
    Jha, Vivek Kumar; Chand, Hum; Ojha, Vineet; Omar, Amitesh; Rastogi, Shantanu (Monthly Notices of the Royal Astronomical Society, 2022-03)
    We present a comparative study of the physical properties of a homogeneous sample of 144 Narrow line Seyfert 1 (NLSy1) and 117 Broad-line Seyfert 1 (BLSy1) galaxies. These two samples are in a similar luminosity and ...
  • Host galaxy properties of quasi-periodically erupting X-ray sources 
    Wevers, T.; Pasham, D. R.; Jalan, P.; Rakshit, S.; Arcodia, R. (Astronomy & Astrophysics, 2022-03)
    Quasi-periodic X-ray eruptions (QPEs) are a recently discovered phenomenon, the nature of which remains unclear. Based on their discovery in active galactic nuclei (AGNs), explanations related to an AGN accretion disk or ...
  • Hunting extreme BL Lacertae blazars with Fermi-Large Area Telescope 
    Rosillo, M. Nievas,et.al.; Paliya, V. S. (Monthly Notices of the Royal Astronomical Society, 2022-05)
    The emission of very-high-energy (VHE) photons (E > 100 GeV) in blazars is closely connected to the production of ultra relativistic particles and the role of these γ -ray sources as cosmic particle accelerators. This work ...
  • LOFAR discovery of rare large FR I jets in the low-luminosity radio galaxy NGC 5322 
    Omar, Amitesh (Monthly Notices of the Royal Astronomical Society Letters, 2022-11)
    The discovery of faint Fanaroff–Riley type I (FR I) radio jets in the elliptical galaxy NGC 5322 is reported here using the 144-MHz image from Data Release 2 of the Low-Frequency Array (LOFAR) Two-metre Sky Survey (LoTSS). ...
  • 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 ...
  • 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 ...

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