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Browsing by Author "Paliya, Vaidehi S"

Browsing by Author "Paliya, Vaidehi S"

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  • Awakening of the high-redshift blazar CGRaBS J0809+5341 
    Paliya, Vaidehi S; Parker, M. L; Stalin, C. S; Fabian, A. C; Ramya, S; Covino, S; Tagliaferri, G; Sahayanathan, S; Ravikumar, C. D (IOP Publishing, 2015-04)
    CGRaBS J0809+5341, a high-redshift blazar at z = 2.144, underwent a giant optical outburst on 2014 April 19 when it brightened by ~5 mag and reached an unfiltered apparent magnitude of 15.7 mag. This implies an absolute ...
  • Broadband observations of high redshift blazars 
    Paliya, Vaidehi S; Parker, M. L; Fabian, A. C; Stalin, C. S (IOP Publishing, 2016-07-01)
    We present a multi-wavelength study of four high redshift blazars, S5 0014+81 (z = 3.37), CGRaBS J0225+1846 (z = 2.69), BZQ J1430+4205 (z = 4.72), and 3FGL J1656.2−3303 (z = 2.40) using quasi-simultaneous data from the ...
  • Broadband observations of the gamma-ray emitting narrow line Seyfert 1 galaxy SBS 0846+513 
    Paliya, Vaidehi S; Rajput, Bhoomika; Stalin, C. S; Pandey, S. B (IOP Publishing, 2016-03)
    We present the results of our broadband study of the γ -ray emitting narrow line Seyfert 1 ( NLSy1 ) galaxy SBS 0846 + 513 ( z = 0.585 ) . This includes multiband fl ux variations, γ -ray spectral analysis, ...
  • DA 362: a gamma-ray-emitting compact symmetric object 
    Swain, Subhashree; Paliya, Vaidehi S; Saikia, D. J; Stalin, C. S (American Astronomical Society, 2025-02-01)
    The γ-ray detection from an astrophysical object indicates the presence of an extreme environment where highenergy radiation is produced. With the continuous monitoring of the γ-ray sky by the Fermi Large Area Telescope ...
  • The detection of teraelectronvolt radiation from a flat-spectrum radio quasar 
    Paliya, Vaidehi S; Bottcher, M; Wani, Kiran; Naseef Mohammed, P. N; Stalin, C. S; Sahayanathan, S; Saikia, D. J; Muneer, S (American Astronomical Society, 2025-09-20)
    The very high-energy (VHE; >100 GeV) radiation carries the signatures of the matter–energy interaction in some of the most extreme astrophysical environments. Considering broad emission line blazars, i.e., flat-spectrum ...
  • Evidence for Low-power Radio Jet–ISM Interaction at 10 pc in the Dwarf AGN Host NGC 4395 
    Nandi, Payel; Stalin, C. S; Saikia, D. J; Riffel, Rogemar A; Manna, Arijit; Pal, Sabyasachi; Dors, O. L; Wylezalek, Dominika; Paliya, Vaidehi S; Saikia, Payaswini; Dabhade, Pratik; Patig, Markus-Kissler; Sagar, R (American Astronomical Society, 2023-12-20)
    Black-hole-driven outflows in galaxies hosting active galactic nuclei (AGN) may interact with their interstellar medium (ISM) affecting star formation (SF). Such feedback processes, reminiscent of those seen in ...
  • Fermi monitoring of radio-loud narrow-line seyfert 1 galaxies 
    Paliya, Vaidehi S; Stalin, C. S; Ravikumar, C. D (IOP Publishing, 2015-02)
    We present detailed analysis of the γ-ray flux variability and spectral properties of the five radio-loud narrow line Seyfert 1 (RL-NLSy1) galaxies, detected by the Large Area Telescope on board the Fermi Gamma-Ray Space ...
  • Fermi-large area telescope detection of very high energy (>100 GeV) emission from misaligned jetted active galactic nuclei 
    Tomar, Gunjan; Paliya, Vaidehi S; Saikia, D. J; Stalin, C. S (Elsevier B.V, 2026-01)
    The detection of very-high-energy (VHE; >100 GeV) 𝛾-ray radiation from misaligned jetted Active Galactic Nuclei (AGN) challenges the emission models that primarily explain VHE emissions from beamed AGN, i.e., blazars. ...
  • The first GeV outburst of the radio-loud narrow-line Seyfert 1 galaxy PKS 1502+036 
    Paliya, Vaidehi S; Stalin, C. S (IOP Publishing, 2016-03)
    The γ-ray-loud narrow-line Seyfert 1 (γ-NLSy1) galaxy PKS 1502+036 (z = 0.409) exhibited its first γ-ray outburst on 2015 December 20. In the energy range of 0.1–300 GeV, the highest flux measured by the Fermi-Large Area ...
  • Flux and polarization variability of OJ 287 during the early 2016 outburst 
    Rakshit, S; Stalin, C. S; Muneer, S; Neha, S; Paliya, Vaidehi S (IOP Publishing, 2017-02-01)
    The gamma-ray blazar OJ 287 was in a high activity state during 2015 December–2016 February. Coinciding with this high brightness state, we observed this source for photometry on 40 nights in R-band and for polarimetry on ...
  • Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies in the Sloan Digital Sky Survey 
    Paliya, Vaidehi S; Ajello, M; Rakshit, S; Amit Kumar; Stalin, C. S; Kaur, A; Hartmann, D (IOP Publishing, 2018-01)
    The detection of signi fi cant γ -ray emission from radio-loud narrow-line Seyfert 1 ( NLSy1s ) galaxies enables us to study jets in environments different than those in blazars. However, due to the small number ...
  • General physical characteristics of Gamma-ray emitting beamed AGNs in fermi era. 
    Paliya, Vaidehi S (Indian Institute of Astrophysics, 2016-08)
    The research work presented in this thesis is aimed to provide a detailed under- standing of the radiative processes powering the jets of the blazars, a class of AGNs with jet pointed towards the line of sight to the ...
  • A Hard gamma-ray flare from 3C 279 in 2013 December 
    Paliya, Vaidehi S; Diltz, Chris; Bottcher, Markus; Stalin, C. S; Buckley, David (IOP Publishing, 2016-01)
    The blazar 3C 279 exhibited twin γ -ray fl ares of similar intensity in 2013 December and 2014 April. In this work, we present a detailed multi-wavelength analysis of the 2013 December fl aring event. Multi-frequency ...
  • The high-redshift blazar S5 0836+71: a broadband study 
    Paliya, Vaidehi S (IOP Publishing, 2015-05-01)
    A broadband study of the high-redshift blazar S5 0836+71 (z = 2.172) is presented. Multi-frequency light curves show multiple episodes of X-ray and γ-ray flares, while optical-UV fluxes show little variations. During the ...
  • Identification of large-scale (>100 kpc) radio jets in narrow-line seyfert 1 galaxies 
    Umayal, S; Paliya, Vaidehi S; Saikia, D. J; Stalin, C. S; Muneer, S; Maheswar, G (American Astronomical Society, 2025-12-10)
    Powerful, large-scale relativistic jets are usually associated with massive, old elliptical galaxies. This paradigm has recently been challenged by the identification of narrow-line Seyfert 1 (NLSy1) galaxies, thought to ...
  • Intra-night optical variability characteristics of different classes of narrow-line seyfert 1 galaxies 
    Kshama, S. K; Paliya, Vaidehi S; Stalin, C. S (Oxford University Press on behalf of the Royal Astronomical Society, 2017-04)
    In a first systematic effort to characterize the intra-night optical variability (INOV) of different classes of narrow-line Seyfert 1 (NLSy1) Galaxies, we have carried out observations on a sample of radio-loud (RL) and ...
  • Intra-night Optical Variability Monitoring of Fermi Blazars: First Results from 1.3 m J. C. Bhattacharya Telescope 
    Paliya, Vaidehi S; Stalin, C. S; Ajello, M; Kaur, A (IOP Publishing, 2017-08)
    We report the first results obtained from our campaign to characterize the intra-night-optical variability (INOV) properties of Fermi detected blazars, using the observations from the recently commissioned 1.3 m J. ...
  • Intranight optical variability of γ -ray-loud narrow-line Seyfert 1 galaxies 
    Paliya, Vaidehi S; Stalin, C. S; Kumar, Brijesh; Kumar, Brajesh; Bhatt, V. K; Pandey, S. B; Yadav, K. S (Oxford University Press on behalf of the Royal Astronomical Society, 2013-01-21)
    The Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope has detected γ-ray emission in about half a dozen narrow-line Seyfert 1 (NLSy1) galaxies. This indicates the presence of relativistic jets in these ...
  • Leptonic and hadronic modeling of Fermi-LAT hard spectrum quasars and predictions for high-energy polarization 
    Paliya, Vaidehi S; Zhang, H; Bottcher, M; Ajello, M; Domi­nguez, A; Joshi, M; Hartmann, D; Stalin, C. S (IOP Publishing, 2018-08)
    We present the results of a study of the time-averaged spectral energy distributions (SEDs) of eight flat spectrum radio quasars (FSRQs) present in the second catalog of high energy sources detected beyond 50 GeV by the ...
  • Lepto−Hadronic Origin of γ-ray Outbursts of 3C 279 
    Paliya, Vaidehi S; Diltz, C; Bottcher, M; Stalin, C. S; Buckley, D (Astronomical Society of India, 2015-03)
    The blazar 3C 279 exhibited a giant γ-ray outburst in 2013 December and 2014 April. Apart from the very fast γ-ray flux variability, the spectral nature of the flares were also found to vary significantly between these ...

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