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Browsing by Author "Paliya, Vaidehi S"

Browsing by Author "Paliya, Vaidehi S"

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  • Narrow-line Seyfert 1 galaxies in Sloan Digital Sky Survey: a new optical spectroscopic catalogue 
    Paliya, Vaidehi S; Stalin, C. S; Dominguez, Alberto; Saikia, D. J (Oxford University Press on behalf of Royal Astronomical Society, 2024-01)
    Narrow-line Seyfert 1 (NLSy1) galaxies are an enigmatic class of active galactic nuclei (AGN) that exhibit peculiar multiwavelength properties across the electromagnetic spectrum. For example, these sources have allowed ...
  • The Nature of γ -ray loud Narrow-line Seyfert I Galaxies PKS 1502+036 And PKS 2004-447 
    Paliya, Vaidehi S; Stalin, C. S; Shukla, A; Sahayanathan, S (IOP Publishing, 2013-05-01)
    Variable γ-ray emission has been discovered in five radio-loud narrow-line Seyfert 1 (NLSy1) galaxies by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. This has clearly demonstrated that these NLSy1 ...
  • NuSTAR, Swift, and GROND observations of the flaring MeV blazar PMN J0641-0320 
    Ajello, M; Ghisellini, G; Paliya, Vaidehi S; Kocevski, D; Tagliaferri, G; Madejski, G; Rau, A; Schady, P; Greiner, J; Massaro, F; Balokovic, M; Buhler, R; Giomi, M; Marcotulli, L; D'Ammando, F; Stern, D; Boggs, S. E; Christensen, F. E; Craig, W. W; Hailey, C. J; Harrison, F. A; Zhang, W. W (IOP Publishing, 2016-07-20)
    MeV blazars are a sub-population of the blazar family, exhibiting larger-than-average jet powers, accretion luminosities, and black hole masses. Because of their extremely hard X-ray continua, these objects are best studied ...
  • On the Origin of Gamma-Ray Flares from Bright Fermi Blazars 
    Paliya, Vaidehi S; Böttcher, M; Gurwell, Mark; Stalin, C. S (IOP Publishing, 2021-12)
    The origin of γ-ray flares observed from blazars is one of the major mysteries in jet physics. We have attempted to address this problem following a novel spectral energy distribution (SED) fitting technique that explored ...
  • The peculiar radio-loud narrow line seyfert 1 galaxy 1H 0323+342 
    Paliya, Vaidehi S; Sahayanathan, S; Parker, M. L; Fabian, A. C; Stalin, C. S; Anjum, A; Pandey, S. B (IOP Publishing, 2014-07-10)
    We present a multi-wavelength study of the radio-loud narrow line Seyfert 1 galaxy (NLSy1), 1H 0323+342, detected by Fermi Gamma Ray Space Telescope. Multi-band light curves show many orphan X-ray and optical flares having ...
  • TXS 1206 + 549: a new γ -ray-detected narrow-line Seyfert 1 galaxy at redshift 1.34? 
    Rakshit, S; Schramm, Malte; Stalin, C. S; Tanaka, I; Paliya, Vaidehi S; Pal, Indrani; Kotilainen, Jari; Shin, Jaejin (Oxford University Press on behalf of the Royal Astronomical Society, 2021-06)
    Radio and γ-ray loud narrow-line Seyfert 1 galaxies (NLS1s) are unique objects to study the formation and evolution of relativistic jets, as they are believed to have high accretion rates and powered by low mass black holes ...
  • TXS 1433+205: The most distant gamma-ray emitting FR II radio galaxy 
    Paliya, Vaidehi S; Saikia, D. J; Stalin, C. S (Oxford University Press on behalf of Royal Astronomical Society, 2023-03)
    The orientation of the jet axis to the line of sight of the observer plays a major role in explaining the phenomena observed from blazars and radio galaxies. In the γ -ray band, only a handful of radio galaxies have been ...
  • The violent hard X-ray variability of MRK 421 observed by Nustar in 2013 April 
    Paliya, Vaidehi S; Bottcher, M; Diltz, C; Stalin, C. S; Sahayanathan, S; Ravikumar, C. D (IOP Publishing, 2015-10-01)
    The well-studied blazar Markarian 421 (Mrk 421, z = 0.031) was the subject of an intensive multi-wavelength campaign when it flared in 2013 April. The recorded X-ray and very high-energy (E > 100 GeV) γ-ray fluxes are the ...

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