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THE PECULIAR RADIO-LOUD NARROW LINE SEYFERT 1 GALAXY 1H 0323+342

We present a multiwavelength study of the radio-loud narrow-line Seyfert 1 galaxy (NLSy1) 1H 0323+342, detected by the Fermi Gamma-Ray Space Telescope. Multiband light curves show many orphan X-ray…
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MULTI-WAVELENGTH OBSERVATIONS OF 3C 279 DURING THE EXTREMELY BRIGHT GAMMA-RAY FLARE IN 2014 MARCH–APRIL

The well-studied blazar 3C 279 underwent a giant γ-ray outburst in 2014 March–April. The measured γ-ray flux (1.21 ± 0.10 × 10−5 ph cm − 2 s − 1 ?> in a 0.1–300 GeV energy range) is the highest…
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THE VIOLENT HARD X-RAY VARIABILITY OF MRK 421 OBSERVED BY NuSTAR IN 2013 APRIL

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…
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General Physical Properties of CGRaBS Blazars

We present the results of a multi-frequency, time-averaged analysis of blazars included in the Candidate Gamma-ray Blazar Survey catalog. Our sample consists of 324 γ-ray detected (γ-ray loud) and…
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The TACTIC atmospheric Cherenkov Imaging telescope

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Study on temporal and spectral behaviour of 3C 279 during 2018 January flare

We present a detailed temporal and spectral study of the blazar 3C\,279 using multi-wavelength observations from Swift-XRT, Swift-UVOT and Fermi-LAT during a flare in 2018 January. The temporal…
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The flux distribution of individual blazars as a key to understand the dynamics of particle acceleration

The observed log-normal flux distributions in the high energy emission from blazars have been interpreted as being due to variability stemming from non-linear multiplicative processes generated…
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High energy emission processes in OJ 287 during 2009 flare

The broad-band spectrum of a BL Lac object, OJ 287, from radio to γ-rays obtained during a major γ-ray flare detected by Fermi in 2009 is studied to understand the high energy emission mechanism…
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Temporal correlation between the optical and γ-ray flux variations in the blazar 3C 454.3

Blazars show optical and γ-ray flux variations that are generally correlated, although there are exceptions. Here we present anomalous behaviour seen in the blazar 3C 454.3 based on an analysis of…
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A two-zone synchrotron model for the knots in the M87 jet

The flux and the spectral index in the X-ray energy band from the knots of the M87 jet as observed by Chandra indicate a possible synchrotron origin but cannot be explained by simple one-zone models…
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