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Browsing by Author "Gaur, H."

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A ∼4.6 h quasi-periodic oscillation in the BL Lacertae PKS 2155-304?

Lachowicz, P.; Gupta, A. C.; Gaur, H.; Wiita, P. J. (2009)

We report a possible detection of an ̴4.6-h quasi-periodic oscillation (QPO) in the 0.3–10 keV emission of the high-energy peaked blazar PKS 2155−304 from a 64 ks observation by the XMM-Newton EPIC/pn detector. We identify ...
Detection of intre-day variability timescales of four high-energy peaked blazars with XMM- newton

Gaur, H.; Gupta, A. C.; Lachowicz, P.; Wiita, P. J. (2010)

We selected a sample of 24 XMM–Newton light curves (LCs) of four high energy peaked blazars, PKS 0548−322, ON 231, 1ES 1426+428, and PKS 2155−304. These data comprise continuous LCs of 7.67–18.97 hr in length. We searched ...
Extreme photometric and polarimetric variability of blazar S4 0954+65 at its maximum optical and γ -ray brightness levels

Raiteri, C. M. , et.al.; Gaur, H.; Gupta, A. C.; Kishore, S.; Wani, K. (Monthly Notices of the Royal Astronomical Society, 2023-12)

In 2022 the BL Lac object S4 0954+65 underwent a major variability phase, reaching its historical maximum brightness in the optical and γ -ray bands. We present optical photometric and polarimetric data acquired by the ...
Multiwavelength intraday variability of the BL Lacertae S5 0716+714

Gupta, A. C. et. al.; Gaur, H. (2012)

We report results from a one-week multiwavelength campaign to monitor the BL Lacertae object (BL Lac) S5 0716+714 (on 2009 December 9–16). Nine ground-based telescopes at widely separated longitudes and one space-based ...
The nature of the intra-night optical variability in blazars

Bachev, R.; Semkov, E.; Strigachev, A.; Gupta, A. C.; Gaur, H.; Mihov, B.; Boeva, S.; Slavcheva-Mihova, L. (2012)

In this paper we present the results of a short-term optical monitoring program of 13 blazars. The objects were monitored mostly in the R band for a total of ∼160 h between 2006 and 2011. We study the nature of the ...
The optical behaviour of BL Lacertae at its maximum brightness levels: a blend of geometry and energetics

Raiteri, C. M. , et.al.; Dhiman, V.; Gaur, H.; Gupta, A. C.; Kushwaha, P.; Tripathi, T. (Monthly Notices of the Royal Astronomical Society, 2023-06)

In 2021 BL Lacertae underwent an extraordinary activity phase, which was intensively followed by the Whole Earth Blazar Telescope (WEBT) Collaboration. We present the WEBT optical data in the BVRI bands acquired at 36 ...
Optical Spectral Variability of Blazars

Gaur, H. (Indian Academy of Sciences, 2014-09)

It is well established that blazars show flux variations in the complete electromagnetic (EM) spectrum on all possible time scales rang- ing from a few tens of minutes to several years. Here, we report the review of ...

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