Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Chitnis, Varsha R."'
Autor:
Roy, Abhradeep, Gupta, Alok C., Chitnis, Varsha R., Cellone, Sergio A., Raiteri, Claudia M., Romero, Gustavo E., Wiita, Paul J., Chatterjee, Anshu, Combi, Jorge A., Liao, Mai, Sarkar, Arkadipta, Villata, Massimo
We present a long-term and intraday variability study on optical multiwaveband ($U\!BV\!RI$) data from the blazar AO 0235+164 collected by various telescopes for $\sim$44 years (1975--2019). The blazar was found to be significantly variable over the
Externí odkaz:
http://arxiv.org/abs/2301.01944
Autor:
Roy, Abhradeep, Chitnis, Varsha R., Gupta, Alok C., Wiita, Paul J., Romero, Gustavo E., Cellone, Sergio A., Chatterjee, Anshu, Combi, Jorge A., Raiteri, Claudia M., Sarkar, Arkadipta, Villata, Massimo
We present a long term optical $R$ band light curve analysis of the gravitationally lensed blazar AO 0235+164 in the time span 1982 - 2019. Several methods of analysis lead to the result that there is a periodicity of ~8.13 years present in these dat
Externí odkaz:
http://arxiv.org/abs/2205.03586
Autor:
Roy, Abhradeep, Sarkar, Arkadipta, Chatterjee, Anshu, Gupta, Alok C., Chitnis, Varsha R., Wiita, Paul J.
We present periodicity search analyses on the $\gamma$-ray lightcurve of the TeV blazar PKS 1510-089 observed by the \textit{Fermi} Large Area Telescope. We report the detection of two transient quasi-periodic oscillations: a 3.6-day QPO during the o
Externí odkaz:
http://arxiv.org/abs/2112.08955
We report on temporal and spectral study of a flat spectrum radio quasar, PKS B1222+216, in flare state to get insight into acceleration and emission mechanisms inside the jet. This is one of the brightest and highly active blazar in the MeV-GeV regi
Externí odkaz:
http://arxiv.org/abs/2105.10891
The regular monitoring of flat-spectrum radio quasars (FSRQs) in $\gamma$-rays by Fermi-LAT since past 12 years indicated six sources who exhibited extreme $\gamma$-ray outbursts crossing daily flux of $10^{-5}$ photons/cm$^{2}$/s. We obtained nearly
Externí odkaz:
http://arxiv.org/abs/2104.08566
Publikováno v:
A&A, 642 (2020) A129
Quasi-periodic fluctuations in the light curves of blazars can provide insight into the underlying emission process. This type of flux modulation hints at periodic physical processes that result in emission. CTA 102, a flat spectrum radio quasar at $
Externí odkaz:
http://arxiv.org/abs/2010.07136
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 501, Issue 1, February 2021, Pages 50-61
We report the detection ($>4\sigma$) of a Quasi-Periodic Oscillation (QPO) in the $\gamma$-ray light curve of 3C 454.3 along with a simultaneous marginal QPO detection ($>2.4\sigma$) in the optical light curves. Periodic flux modulations were detecte
Externí odkaz:
http://arxiv.org/abs/2003.01911
Publikováno v:
A&A 580, A100 (2015)
Context: In April 2013, the nearby (z=0.031) TeV blazar, Mkn 421, showed one of the largest flares in X-rays since the past decade. Aim: To study all multiwavelength data available during MJD 56392 to 56403, with special emphasis on X-ray data, and u
Externí odkaz:
http://arxiv.org/abs/1506.03629
Publikováno v:
2008, ChJAA, 8, 395-403
In the present paper, we have reported the result of simultaneous multi-wavelength observations of the TeV blazar Mrk 421 during February $-$ March 2003. In this period, we have observed Mrk 421 using Pachmarhi Array of \v{C}erenkov Telescopes (PACT)
Externí odkaz:
http://arxiv.org/abs/0801.1259
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