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Browsing by Author "Rani, B."

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Nearly periodic fluctuations in the long-term x-ray light curves of the blazars AO 0235+164 and 1ES 2321+419

Rani, B.; Wiita, P. J.; Gupta, A. C. (2009-05-10)

We have performed a structure function analysis of the Rossi X-Ray Timing Explorer All-Sky Monitor data to search for variability in 24 blazars using data trains that each exceed 12 yr. Although 20 of them show nominal periods ...
Network loop oscillations with EIS/Hinode

Srivastava, A. K.; Kuridze, D.; Zaqarashvili, T. V.; Dwivedi, B. N.; Rani, B. (2010)

We analyze a time sequence of He II 256.32 Å images obtained with EIS/Hinode, sampling a small magnetic loop in magnetic network. Wavelet analysis indicates 11-min periodicity close to the loop apex. We interpret this ...
Optical intra-day variability timescales and black hole mass of the blazars

Gupta, S. P.; Pandey, U. S.; Singh, K.; Rani, B.; Pan, J.; Fan, J. H.; Gupta, A. C. (2011)

In this paper, we have used optical intra-day variability archive data to calculate the central black hole masses and Eddington luminosities for nine blazars: 3C 66A, AO 0235+164, S5 0716+714, PKS 0735+178, OJ 287, 1215+303, ...
Optical intraday variability studies of 10 low energy peaked blazars

Rani, B.; Gupta, A. C.; Joshi, U. C.; Ganesh, S.; Wiita, P. J. (2011)

We have carried out optical (R band) intraday variability (IDV) monitoring of a sample of 10 bright low energy peaked blazars (LBLs). 40 photometric observations, of an average of ∼4 h each, were made between 2008 September ...
Quasi-periodic oscillations of ~15 minutes in the optical light curve of the BL Lac S5 0716+714

Rani, B.; Gupta, A. C.; Joshi, U. C.; Ganesh, S.; Wiita, P. J. (2010)

Over the course of 3 hr on 2008 December 27, we obtained optical (R band) observations of the blazar S5 0716+714 at a very fast cadence of 10 s. Using several different techniques, we find fluctuations with an approximately ...
Spectral energy distribution variation in BL Lacs and flat spectrum radio quasars

Rani, B.; Gupta, A. C. (Wiley Online, 2011-11-01)

We present the results of our study of spectral energy distributions (SEDs) of a sample of 10 low- to intermediate-synchrotron-peaked blazars. We investigate some of the physical parameters most likely responsible for ...
Variability of spectral snergy distribution of Blazar S5 0716+714

Rani, B.; Gupta, A. C.; Wiita, P. J. (2011)

The emission from blazars is known to be variable at all wavelengths.The flux variability is often accompanied by spectral changes. Spectral energy distribution (SED) changes must be associated with changes in the spectra ...

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