Browsing Aryabhatta Research Institute of Observational Sciences by Author "Fan, J. H."

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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, ...
Two types of softening detected in x-ray afterglows of Swift bursts: internal and external shock origins?

Qin, Y-P; Gupta, A. C.; Fan, J. H.; Lu, R-J (2008)

The softening process observed in the steep decay phase of early x-ray afterglows of Swift bursts has remained a puzzle since its discovery. The softening process can also be observed in the later phase of the bursts and ...

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