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20042025
most citedLimits on the time variation of the electromagnetic fine-structure constant in the low energy limit from absorption lines in the spectra of distant quasars

335 citations · 1.6k across the 54 of their papers we have counts for

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Showing 2014Show all

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astro-ph.HE2014★ 10 cited

Intranight Optical Variability of Radio-Quiet Weak Emission Line Quasars-II

Hum Chand, Parveen Kumar, Gopal-Krishna

This is continuation of our search for the elusive radio-quiet blazars, by carrying out a systematic programme to detect intranight optical variability (INOV) in a subset of `Weak-…

astro-ph.GA2014

C IV absorption line variability in X-ray bright BALQSOs

Ravi Joshi, Hum Chand, Raghunathan Srianand +1

We report kinematic shift and strength variability of C IV broad absorption line (BAL) trough in two high-ionization X-ray bright QSOs SDSS J085551+375752 (at zem ~ 1.936) and SDSS…