Journal Article

Probing spectral properties of radio-quiet quasars searched for optical microvariability

Hum Chand, Paul J. Wiita and Alok C. Gupta

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 2, pages 1059-1071
Published in print February 2010 | ISSN: 0035-8711
Published online February 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.15943.x
Probing spectral properties of radio-quiet quasars searched for optical microvariability

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We obtained Sloan Digital Sky Survey spectra for a set of 37 radio-quiet quasars [(radio-quiet quasi-stellar objects (RQQSOs)] that had been previously examined for rapid small-scale optical variations, or microvariability. Their Hβ and Mg ii emission lines were carefully fit to determine linewidths (full width at half-maximum) as well as equivalent widths (EW) due to the broad emission-line components. The linewidths were used to estimate black hole masses and Eddington ratios, ℓ. Both EW and FWHM are anticorrelated with ℓ. The EW distributions provide no evidence for the hypothesis that a weak jet component in the RQQSOs is responsible for their microvariability.

Keywords: galaxies: active; quasars: emission lines; quasars: general

Journal Article.  7449 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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