Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915415w&link_type=abstract
American Astronomical Society, AAS Meeting #219, #154.15
Other
Scientific paper
In the context of AGN unification schemes rapid variability properties play an important role in understanding any intrinsic differences between sources in different classes. In this respect any clue based on spectral properties will be very useful toward understanding the mechanisms responsible for the origin of rapid small scale optical variations, or microvariability. Here we have added spectra of 46 radio-quiet quasars (RQQSOs) and Seyfert 1 galaxies to those of our previous sample of 37 such objects, all of which had been previously searched for microvariability. We took new optical spectra of 33 objects and obtained 13 others from the literature. Their H-beta and Mg II emission lines were carefully fit to determine line widths (FWHM) as well as equivalent widths (EW) due to the broad emission line components. The line widths were used to estimate black hole masses and Eddington ratios. Both EW and FWHM are significantly anti-correlated with Eddington ratio; the former trend was strengthened by our new work and the latter was confirmed. However the tendency seen in the smaller sample for sources exhibiting microvariability to be of lower luminosity was not confirmed in our full sample of 83 AGN. Most importantly, this whole sample of EW distributions provides no evidence for the hypothesis that a weak jet component in radio quiet AGNs is responsible for their microvariability.
Chand Hum
Gupta Alok C.
Joshi Ravi
Srianand Raghunathan
Wiita Paul J.
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