NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-23 T10:29:10 PDT
Help | Comment | NED Home

For refcode 2013MNRAS.430.3445M:
Retrieve 16275 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by Royal Astronomical Society. 2013MNRAS.430.3445M The covering factor of warm dust in quasars: a view from the Wide-field Infrared Survey Explorer All-Sky Data Release Ma, Xiang-Cheng; Wang, Ting-Gui Abstract. By combining newly obtained infrared photometric data from the All-Sky Data Release of the Wide-field Infrared Survey Explorer with spectroscopic data from the Seventh Data Release of the Sloan Digital Sky Survey, we study the covering factor of warm dust (CF_WD_) for a large quasar sample, as well as the relations between CF_WD_ and other physical parameters of quasars. We find a strong correlation between the flux ratio in the mid-infrared to near-ultraviolet and the slope of the near-ultraviolet spectra, which is interpreted as a dust extinction effect. After correcting for dust extinction utilizing the above correlation, we examine the relations between CF_WD_ and active galactic nucleus properties: bolometric luminosity (L_bol_), black hole mass (M_BH_) and Eddington ratio (L/L_Edd_). We confirm the anticorrelation between CF_WD_ and L_bol_. Further, we find that CF_WD_ is anticorrelated with M_BH_ but is independent of L/L_Edd_. Radio-loud quasars are found to follow the same correlations as radio-quiet quasars. Monte Carlo simulations show that the anisotropy of the UV-optical continuum of the accretion disc can have a significant effect, but is not likely to dominate the CF_WD_-L_bol_ correlation. Key words: catalogues, galaxies: active, quasars: general, infrared: galaxies
Retrieve 16275 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home