Multi-Epoch Observations of the Redwing Excess in the Spectrum of 3C279

Abstract

It has been previously determined that there is a highly significant correlation between the spectral index from 10 GHz to 1350 $\mathring{A}$ and the amount of excess luminosity in the red wing of quasar CIV $\lambda$1549 broad emission lines (BELs). Ostensibly, the prominence of the red excess is associated with the radio jet emission mechanism and is most pronounced for lines of sight close to the jet axis. Studying the scant significant differences in the UV spectra of radio loud and radio quiet quasars might provide vital clues to the origin of the unknown process that creates powerful relativistic jets that appear in only about ten percent of quasars. In this study, the phenomenon is explored with multi-epoch observations of the MgII $\lambda$2798 broad line in 3C 279 which has one of the largest known redwing excesses in a quasar spectrum. The amount of excess that is detected appears to be independent of all directly observed optical continuum, radio or submm properties (fluxes or polarizations). The only trend that occurs in this sparse data is: the stronger the BEL, the larger the fraction of flux that resides in the redwing. It is concluded that more monitoring is needed and spectropolarimetry with a large telescope is essential during low states to understand more.

To appear in ApJ Letters

References in corpus (3)

• SMARTS optical and infrared monitoring of 12 gamma-ray bright blazars
• The Physical Nature of Polar Broad Absorption Line Quasars
• Optical Monitoring of the Broad-Line Radio Galaxy 3C390.3

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• The Extreme Red Excess in Blazar Ultraviolet Broad Emission Lines
• SALT long-slit spectroscopy of CTS C30.10: two-component Mg II line
• Emission Line Variability during a Nonthermal Outburst in the Gamma-Ray Bright Quasar 1156+295
• Variable broad lines and outflow in the weak blazar PBC J2333.9-2343
• SALT long-slit spectroscopy of HE 0435-4312: fast displacement in the Mg II emission line
• Selection of highly-accreting quasars: Spectral properties of FeII emitters not belonging to extreme Population A