The NIR to UV continuum of radio loud vs. radio quiet quasars

Abstract

Starting from a sample of SDSS quasars appearing also in the 2MASS survey, we study the continuum properties of about 1000 objects observed in 8 bands, from NIR to UV. We construct the mean spectral energy distribution (SED) and compare and contrast the continua of radio loud (RLQ) and radio quiet (RQQ) objects. The SEDs of the two populations are significantly different in the sense that RLQs are redder, with power law spectral indices <alpha(RLQ)>=-0.55+/-0.04 and <alpha(RQQ)>=-0.31+/-0.01 in the spectral range between 10^14.5 and 10^15.35 Hz. This difference is discussed in terms of different extinctions, different disc temperatures, or slopes of the non-thermal component.

arXiv comment7 pages, 6 figures. To appear in MNRAS

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Cited by in corpus (14)

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• X-ray Emission from Optically Selected Radio-Intermediate and Radio-Loud Quasars
• New Insights on the QSO Radio-Loud/Radio-Quiet Dichotomy: SDSS Spectra in the Context of the 4D Eigenvector1 Parameter Space
• Young T-Dwarf Candidates in IC 348
• Star formation in high-redshift quasars: excess [O II] emission in the radio-loud population
• Exploring X-ray and radio emission of type 1 AGN up to z ~ 2.3
• Evidence for higher black hole spin in radio-loud quasars
• Intranight polarization variability in radio-loud and radio-quiet AGN
• Downsizing of supermassive black holes from the SDSS quasar survey (II). Extension to z~4
• An Apparent Redshift Dependence of Quasar Continuum: Implication for Cosmic Dust Extinction?
• Broad-band spectral energy distribution of 3000 Angstroem break quasars from the Sloan Digital Sky Survey
• New Clues to Jet Launching: The inner disks in radio loud quasars may be more stable
• Probing the rapid formation of black holes and their galaxy hosts in QSOs
• Polarization of broad line emission from AGNs with determined virial factors