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

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

2007-10-26

arxiv.org/abs/0710.5035v1

Astronomy and Astrophysics

Astrophysics

7 pages, 6 figures. To appear in MNRAS

Scientific paper

10.1111/j.1365-2966.2007.12656.x

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 =-0.55+/-0.04 and =-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.

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