期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 383, 期 4, 页码 1513-1518出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2007.12656.x
关键词
galaxies : active; galaxies : nuclei; quasars : general
Starting from a sample of Sloan Digital Sky Survey quasars appearing also in the Two-Micron All-Sky Survey, we study the continuum properties of similar to 1000 objects observed in eight bands, from near-infrared to ultraviolet. We construct the mean spectral energy distribution ( SED) and compare and contrast the continua of radio-loud and radio-quiet quasar (RLQ and RQQ, respectively) 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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