X-ray, optical and radio study of radio-loud quasars.

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Quasars: X Rays, Quasars: Optical Observations, Quasars: Radio Radiation

Scientific paper

ROSAT All Sky Survey (RASS) fluxes and upper limits have been obtained for a new, complete sample of 408-MHz-selected quasars. Thirty percent were detected above the RASS threshold, preferentially those with low redshifts (z < 1), bright radio cores and optical emission. This might imply the presence of anisotropic X-ray and optical continuum components. In addition, the authors note the paucity of compact, steep-spectrum Molonglo Quasar Sample (MQS) quasars detected on the RASS and also comment on "optically-quiet" MQS quasars which are suggested to form an inhomogeneous group.

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