An X-ray Exposure of the Highest-redshift Blazar: IC/CMB Jets

Physics

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Chandra Proposal Id #06700400

Scientific paper

We have just discovered a QSO at z=5.47 in a survey of compact flat-spectrum radio sources with properties similar to the EGRET blazars. Exploratory VLBA observations confirm that the source has a pc-scale jet. This is the highest-redshift blazar known and, with a known jet position angle, an excellent source to search for an extended X-ray jet produced by Compton upscatter of the CMB. There is also marginal evidence for gamma-ray emission; detection of the core at X-ray wavelengths will help constrain the level of this IC component. This QSO can be an exciting laboratory for the exploration of jet physics and high energy emission. An exploratory CXO image sets the stage.

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