Computer Science
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003xmm..prop....4f&link_type=abstract
XMM-Newton Proposal ID #02000607
Computer Science
Pks 2243-123, Pks 2345-16, Pks 2223+21, Cta 102, Pks 1629+12, Pks 0528+134, Pks 2134+004, Xmm-Newton Proposal 02000607
Scientific paper
Giga-Hertz-Peaked Spectrum (GPS) and Compact Steep Spectrum (CSS) sources are believed to be either young or alternatively ``frustrated versions'' of the classical large-scale radio sources. Their defining properties are the compactness and the convex radio spectrum produced either via synchrotron-self absorption or free-free absorption. In X-ray surveys they constitute a high fraction of sources at high redshifts, they are the brightest quasars at radio, optical, and X-ray wavelengths, and they are frequently associated with intrinsic excess absorption. X-ray observations can provide important information on the GPS/CSS environment and on the most plausible model for them. Their spectral and general properties in the X-ray band are still poorly known.
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