HEAD 2003 Meeting
Session 21. Active Galactic Nuclei III
Poster, Sunday-Wednesday, March 23, 2003, Duration of Meeting

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[21.15] Results of Chandra X-ray Observations of the GPS quasar sample.

A. Siemiginowska, T.L. Aldcroft (CfA), J. Bechtold (Steward Observatory), M. Blazejowski, M. Elvis (CfA)

We observed 11 Giga-Hertz Peaked Spectrum (GPS) sources with Chandra/ACIS-S. Here we present the results of our observations with emphasis on the X-ray spectral properties of the sample. We detect all 11 sources and find that they are powerful X-ray emitters, with X-ray luminosities in the range L(0.1-2keV) ~1044-1047 ergs s-1. We discuss the observed spectral parameters and the connection between GPS sources and the population of high luminosity quasars. Prior to Chandra, X-ray observations of a small sample of GPS sources indicated that associated intrinsic absorption is linked to this source class. The high spatial resolution of Chandra now allows us to study the environment of these sources within arc seconds of the strong compact core. GPS sources are known to have compact radio morphology (<~1kpc). They have been interpreted as either young counterparts of FR I radio galaxies or as ``frustrated'' AGN, in which the radio jets are not able to penetrate the host galaxy's gas and dust. We discuss possible processes responsible for the GPS quasars X-ray emission and the implications on our understanding of the GPS properties.


This research is funded in part by NASA contract NAS8-39073. Partial support for this work was provided by the National Aeronautics and Space Administration through Chandra Award Number GO-01164X and GO2-3148A issued by the Chandra X-Ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of NASA under contract NAS8-39073.

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Bulletin of the American Astronomical Society, 35#2
© 2003. The American Astronomical Soceity.