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Paper: First Chandra Images of GPS quasars
Volume: 290, Active Galactic Nuclei: from Central Engine to Host Galaxy
Page: 361
Authors: Siemiginowska, A.; Aldcroft, T. L.; Elvis, M.; Bechtold, J.; Brunetti, G.; Stanghellini, C.
Abstract: Giga-Hertz Peaked Spectrum (GPS) and Compact Steep Spectrum (CSS) (see O'Dea 1998 for review) sources are known to have compact radio morphology (< ∼1kpc-10kpc respectively). 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. There are just a few examples of GPS galaxies with a very faint Mpc scale radio structures, which are interpreted as relics of past activity in the source. Only a small sample of GPS/CSS source were observed with low resolution X-ray telescopes before Chandra, indicating that associated intrinsic absorption could be present in some sources. The high spatial resolution of Chandra allows us to study the environment of these sources within arcsec from the strong compact core. Thus far we have detected ∼30 arcsec X-ray jets in two sources and faint X-ray emission within 10 arcsec of the core. Five more sources are scheduled for Chandra observations before May and we plan to include them in our presentation. Our goal is to study the extended emission associated with the GPS/CSS core in search of signatures of their intermittent activity. We will discuss implications of our current observations and possible theoretical scenarios for the intermittent activity of these sources including disk instabilities and feedback mechanism also considered recently for radio sources in clusters.
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