Combined VLBI- and X-ray Observations of Active Galactic Nuclei

Details Combined VLBI- and X-ray Observations of Active Galactic Nuclei Combined VLBI- and X-ray Observations of Active Galactic Nuclei

2004-09-13

arxiv.org/abs/astro-ph/0409300v1

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, Proceedings of the 7th EVN Symposium held in Toledo, Spain in October 2004, needs evn2004.cls

Scientific paper

Compact radio cores in radio-loud active galactic nuclei (AGNs) are classical targets of Very-Long-Baseline interferometric (VLBI) research. Until today little has been known about their X-ray properties in comparison to radio-quiet AGNs. Here, we present results from a systematic X-ray spectral survey of radio-loud AGNs. This study is based on a statistically complete sample of regularly monitored compact, extragalactic radio jets from the VLBA 2 cm Survey and makes use of high-quality X-ray spectroscopic data from the archives of the X-ray observatories ASCA, BeppoSax, CHANDRA, and XMM-Newton. Combined VLBI and X-ray observations of AGNs can yield direct observational links between the central parsecs of extragalactic jets and dynamical processes within the accretion flows around supermassive black holes. It is essential to establish such links, which might have the power to attack the unsolved problem: "What makes an AGN radio-loud?" We present some early results from our survey project and report briefly on detailed studies of 0716+714, NGC 1052, and 3C 390.3.

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