The nature of the absorbing torus in compact Radio Galaxies

Details The nature of the absorbing torus in compact Radio Galaxies The nature of the absorbing torus in compact Radio Galaxies

2003-01-27

arxiv.org/abs/astro-ph/0301522v1

Astron.Astrophys.401:895-902,2003

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures, accepted for publication in Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361:20030124

We present BeppoSAX observations of the two radio galaxies PKS 1934-63 and S5 1946+708. Strong Iron Kalpha lines are detected in both objects indicating that the two sources are absorbed by column densities higher than 10^24 cm^(-2). Combining radio continuum, HI absorption and X-ray data we can constrain the physical state and the dimensions of the absorber. We find that the putative obscuring torus is molecular and located at a distance higher than 20 pc from the center in S5 1946+70. In PKS 1934-63 no radio nucleus has been observed. If this is due to free-free absorption a radius of only a few pc is inferred. Since the Kalpha lines have been detected only at 90% confidence, we also discuss the implications if they would be not as strong as found from our data. From our results it appears that the combination of hard X-ray data and spatially resolved HI absorption measurements provides a powerful diagnostic for conditions in the absorbing ``torus''.

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