SIMBAD references

2003A&A...401..895R - Astronomy and Astrophysics, volume 401, 895-901 (2003/4-3)

The nature of the absorbing torus in compact radio galaxies.


Abstract (from CDS):

We present BeppoSAX observations of the two radio galaxies PKS 1934-63 and S5 1946+708. Strong Iron Kα lines are detected in both objects indicating that the two sources are absorbed by column densities higher than 1024cm–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 20pc 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 Kα 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''.

Abstract Copyright:

Journal keyword(s): galaxies: active - X-rays: galaxies

Nomenclature: Appendix A: [RWS2003] JHHMMSS.s+DDMMSS.s N=1.

Simbad objects: 8

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