On the relation between the coronal line emission and the IR/X-ray emission in Seyfert galaxies

Details On the relation between the coronal line emission and the IR/X-ray emission in Seyfert galaxies On the relation between the coronal line emission and the IR/X-ray emission in Seyfert galaxies

2001-09-25

arxiv.org/abs/astro-ph/0109455v2

Mon.Not.Roy.Astron.Soc. 329 (2002) 309

Astronomy and Astrophysics

Astrophysics

14 pages, 3 figures To be published in MNRAS (accepted)

Scientific paper

10.1046/j.1365-8711.2002.04985.x

The relation between the X-ray, the coronal line and the infrared (IR) emissions in a sample of the brightest known Seyfert galaxies is analysed. A close relationship between the absorption-corrected soft X-ray emission and both the mid-IR and the coronal line emission is found for the Seyfert type 2 objects in the sample. The coronal line and the X-ray emissions are both main tracers of the central activity, hence their relationship with the mid-IR emission points to nuclear energetic process as the main responsibles of the heating of the circumnuclear dust. On the other hand, the above relations do not seem to hold for the Seyfert type 1 discussed in the sample, at least when the comparisons are done in a flux diagram. This is partially because of the reduced number of objects of this type analysed in this work and the fact that the measured soft X-ray emission in Seyfert 1s is systematically larger, by at least an order of magnitude, than that in the Seyfert 2 counterparts. Finally, the hard X-ray emission in the studied sample appears unrelated to either the mid-IR or the coronal line emission.

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