2006A&A...457L..17H


Query : 2006A&A...457L..17H

2006A&A...457L..17H - Astronomy and Astrophysics, volume 457, L17-20 (2006/10-2)

The small dispersion of the mid IR - hard X-ray correlation in active galactic nuclei.

HORST H., SMETTE A., GANDHI P. and DUSCHL W.J.

Abstract (from CDS):

We investigate mid-infrared and X-ray properties of the dusty torus in unification scenarios for active galactic nuclei. We use the relation between mid IR and hard X-ray luminosities to constrain AGN unification scenarios. With VISIR at the VLT, we have obtained the currently highest angular resolution (0.35" FWHM) narrow-band mid infrared images of the nuclei of 8 nearby Seyfert galaxies. Combining these observations with X-ray data from the literature we study the correlation between their mid IR and hard X-ray luminosities. We find that the rest frame 12.3µm (LMIR) and 2-10keV (LX) luminosities are correlated at a highly significant level. The best fit power-law to our data is logLMIR∝(1.60±0.22)logLX, showing a much smaller dispersion than earlier studies. The similarity in the logLMIR/logLX ratio between Sy1s and Sy2s even using high angular resolution MIR data implies that the similarity is intrinsic to AGN and not caused by contamination from extra-nuclear emission. This supports clumpy torus models. The exponent of the correlation constrains the inner geometry of the torus.

Abstract Copyright:

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

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 ESO 113-45 Sy1 01 23 45.7631533440 -58 48 20.808928944   14.08 13.83 13.34   ~ 882 0
2 NGC 526 Sy2 01 23 54.3772245792 -35 03 55.710850788   14.76 14.60 13.46   ~ 332 1
3 NGC 3783 Sy1 11 39 01.7096819040 -37 44 19.009642992   12.46 13.43 11.33 12.1 ~ 1651 0
4 M 58 Sy2 12 37 43.5 +11 49 06 10.80 10.48 9.66     ~ 1081 2
5 NGC 4593 Sy1 12 39 39.4435107024 -05 20 39.034988448   13.95 13.15     ~ 1091 0
6 IC 5063 Sy2 20 52 02.15 -57 04 06.7   12.92 13.60 11.30   ~ 653 1
7 Mrk 1513 Sy1 21 32 27.8162556672 +10 08 19.252365396   14.92 14.64     ~ 614 0
8 NGC 7314 Sy2 22 35 46.1985355872 -26 03 01.564993476   11.62 13.11 10.61 11.4 ~ 568 0

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