2007A&A...467..519P -
Astronomy and Astrophysics, volume 467, 519-527 (2007/5-4)
The X-ray and radio connection in low-luminosity active nuclei.
PANESSA F., BARCONS X., BASSANI L., CAPPI M., CARRERA F.J., HO L.C. and PELLEGRINI S.
Abstract (from CDS):
We present the results of the correlation between the nuclear 2-10keV X-ray and radio (at 2cm, 6cm, and 20cm) luminosities for a well-defined sample of local Seyfert galaxies. We use a sample of low luminosity radio galaxies (LLRGs) for comparison. In both Seyfert and LLRG samples, X-ray and radio luminosities are significantly correlated over 8 orders of magnitude, indicating that the X-ray and radio emission sources are strongly coupled. Moreover, both samples show a similar regression slope, LX∝LR0.97, but Seyfert galaxies are three orders of magnitude less luminous in the radio band than LLRGs. This suggests that either similar physical mechanisms are responsible for the observed emission or a combination of different mechanisms ends up producing a similar correlation slope. Indeed, the common belief for LLRG is that both the X-ray and radio emission are likely dominated by a relativistic jet component, while in Seyfert galaxies the X-ray emission probably arises from a disk-corona system and the radio emission is attributed to a jet/outflow component. We investigate the radio loudness issue in the two samples and find that the Seyfert galaxies and the LLRGs show a different distribution of the radio loudness parameters. No correlation is found between the luminosity and the radio loudness; however, the latter is related to the black hole mass and anti-correlated with the Eddington ratio. The dichotomy in the radio loudness between Seyfert and LLRG observed down to low Eddington ratios, L2–10keV/LEdd∼10–8, does not support the idea that the origin of the radio loudness is due to a switch in the accretion mode.
Abstract Copyright:
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Journal keyword(s):
accretion, accretion disks - X-rays: galaxies - galaxies: Seyfert - galaxies: nuclei
Simbad objects:
15
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