The X-ray and Radio Connection in Low-luminosity Active Nuclei

Details The X-ray and Radio Connection in Low-luminosity Active Nuclei The X-ray and Radio Connection in Low-luminosity Active Nuclei

2007-01-18

arxiv.org/abs/astro-ph/0701546v1

Astronomy and Astrophysics

Astrophysics

11 pages, 7 figures, accepted for publication on A&A including referee's comments

Scientific paper

10.1051/0004-6361:20066943

We present the results of the correlation between the nuclear 2-10 keV 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 LLRGs 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, L(X)$\propto$ L(R)^(0.97), 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, L(2-10)/L(Edd) $\sim$ 10^(-8), does not support the idea that the origin of the radio loudness is due to a switch in the accretion mode.

Affiliated with

Also associated with

No associations

Rating

The X-ray and Radio Connection in Low-luminosity Active Nuclei does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The X-ray and Radio Connection in Low-luminosity Active Nuclei, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The X-ray and Radio Connection in Low-luminosity Active Nuclei will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-260707