Radio Loudness of AGNs: Host Galaxy Morphology and the Spin Paradigm

Details Radio Loudness of AGNs: Host Galaxy Morphology and the Spin Paradigm Radio Loudness of AGNs: Host Galaxy Morphology and the Spin Paradigm

2007-07-16

arxiv.org/abs/0707.2369v1

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures included. Proceedings of the Workshop `Extragalactic Jets: Theory and Observation from Radio to Gamma Ray',

Scientific paper

We investigate how the total radio luminosity of AGN-powered radio sources depends on their accretion luminosity and the central black hole mass. We find that AGNs form two distinct and well separated sequences on the radio-loudness - Eddington-ratio plane. We argue that these sequences mark the real upper bounds of radio-loudness of two distinct populations of AGNs: those hosted respectively by elliptical and disk galaxies. Both sequences show the same dependence of the radio-loudness on the Eddington ratio (an increase with decreasing Eddington ratio), which suggests that another parameter in addition to the accretion rate must play a role in determining the jet production efficiency in active galactic nuclei, and that this parameter is related to properties of the host galaxy. The revealed host-related radio dichotomy breaks down at high accretion rates where the dominant fraction of luminous quasars hosted by elliptical galaxies is radio quiet. We argue that the huge difference between the radio-loudness reachable by AGNs in disc and elliptical galaxies can be explained by the scenario according to which the spin of a black hole determines the outflow's power, and central black holes can reach large spins only in early type galaxies (following major mergers), and not (in a statistical sense) in spiral galaxies.

Affiliated with

Also associated with

No associations

Rating

Radio Loudness of AGNs: Host Galaxy Morphology and the Spin Paradigm 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 Radio Loudness of AGNs: Host Galaxy Morphology and the Spin Paradigm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio Loudness of AGNs: Host Galaxy Morphology and the Spin Paradigm will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-195737