Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-14
Mon.Not.Roy.Astron.Soc. 339 (2003) 1223
Astronomy and Astrophysics
Astrophysics
19 pages, 11 figures, accepted to MNRAS
Scientific paper
10.1046/j.1365-8711.2003.06278.x
We examine the hypothesis that there exists a simple scaling between the observed velocities of jets found in Young Stellar Objects (YSOs) and jets found in Active Galactic Nuclei (AGN). We employ a very simplified physical model of the jet acceleration process. We use time-dependent, spherically symmetric wind models in Newtonian and relativistic gravitational fields to ask whether the energy input rates required to produce the jet velocities observed in YSOs (of about 2 $\times$ the escape velocity from the central object) can also produce AGN jet velocities (Lorentz factors of $\gamma \sim$ 10). Such a scaling would be expected if there is a common production mechanism for such jets. We demonstrate that such a scaling does exist, provided that the energy input process takes place sufficiently deep in the gravitational potential well, enabling physical use to be made of the speed of light as a limiting velocity, and provided that the energy released in the accretion process is imparted to a small fraction of the available accreting material.
King Andrew R.
Price Daniel J.
Pringle James E.
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