Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-06-10
New Astron.Rev. 48 (2004) 403-405
Astronomy and Astrophysics
Astrophysics
Paper presented at the 2nd Veritas Symp. on the TeV Astrophysics of Extragalactic Sources, Chicago, Il, April, 2003. To be pub
Scientific paper
10.1016/j.newar.2003.12.047
The peak of the de-absorbed energy distribution of the TeV emitting BLs can reach values up to ~10 TeV. In the context of SSC models of relativistic uniformly moving blobs of plasma, such high energy peak emission can be reproduced only by assuming Doppler factors delta ~ 50. However, such high values strongly disagree with the unification of FR I radio galaxies and BLs. Additionally, the recent detections of slow, possibly sub-luminal velocities in the sub-pc scale jets of the TeV BLS MKN 421 and MKN 501 suggest that the jets in these sources decelerate very early to mildly relativistic velocities (Gamma \~ a few). Here, we examine the possibility that the relativistic flow in the TeV BLs decelerates lognitudinally. In this case, modest Lorentz factors (Gamma~15), decelerating down to values compatible with the recent interferometric observations, can reproduce the ~ few TeV peak energy of these sources. Furthermore, such decelerating flows naturally reproduce the observed broadband BL-FR I luminosity ratios.
Georganopoulos Markos
Kazanas Demosthenes
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