Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-12
Astrophys.J. 604 (2004) L81-L84
Astronomy and Astrophysics
Astrophysics
Submitted in ApJ Letters on Jan. 14, 2004
Scientific paper
10.1086/386339
A puzzling feature of the {\it Chandra}--detected quasar jets is that their X-ray emission decreases faster along the jet than their radio emission, resulting to an outward increasing radio to X-ray ratio. In some sources this behavior is so extreme that the radio emission peak is located clearly downstream of that of the X-rays. This is a rather unanticipated behavior given that the inverse Compton nature of the X-rays and the synchrotron radio emission are attributed to roughly the same electrons of the jet's non-thermal electron distribution. In this note we show that this morphological behavior can result from the gradual deceleration of a relativistic flow and that the offsets in peak emission at different wavelengths carry the imprint of this deceleration. This notion is consistent with another recent finding, namely that the jets feeding the terminal hot spots of powerful radio galaxies and quasars are still relativistic with Lorentz factors $\Gamma \sim 2-3$. The picture of the kinematics of powerful jets emerging from these considerations is that they remain relativistic as they gradually decelerate from Kpc scales to the hot spots, where, in a final collision with the intergalactic medium, they slow-down rapidly to the subrelativistic velocities of the hot spot advance speed.
Georganopoulos Markos
Kazanas Demosthenes
No associations
LandOfFree
Witnessing the gradual slow-down of powerful extragalactic jets: The X-ray -- optical -- radio connection 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 Witnessing the gradual slow-down of powerful extragalactic jets: The X-ray -- optical -- radio connection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Witnessing the gradual slow-down of powerful extragalactic jets: The X-ray -- optical -- radio connection will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-84944