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Single vs Double hot spots for BH Jets? (e.g. Pictor A)
Example object, Pictor A
http://chandra.harvard.edu/photo/2016/pictora/ in particular, the x ray Chandra image: http://chandra.harvard.edu/photo/201...ctora_xray.jpg Question 1: Has anyone proposed any model that describes a mechanism to produce a single BH jet, or, alternating BH jets (e.g. the jet shoots one way for a while, then the other way for a while, alternating back and forth)? Question 2: *IF* there are 2 jets active, and both are active for the same duration, then wouldn't we observe a pair of Hot Spots of the same size? We clearly see a hot spot on the right side, but there isn't one on the left side (there are other sources, but they are all smaller in angular size, and there isn't a source at the location of the protrusion where the jet recently had been.) If one is to contend that the jet wanders, and that's why we don't see the counter hot spot because it recently moved from where the optical / radio extension is, then the same must be true for the primary jet coming toward us.............is there an example of a primary jet coming toward us *without* a hot spot? Question 3: If the primary jet on the right side were to turn off at time 0, how long would it take for the heated x ray gas to cool off so that we no longer saw a hot spot? tens, thousands, millions of years? I have no sense on time scale for this intergalactic gas cooling process so any guesses appreciated. The point is, if the counter jet hot spot has cooled due to motion, the cooling time is indicative of the jet pointing change velocity if there is no observable hot spot. But the same must then apply to all of the many similar objects that do not show counter jet hot spots. Am I missing something important here? What is it? Thanks, rt |
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