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Old January 19th 17, 04:53 AM posted to sci.astro.research
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Default 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