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Single vs Double hot spots for BH Jets? (e.g. Pictor A)
I should mention, regarding the rain idea I'm studying, that if matter is s=
hot out of a galaxy along the axis of rotation by BH jet activity, and it s= ubsequenty "rain's" back down onto the galaxy, the NET angular momentum of= the "rain" would also be zero. It would also be orthogonal to (have angul= ar momentum vector orthogonal to) the angular momentum of the galaxy. Thus, rain if it exists, will reduce net angular momentum of a galaxy, shut= ting down rotation and evolving the galaxy from spiral forms toward EO. This is possible if the individual particles, stars, gas, dust, rain back d= own along highly elliptical geometries with long axis coincident with galac= tic rotation vector, AND, the rain is random with regards to which side of = the central black hole it falls on. This way, the momentum vectors for eac= h "particle" are roughly within the disk of the galaxy's rotation, ~normal = to it's angular rotation vector. But the vector for each particle is diffe= rent so that there is no net rotation axis. In a sense, the rain would probably be a bit like a faint bar of stuff that= thermalization would randomize......the rain would become random like orbi= ts in a GC, and, the matter of the galaxy with which the interaction took p= lace would also become more random, more like an elliptical. So, BH jets, are observed to eject matter. **IF** that matter rains back d= own, then it should act to evolve the galaxy toward elliptical by some degr= ee. More rain, more evolution. Question is, can any observation detect such a rain IF it exists? We see f= aint extensions. But finding their velocity is harder still and I don't kn= ow of any observation for the velocity of the faint extended material along= BH jet axis'. This mechanism is why the EO to Bar evolution path makes no sense to me. T= here are only old stars in ellipticals. Barred spirals have newborn stars.= And most galaxies observed are ellipticals, and they have only old stars.= EO ought to be the end game it seems to me. Is it the general expectation that all elliptical galaxies will evolve to b= arred spirals eventually? rt |
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