Basic facts about Fermi bubbles
Consider first the basic facts.
- Fermi bubbles are located at the opposite sides of the galactic plane at the center of the galaxy. The radii of the bubbles are 12.5 kly and they expand at a rate of a few Mm/s (of order 10-2 c).
- Fermi bubbles consist of very hot gas, cosmic rays and magnetic fields. They are characterized by very bright diffuse gamma ray emissions.
- Quite recently, so-called eRosita bubbles were discovered (see this). They have a size scale, which is twice that for Fermi bubbles. Both Fermi bubbles, eRosita bubbles and microwave haze are believed to be associated with an emission of jets.
- Fermi bubbles could involve new exotic physics. The IceCube array in Antarctica (see this) has reported 10 hyper-high-energy neutrinos sourced from the bubbles with highest energies in 20-50 TeV range.
One particular rough estimate for the release of energy from Sagittarius A* is 1050 Joules, which corresponds to 103MSun (solar mass is MSun ≈ 1030 kg). The estimate of the article for the energy would correspond to 102MSun.
Fermi bubbles as local Big-Bangs?
Could Fermi bubbles be magnetic bubbles produced by the general mechanism already discussed and perhaps even modellable as local Big Bangs?
- From the data summarized above, one can deduce that the mass concentrated at the bubbles is below the total energy released from Sagittarius A*. It is in the range of 102--103 solar masses. This mass need not of course correspond to mass of the Fermi sphere.
- The conservative option is that the expanding bubble has driven mass to the Fermi sphere as in the standard model of the Local Bubble. Recall that Local Bubble has a mass of 106 solar masses and is suggested to be caused by 15 supernova explosions emitting typically 1044 Joules: 1045 Joules corresponds to mass about 10-2MSun. For this option the mass lost by Sagittarius A* would be completely negligible with that of the Fermi bubble.
- The TGD inspired option is that the mass of Fermi Bubble is dark gravitational mass (102-103)MSun at the gravitational flux tubes of the dark flux tube tangles emitted by the Sagittarius A* as a pair of jets formed by the expanding Fermi spheres. These tangeles would be characterized by gravitational Planck constant.
- The gravitational Planck constant is partially determined by the mass of the galactic blackhole, which is about 4× 106MSun. The value of gravitational Planck constant would be huge and gravitational Compton length rS/2β0, where rS=1.2× 107 km is the Schwartschild radius.
- Lloc= 12.5 kly corresponds to the radius of the bubble and the length of a typical flux tube .
- Rloc= (3/8π GLloc)-1/4 corresponds to the thickness of the flux tubes and would be of order μm from (Lloc/Lc)1/4 scaling and Rc≈ 10-4 m.
- Local Hubble constant corresponds to Hloc= v/Lloc∼ 103 Hc, where v=(x/3)× 10-2c, x of order 1, is the estimate for the expansion velocity of the bubble. The TGD based model suggests that the identification β0=v/c makes sense in the beginning of the expansion. Note that for the Sun-Earth model the value of β0 is of order .5× 10-3.
For a summary of earlier postings see Latest progress in TGD.