ORIGIN OF THE FERMI BUBBLE

Journal Article · Sun Apr 10 00:00:00 EDT 2011 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/731/1/L17· OSTI ID:21562739

Cheng, K -S; Chernyshov, D O; Dogiel, V A ^[1]; Ko, C -M; Ip, W -H ^[2]

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1. Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong (China)
2. Institute of Astronomy, National Central University, Chung-Li 32054, Taiwan (China)

Fermi has discovered two giant gamma-ray-emitting bubbles that extend nearly 10 kpc in diameter north and south of the Galactic center. The existence of the bubbles was first evidenced in X-rays detected by ROSAT and later WMAP detected an excess of radio signals at the location of the gamma-ray bubbles. We propose that periodic star capture processes by the galactic supermassive black hole, Sgr A*, with a capture rate 3 x 10{sup -5} yr{sup -1} and energy release {approx}3 x 10{sup 52} erg per capture can produce very hot plasma {approx}10 keV with a wind velocity {approx}10{sup 8} cm s{sup -1} injected into the halo and heat up the halo gas to {approx}1 keV, which produces thermal X-rays. The periodic injection of hot plasma can produce shocks in the halo and accelerate electrons to {approx}TeV, which produce radio emission via synchrotron radiation and gamma rays via inverse Compton scattering with the relic and the galactic soft photons.

• OSTI ID: 21562739
• Journal Information: Astrophysical Journal Letters, Vol. 731, Issue 1; Other Information: DOI: 10.1088/2041-8205/731/1/L17; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
BLACK HOLES
BUBBLES
CAPTURE
COMPTON EFFECT
ELECTRONS
EMISSION
GALAXIES
GAMMA RADIATION
HOT PLASMA
INJECTION
ORIGIN
STARS
SYNCHROTRON RADIATION
BASIC INTERACTIONS
BREMSSTRAHLUNG
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
INTAKE
INTERACTIONS
IONIZING RADIATIONS
LEPTONS
PLASMA
RADIATIONS
SCATTERING