The Discovery of Fermi Bubbles: Multi-wavelength Observations and Implications to the Past Activity of Galactic Center

Details The Discovery of Fermi Bubbles: Multi-wavelength Observations and Implications to the Past Activity of Galactic Center The Discovery of Fermi Bubbles: Multi-wavelength Observations and Implications to the Past Activity of Galactic Center

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21913702s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #137.02

Astronomy and Astrophysics

Astronomy

Scientific paper

Data from the Fermi-LAT reveal two large gamma-ray bubbles, extending 50 degrees above and below the Galactic center, with a width of about 40 degrees in longitude. The gamma-ray emission associated with these bubbles has a significantly harder spectrum (dN/dE E-2) than the IC emission from electrons in the Galactic disk, or the gamma-rays produced by decay of pions from proton-ISM collisions. The bubbles are spatially correlated with the hard-spectrum microwave excess known as the WMAP haze; the edges of the bubbles also line up with features in the ROSAT X-ray maps at 1.5 - 2 keV. We further discovered arge cocoon structures in Fermi gamma-ray data, which is presumably produced by relativistic large scale jets. I will summarize observational evidence of the Fermi bubbles and cocoons, including features of polarization and rotation measure of the bubble edges. The bubbles have sharp edges in gamma-ray, X-ray, and polarized microwave emission. I'm going to argue that these Galactic gamma-ray bubbles are ongoing shocks (instead of a stable structure), and were most likely created by some large episode of energy injection in the Galactic center, such as past accretion events onto the central massive black hole, or a nuclear starburst in the last ∼10 Myr.

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