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Identifying the Radio Bubble Nature of the Microwave Haze · Around

2012

Identifying the Radio Bubble Nature of the Microwave Haze

Dobler, Gregory

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Using 7-year data from the Wilkinson Microwave Anisotropy Probe I identify a sharp "edge" in the microwave haze at high Galactic latitude (35 deg < |b| < 55 deg) that is spatially coincident with the edge of the "Fermi Haze/Bubbles".

This finding proves conclusively that the edge in the gamma-rays is real (and not a processing artifact), demonstrates explicitly that the microwave haze and the gamma-ray bubbles are indeed the same structure observed at multiple wavelengths, and strongly supports the interpretation of the microwave haze as a separate component of Galactic synchrotron (likely generated by a transient event) as opposed to a simple variation of the spectral index of disk synchrotron.
In addition, combining these data sets allows for the first determination of the magnetic field within a radio bubble using microwaves and gamma-rays by taking advantage of the fact that the inverse Compton gamma-rays are primarily generated by scattering of CMB photons at these latitudes, thus minimizing uncertainty in the target radiation field.
Assuming uniform volume emissivity, I find that the magnetic field within our Galactic microwave/gamma-ray bubbles is ~5 muG above 6 kpc off of the Galactic plane.

Built on

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Similar

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2010
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2011
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2011
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Then

Guo, F., & Mathews, W. G. 2011, arXiv:1103.0055
Original
2011
Later among the works it cites.
Guo, F., Mathews, W. G., Dobler, G., & Oh, S. P. 2011, arXiv:1110.0834
Original
2011
Later among the works it cites.
Mertsch, P., & Sarkar, S. 2011, Physical Review Letters, 107, 091101
2011
Later among the works it cites.
Pietrobon, D., et al. 2011, arXiv:1110.5418
Original
2011
Later among the works it cites.
Dobler, G. 2012, ApJ, 750, 17
2012
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The Fermi-LAT Collaboration. 2012, arXiv:1202.4039

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