Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1426s&link_type=abstract
American Astronomical Society, AAS Meeting #211, #14.26; Bulletin of the American Astronomical Society, Vol. 39, p.763
Astronomy and Astrophysics
Astronomy
Scientific paper
The ROSAT All Sky Survey (Snowden et al. 1993) discovered a pill-box shaped region of X-ray emission towards the galactic center. Elsewhere, we postulate that the emission is caused by a cosmic-ray and thermally driven Galactic wind (Everett et al, submitted). The objective of this project is to model synchrotron emission from a hypothetical Galactic wind to see whether the model can be tested with radio observations. The wind is launched from the Galactic disk from Galactic radii 1.5 kpc < R < 4.5 kpc to 1 Mpc in height. Observations of the corresponding cylindrical annulus geometry are simulated from Earth at z=0 height and R=8 kpc.
We begin with a Galactic wind model fit by Everett et al. to the X-ray emission and integrate the equation for synchrotron intensity on lines of sight through the wind. Initially, we model simple launch geometry to validate our tools and compare the results with analytic single-ray calculations to verify accuracy. We choose to model synchrotron radiation at 1.5 GHz as all-sky surveys observe near this frequency. The result of the model currently predicts that the synchrotron flux from the Galactic wind should be observable using radio telescopes, such as the Green Bank Telescope in West Virginia, to Galactic latitude b +/- 20 degrees and Galactic longitude l +/- 35 degrees. Comparisons to all-sky surveys will test the existence of a wind-driven synchrotron spectrum. If a synchrotron spectrum comparable to the Galactic wind model is observed, it could provide evidence for the existence of a cosmic-ray and thermally driven Galactic wind.
Everett John
Schiller Quintin
Zwiebel E.
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