Synchrotron Constraints on a Hybrid Cosmic-Ray and Thermally-Driven Galactic Wind

Details Synchrotron Constraints on a Hybrid Cosmic-Ray and Thermally-Driven Galactic Wind Synchrotron Constraints on a Hybrid Cosmic-Ray and Thermally-Driven Galactic Wind

2009-04-13

arxiv.org/abs/0904.1964v2

Astrophys.J.711:13-24,2010

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

13 pages, 10 figures; accepted to ApJ

Scientific paper

10.1088/0004-637X/711/1/13

Cosmic rays and magnetic fields can substantially impact the launching of large-scale galactic winds. Many researchers have investigated the role of cosmic rays; our group previously showed that a cosmic-ray and thermally-driven wind could explain soft X-ray emission towards the center of the Galaxy. In this paper, we calculate the synchrotron emission from our original wind model and compare it to observations; the synchrotron data shows that earlier assumptions about the launching conditions of the wind must be changed: we are required to improve that earlier model by restricting the launching region to the domain of the inner "Molecular Ring", and by decreasing the magnetic field strength from the previously assumed maximum strength. With these physically-motived modifications, we find that a wind model can fit both the radio synchrotron and the X-ray emission, although that model is required to have a higher gas pressure and density than the previous model in order to reproduce the observed X-ray emission measure within the smaller `footprint'. The drop in magnetic field also decreases the effect of cosmic-ray heating, requiring a higher temperature at the base of the wind than the previous model.

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