EAS Publications Series
Volume 56, 2012The Role of the Disk-Halo Interaction in Galaxy Evolution: Outflow vs. Infall?
|Page(s)||73 - 76|
|Section||Structure and Components of the ISM in Galaxies|
|Published online||17 September 2012|
Miguel A. de Avillez (ed)
EAS Publications Series, 56 (2012) 73–76
Cosmic Ray- and Thermal-Pressure Driven Winds: Does the Milky Way Host a Kpc-Scale Outflow?
1 Departments of Physics & Astronomy, Univ. of Wisconsin–Madison, and Center for Magnetic Self-Organization in Laboratory and Space Plasmas, USA
2 Department of Physics, Univ. of Wisconsin–Whitewater, USA
3 Department of Physics, Univ. of Wisconsin–Madison, USA
4 Department of Astronomy, Univ. of Wisconsin–Madison, USA
We show that the X-ray emission observed towards the center of our Milky Way Galaxy is consistent with a strong (2.1 M⊙/yr) outflow powered by both cosmic-ray pressure and thermal-gas pressure. In addition, the inferred launch parameters of such an outflow seem consistent with conditions inferred in the central Milky Way and other galaxies (although it is not clear if a significant vertical magnetic field exists in the center of the Galaxy). We also show that in galaxies with cosmic-ray pressure, gas pressure, and a vertical magnetic field component, cosmic-ray pressure can yield outflows over a wider range of conditions.
© EAS, EDP Sciences, 2012