Hot Gas on the Arms of M51 & M83 traced by Emission Lines
Abstract
Galactic fountains operate in outer galaxy disks, where supernovae heat ambient gas to X-ray emission temperatures. However, the diffuse X-ray morphology in the spiral arms is often associated with recent active star formation, instead of the supernovae that should be distributed in a larger region. To better trace the hot gas in nearby face-on galaxies M51 and M83, we extract intensity maps of OVIII and OVII lines based on XMM-Newton/RGS data. The arms revealed by these emission lines show offset from the broad-band X-ray morphology. Furthermore, the strong OVII forbidden line implies the charge exchange process due to the interaction of hot gas and cold ISM.
- Publication:
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AAS/High Energy Astrophysics Division
- Pub Date:
- March 2019
- Bibcode:
- 2019HEAD...1710820Z