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Recent X-ray Observations of Disk Galaxies: Tracing the Dynamic Interstellar Medium | | Q. Daniel Wang
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19 Aug 2000 | | Subject: | astro-ph | | Abstract: | I review recent results from our deep ROSAT and Chandra observations of two galaxies, M101 and NGC 4631, in fields of exceptionally low Galactic extinction. Large amounts of X-ray-emitting gas are detected in these galaxies. Such gas is produced primarily in massive star forming regions and have an average characteristic temperature of a few times $10^6$ K. Cooler gas ($sim 10^6$ K) is found typically outside galactic disks and may represent outflows from blown-out superbubbles. Propagation of star formation, driven by the expansion of hot gas, appears to be operating in giant HII complexes. A substantial fraction of photo-evaporated gas in such complexes may be mass-loaded into hot gas, which explains their large X-ray luminosities. These processes likely play an important role in determining the global properties of the interstellar medium, especially the disk/halo interaction. | | Source: | arXiv, astro-ph/0008303 | | Services: | Forum | Review | PDF | Favorites | |
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