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Q&A: Galaxies, Galaxy Clusters, AGN, and Quasars
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Q:
When we say a halo of hot gas, what does that mean to me when I
fly close to the galaxy and through the "Hot Gas Halo"? Do I get
vaporized by the heat or will I notice it at all?
A:
 You would not notice
it at all. As those motivational gurus who teach you to walk on
coals know, the key to not burning your feet is the rate of heat
transfer. In the halos of hot gas around galaxies, the gas is so
rarified that the heat transfer to a spaceship would be
practically nil. Chandra can detect the X-rays from these halos
because they are tens of thousands of light years across.
(Photo: Jeff Werner, www.firewalking.com)
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