Pull is so strong that hot gas is trapped

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Unformatted text preview: is used more loosely by astronomers to refer to baryons, electrons, atoms, cosmic rays and ions – all interact electromagne8cally •  Dark maOer we can only detect via _____ (so far) •  Other forms of maOer or energy – photons, neutrinos, magne8c fields – contribute a ___________ amount to the overall rest- mass energy of the Universe 5/14/13 UW, ASTR 323, SP13, Eric Agol ©2013 6 Dark maOer in clusters •  In rich clusters the gravita8onal pull is so strong that hot gas is trapped. Consequently, the dark maOer & baryon ra8os in rich clusters are about the _____ as the cosmological ra8o of dark maOer to baryons •  In rich, relaxed galaxy clusters, most of the gas is hot – at the virial temperature – such that the ________ due to microscopic mo8ons balances against gravity •  The mass in stars is typically small, so by measuring the...
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