Does anyone have a reliable reference for the x-ray mass of the Coma Cluster? I've got a value of $3\times10^{13}\: M_⊙$ from Gursky's 1971 report. Anything more recent would be appreciated.
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$\begingroup$ Possibly better for Astronomy SE? $\endgroup$– BowlOfRedCommented Oct 5, 2015 at 22:33
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$\begingroup$ I don't think so, Red, this is all related to Cosmology; these values go into testing models such as LCDM and MOND. $\endgroup$– user32023Commented Oct 6, 2015 at 1:30
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Gas mass $(5.5 \pm 0.6) \times 10^{14} (H_0/50)^{-5/2} M_{\odot}$ within $5(H_0/50)^{-1}$ Mpc, where $H_0$ is the Hubble parameter in km/s per Mpc - Hughes (1989).
Or $(5.1 \pm 1.5) \times 10^{14} (H_0/50)^{-5/2} M_{\odot}$ within $5(H_0/50)^{-1}$ Mpc - Briel et al. (1992).
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$\begingroup$ Many thanks. I'm surprised there's not a more recent estimate though. Found lots of data for small clusters, but not this one. $\endgroup$– user32023Commented Oct 6, 2015 at 0:45
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$\begingroup$ @DonaldRoyAirey The more recent X-ray satellites have smaller fields of view. $\endgroup$– ProfRobCommented Oct 6, 2015 at 6:00
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$\begingroup$ Sorry, I just noticed this part. Are you saying I need to take the value 5.1 e14 kg and multiply it by (70.5/50)^(5/2) to get the right mass within 5 *(70.5/50) Mpc? $\endgroup$– user32023Commented Oct 6, 2015 at 22:37
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$\begingroup$ Just to be clear. The conclusion of Briel et al (1992) is that the mass of gas within 5 / (70.5/5) = 3.55 Mpc is (5.1e14 * (70.5/5)) 1.2 e15 kg? $\endgroup$– user32023Commented Oct 6, 2015 at 22:49
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$\begingroup$ @DonaldRoyAirey The indices are -5/2 and -1. For H=70.5, it is a mass of 2.16e14 solar masses(!) within 3.55 Mpc. $\endgroup$– ProfRobCommented Oct 6, 2015 at 23:38