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Paper: Grand Rotation Curve, Dark Halo, and Baryon Fraction in the Milky Way Galaxy
Volume: 458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way
Page: 389
Authors: Sofue, Y.
Abstract: Grand rotation curve of the Milky Way Galaxy was constructed, which covers from the Galactic Center to Local Group (∼ 1 Mpc). Least-sq. fit by bulge, disk and NFW dark halo resulted Galactic parameters in table 1, leading to local dark matter density of ∼ 0.235 ± 0.030 GeV cm–3. We obtain stellar baryon fraction M(b+d) / M(b+d+h) = 0.072 ± 0.018, smaler than those in the universe (WMAP: 17%) or groups of galaxies (∼ 12%). Missing baryons (∼ 5%) may exist as hot gas of ∼ 106 K and EM ∼ 10–5 pc cm–6, sharing a small fraction of X-ray background.
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