| |
 |
| 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. |
|
|
|
|
|
