Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005arep...49..435a&link_type=abstract
Astronomy Reports, vol. 49, Issue 6, p.435-445
Astronomy and Astrophysics
Astronomy
12
Scientific paper
We obtained the photometric distances and radial velocities for the molecular gas for 270 star-forming regions and estimated the distance to the Galactic center from ten tangent points to be R 0 = 8.01 ± 0.44 kpc. Estimates of R 0 derived over the last decade are summarized and discussed; the average value is R 0 = 7.80 ± 0.33 kpc. We analyze deviations from axial symmetry of the gas motion around the Galactic center in the solar neighborhood. Assuming a flat rotation curve, we obtain Θ0 ˜ 200 km/s for the circular velocity of the Sun from regions beyond the Perseus arm. We used these Galactic constants to construct the Galactic rotation curve. This rotation curve is flat along virtually its total extent from the central bar to the periphery. The velocity jump in the corotation region of the central bar in the first quadrant is 20 km/s. We present analytical formulas for the rotation curves of the Northern and Southern hemispheres of the Galaxy for R 0 = 8.0 kpc and Θ0 = 200 km/s.
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