The galactic constants and rotation curve from molecular-gas observations
The galactic constants and rotation curve from molecular-gas observations
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DOI：
10.1134/1.1941484
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发表时间：
2005-06
影响因子：
1
通讯作者：
V. Avedisova
中科院分区：
文献类型：
--
作者：
V. Avedisova
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 beR0= 8.01 ± 0.44 kpc. Estimates ofR0derived over the last decade are summarized and discussed; the average value isR0= 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 forR0= 8.0 kpc and Θ0= 200 km/s.
