The spiral structure of our Milky Way Galaxy | Astronomy & Astrophysics (A&A)

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Table 1:

The parameters of the best fitting models: the initial radius, R_i, the start azimuthal angle, $\theta _{i}$ , and the pitch angle, $\psiup _{i}$ , for the ith arm.
Model	R₁	$\theta_{1}$	$\psiup_{1}$	R₂	$\theta_{2}$	$\psiup_{2}$	R₃	$\theta_{3}$	$\psiup_{3}$	R₄	$\theta_{4}$	$\psiup_{4}$	Z
	(kpc)	$(^{\circ})$	$(^{\circ})$	(kpc)	$(^{\circ})$	$(^{\circ})$	(kpc)	$(^{\circ})$	$(^{\circ})$	$(^{\circ})$	$(^{\circ})$	(kpc)
For distribution of tracers with R₀=8.5 kpc and $\Theta _0=220$ km s^-1
2-arm model	4.2	147	5.3	4.0	297	5.2							0.47
3-arm model	3.8	40	7.8	3.6	195	9.9	4.0	303	7.5				0.45
4-arm model	3.7	40	9.6	4.5	205	10.7	4.4	290	11.4	3.9	309	8.7	0.35
For distribution of tracers with R₀=8.0 kpc and $\Theta _0=220$ km s^-1
2-arm model	4.0	151	5.1	3.9	315	5.0							0.43
3-arm model	3.6	40	8.0	3.5	195	9.6	3.9	303	7.4				0.41
4-arm model	3.6	40	9.2	3.7	205	12.5	4.2	290	11.1	3.8	309	8.4	0.33

Source LaTeX | All tables | In the text

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