A new dust map of the Milky Way - I. Principal features

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Table 2

Tangencies of the spiral arms as determined from the extinction map.

Spiral arm	l_min	l_max	d_min	d_max	Tangent
Norma (Q1)	20.5^°	25.5^°	5.0	7.5	23.1 ± 1.1^°
Norma (Q4)	–33.0^°	–30.0^°	8.0	9.0	−31.1 ± 1.6^°
Scutum	29.0^°	33.0^°	3.0	7.0	30.5 ± 0.8^°
Crux	–50.9^°	–49.1^°	3.5	9.0	−48.1 ± 1.8^°
Sagittarius	48.8^°	51.2^°	2.0	5.0	50.5 ± 0.9^°
Carina	–78.4^°	–73.6^°	2.0	5.0	−76.0 ± 1.4^°

Notes. The quoted value is the mean of the tangent position weighted by the dust density, while the uncertainty corresponds to the weighted standard deviation.

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