Using classical Cepheids to study the far side of the Milky Way disk - II. The spiral structure in the first and fourth Galactic quadrants

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Volume 654 (October 2021)

A&A, 654 (2021) A138

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Table 1.

Spiral arm characteristics and log-periodic model parameters.

Arm	β_ref	R_ref	ψ	ℓ tangency ^(b)
	[°]	[kpc]	[°]	[°]
Sct-Cen	23	5.10	12.90	305.5, 311.2
Sgr-Car	40	6.00	12.70	283.8
Perseus	40	9.10	9.45	328.1 ^(*)
Outer	18	12.20	10.50, 7.40 ^(a)	–

Notes.

^(a)

For this arm we allowed for a kink with pitch angles 10.5 and 7.4 for azimuths β ≤ β_ref and β > β_ref, respectively.

^(b)

Tangency direction in the fourth Galactic quadrant taken from Hou & Han (2015). Two peaks are reported in the Centaurus arm tangency direction. The one at 305.5° is associated with the Sct-Cen arm, while for the second peak at 311.2° our data suggests it might be linked to the Outer arm.

^(*)

We propose the Norma tangency direction to be associated with the Perseus arm.

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