Constraints from Faraday rotation on the magnetic field structure in the Galactic halo

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Table 2

List of the 6 best models of the total (antisymmetric halo + symmetric disk) magnetic field.

Model^a

Fixed parameters^b

Best-fit free parameters^b

r₁ [kpc]

| z₁ | [kpc]

B₁ [μG]

H [kpc]

L [kpc] ^c

ϕ_⋆ [deg]

a [kpc^-2]

p₀ [deg]

H_p [kpc] ^d

L_p [kpc] ^e

>18

2.37

Ad1

>16

2.42

Bd1

>22

2.26

Dd1

1.5

0.5

>38

2.02

Ad1

> 38

2.02

Bd1

> 30

2.08

Dd1

1.5

0.5

Notes.

^(a)

For each total-field model, the first line refers to the antisymmetric halo field and the second line to the symmetric disk field. Models C0 and C1 are the axisymmetric (m = 0) and bisymmetric (m = 1) versions of model C, described in Sect. 3.1, while models Ad1, Bd1, and Dd1 are the bisymmetric versions of models Ad, Bd, and Dd, described in Sect. 3.2.

^(b)

The meaning of the different parameters is reminded in Table 1.

^(c)

When the 1σ upper confidence limit of L is ≫ L_e, it cannot be determined with any accuracy, so it is replaced by ∞.

^(d)

When the best-fit value of H_p is ≫ H_e, it cannot be determined with any accuracy, so only an approximate 1σ lower limit is provided.

^(e)

In all models, the best-fit value of L_p is ≫ L_e, so it cannot be determined with any accuracy, and only an approximate 1σ lower limit is provided.

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