The dust polarisation and magnetic field structure in the centre of NGC253 with ALMA

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Volume 697 (May 2025)

A&A, 697 (2025) A24

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Table B.1.

SED-fitting results for the different regions analysed in Band 7 and Band 4.

Measured Values			Fit results with α_ff = 0.118, T_d = 30 K and α_syn = [ − 0.45, −0.75]

			Band 7			Band 4
Region	PF_meas.,Band7[%]	PF_meas.,Band4[%]	I_dust/I_tot	I_syn/I_tot	I_ff/I_tot	I_dust/I_tot	I_syn/I_tot	I_ff/I_tot	β_d	χ_red²	PF_dust[%]	PF_syn[%]	$\frac{P F_{syn}}{P F_{dust}}$ $\frac{PF_{syn}}{PF_{dust}}$
SA	0.31	0.55	[0.89, 0.91]	[0.03, 0.01]	[0.08, 0.08]	[0.22, 0.32]	[0.26, 0.14]	[0.51, 0.55]	[1.71, 1.36]	[0.10, 0.07]	[0.25, 0.27]	[1.78, 3.44]	[7.2, 12.7]

SC	0.10	0.17	[0.80, 0.82]	[0.04, 0.01]	[0.16, 0.17]	[0.06, 0.13]	[0.21, 0.08]	[0.73, 0.79]	[2.62, 1.84]	[0.03, 0.04]	[0.08, 0.09]	[0.83, 2.37]	[11.0, 26.8]

SO	0.32	0.58	[0.91, 0.93]	[0.03, 0.01]	[0.06, 0.06]	[0.31, 0.42]	[0.29, 0.16]	[0.40, 0.42]	[1.45, 1.15]	[0.12, 0.09]	[0.27, 0.29]	[1.78, 3.29]	[6.6, 11.3]

PI_E	0.29	0.44	[0.90, 0.91]	[0.02, 0.01]	[0.08, 0.08]	[0.26, 0.34]	[0.21, 0.10]	[0.54, 0.56]	[1.65, 1.38]	[0.08, 0.05]	[0.29, 0.31]	[1.65, 3.36]	[5.7, 11.0]

PI_S	0.30	0.60	[0.77, 0.79]	[0.04, 0.01]	[0.19, 0.20]	[0.04, 0.08]	[0.20, 0.11]	[0.76, 0.81]	[2.90, 2.17]	[0.07, 0.05]	[0.27, 0.32]	[2.86, 5.60]	[10.5, 17.7]

PI_W	0.47	0.70	[0.94, 0.95]	[0.01, 0.01]	[0.04, 0.04]	[0.41, 0.49]	[0.19, 0.10]	[0.40, 0.42]	[1.56, 1.39]	[0.11, 0.08]	[0.44, 0.46]	[3.71, 7.37]	[8.5, 16.1]

Notes. For each band, the actual PF_meas. values measured from the data are reported in bold in the columns 2-3, while the columns 4-9 report the range of values of the relative contribution of dust, synchrotron, and free-free to the total intensity. These values are obtained from the SED-fitting, assuming as synchrotron spectral α_syn the values α_syn = 0.45 and α_syn = 0.75. Column 10 reports the resulting fitted value of the emissivity index β_d, while column 11 reports the range of values of the reduced χ² of the fits. The dust polarisation fraction PF_dust and the synchrotron polarisation fraction PF_syn derived (see Section 4 for more details) are reported in the columns 12 and 13. The last column report the ratio of the derived polarisation fractions of the synchrotron and dust components. The regions in the first column are described in details in Section 4 and indicated in Figure 7.

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