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Table 5

ZIMPOL Hα filter parameters for the filter B_Ha, N_Ha (FW0 and FW2) and CntHa.

Value [unit] B_Ha N_Ha N_Ha CntHa
(FW0) (FW2)

λc [nm] 655.6 656.34 656.53 644.9
FWHM [nm] 5.5 1.15 0.97 4.1
T peak 0.89 0.76 0.70 0.87
Δλ [nm] 5.35 0.81 0.75 3.83
7.2 8.4 9.2 ...
(± 0.4)
1.20 9.3 10.0 1.59
(± 0.05) (± 0.5) (± 0.5) (± 0.05)

Notes. Filter parameters are central wavelength λc, full width at half maximum (FWHM), peak filter transmission Tpeak, filter equivalent width Δλ = T(λ) dλ, photometric zero points for the Hα line emission at λc in units of 10-16 erg/(cm2 ct) and for the continuum emission in units of 10-17 erg/(cm2 Å ct). The uncertainties for for N_Ha filters consider also Hα wavelength shifts of ± 0.3 nm from λair(Hα).

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