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Table 6

Slit-dependent quality of the telluric absorption correction of NIR-arm X-Shooter spectra.

Slit N FWHMa Ioff Ires
[′′] [pixels]
Mean σ Mean σ Mean σ

0.4 437 2.49 0.20 + 0.008 0.059 0.239 0.069
0.6 711 3.07 0.31 −0.002 0.020 0.199 0.047
0.9 1927 3.95 0.74 −0.012 0.027 0.193 0.064
1.2 566 4.44 1.01 −0.015 0.024 0.179 0.056
1.5 148 5.03 1.62 −0.020 0.020 0.158 0.059
5.0 48 5.41 1.57 −0.057 0.025 0.156 0.066

Notes.

(a)

Since the FWHM in pixels depends on the wavelength for a nearly constant spectral resolution, the FWHM is given for the centre of the full NIR-arm wavelength range, i.e. 1.74 μm (see also Sect. 4.1). For spectra taken with a K-blocking filter, which only extend up to 2.1 μm, the FWHM was corrected to be also representative of 1.74 μm.

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