Measurement of the extragalactic background light at 8600 Å using dark cloud shadow and the Ca II-triplet lines

Open Access

Table 1.

The FORS2 instrumental set-up.

Telescope/Instrument	VLT-UT1/FORS2
mode	LSS
Grism	GRIS_1028z
Filter	OG590
Spectral resolution	9.0 ÅFWHM
Detector	2× MIT
Size	2× (2048 × 1024)^a
LSS slit width	2 $\overset{″}{.}$ $\overset{\prime \prime }{.}$ 5
LSS slit length	6 $\overset{'}{.}$ $\overset{\prime }{.}$ 8
LSS position angle	8°
Spatial scale	0 $\overset{″}{.}$ $\overset{\prime \prime }{.}$ 25/pixel^a
Dispersion	0.84 Å/pixel^a
Wavelength range	7900 Å–9500 Å

Notes.

^(a)

After binning the CCDs by 2 × 2.

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