X-shooter
User Manual
Doc:
Issue
Date
Page
VLT-MAN-ESO-12000-0115
1
01.03.2009
12 of 61
ESO, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
•
one free position for a direct feed from the telescope,
•
one mirror which reflects the light from the integrating equipped with:
o
wavelength calibration Ar, Hg, Ne and Xe Penray lamps operating
simultaneously
o
three flatfield halogen lamps equipped with different balancing filters to
optimize the spectral energy distribution for each arm
•
one mirror which reflects light from:
o
a wavelength calibration hollow cathode Th-Ar lamp
o
a D
2
lamp for flatfielding the bluest part of the UV-Blue spectral range
A more detailed description of the functionalities of the calibration system is given in Section
4.
The Acquisition and Guiding slide.
Light coming either directly from the telescope or from the Calibration Unit described above
reaches first the A&G slide. This structure allows to put into the beam either:
•
a flat 45˚ mirror with 3 positions mirror:
o
acquisition and imaging
: send the full 1.5’
×
1.5’ field of view to the A&G
camera. This is the position used during all acquisition sequences;
o
spectroscopic observations and monitoring
: a slot lets the central 10”
×
15” of
the field go through to the spectrographs while reflecting the peripheral field to
the A&G camera. This is the position used for all science observations.
o
artificial star
: a 0.5” pinhole used for optical alignment and engineering
purposes;
•
the IFU (described below on page 13);
•
a 50/50 pellicle beam splitter at 45˚ used look down into the instrument with the A&G
camera and is exclusively used for engineering purposes.
