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VIMOS User Manual
VLT-MAN-ESO-14610-3509
Table 2.7: Spectral coverage ∆λ for three positions of the slit in field of view (MOS mode)
Grism
LR red
LR blue
MR
HR blueN EW
HR blueOLD 1
HR red
HR orange
1
Order sorting
filter
OS-red
OS-blue
GG475
Free
Free
GG475
GG435
∆λ
CCD center
550 - 950 nm
360 - 670 nm
500 - 1000 nm
370 - 524 nm
370 - 552 nm
630 - 870 nm
520 - 760 nm
∆λ
CCD bottom
550 - 950 nm
360 - 670 nm
500 - 1000 nm
370 - 607 nm
468 - 674 nm
690 - 930 nm
577 - 817 nm
∆λ
CCD top
550 - 950 nm
360 - 670 nm
500 - 950 nm
370 - 441 nm
370 - 566 nm
570 - 805 nm
463 - 703 nm
HR blueOLD not available after March 2012. Info given for reference.
Figure 2.5: Orientation of the VIMOS IFU field of view on sky for position angles 0◦ and 90◦ , in IFU mode.
2.4.1
IFU mode: orientation of the field of view
Figure 2.5 shows the orientation of the instrument field of view in IFU mode for the four quadrants. On
the detectors, wavelength dispersion is along the y axis, with wavelength increasing with y. The increasing
position angle on the sky (east of north) corresponds to the positive rotator angle. Spatial characteristics are
described in the Section below.
As for IMG/MOS modes, the pointing coordinates in the header correspond to the center of the VIMOS
field of view. Due to offset position of IFU with respect to the center, the relevant header keywords which
contain the information of the pointing of the IFU are ”HIERARCH ESO TEL TARG ALPHA” and ”HIERARCH ESO TEL TARG DELTA”. Notice that these are the target coordinates, if there are large offsets during
the execution of the OB these coordinates will not change.
2.4.2
Fiber arrangement and spatial characteristics
The special arrangement of fibers for VIMOS IFU head is shown in Fig. 2.6. The fibers numbering has been
arranged following the scheme: mask - line - module -fiber (i.e. 4 - B - 5 - 67). The arrangement of the fibers
into the 4 pseudo-slits mask (one for each channel) is reported in Fig. 2.7. The detailed IFU table is distributed