FORS grism page
FORS2 standard grisms
The following grisms form the Standard Instrument Configuration. Response curves are given in the User Manual.
|Grism name + ESO number||Lambda Central||Wavelength range||Dispersion||Order separation|
|GRIS_600B+22||465||330 - 621||50||none|
|GRIS_300V+10 (1)||590||330 - (660)||112||none|
|GRIS_300V+10||590||445 - 865||112||GG435|
|GRIS_300I+11||860||600 - 1100||108||OG590|
|GRIS_150I+27 (1)||720||330 - (650)||225||none|
|GRIS_150I+27 (1)||720||445 - (880)||230||GG435|
|GRIS_150I+27||720||600 - 1100||230||OG590|
|GRIS_1400V+18||520||456 - 586||20.8||none|
|GRIS_1200B+97||435||366 - 511||24.0||none|
|GRIS_1200R+93||650||575 - 731||25.0||GG435|
|GRIS_1028z+29||860||773 - 948||28.3||OG590|
|GRIS_600RI+19||678||512 - 845||55||GG435|
|GRIS_600z+23||901||737 - 1070||54||OG590|
|(1) If used without or with the listed order separation filter, the orders will overlap above the given wavelength.|
Identification of the arc linesPlease find a list of arc lines in the following table. There is noguaranty for the accuracy of the wavelengths. The optimum choice of lines will depend on the spectral resolution of the grisms and the data reduction method. In the long table for medium resolution grisms a preference column is included on the right hand side. Please have a look into the fitsheader for keyword INS.LAMP*.NAME and INS.LAMP*.TIME to see which lampsare on or off. In very rare cases broken lamps were not detected in time.
|low resolution||HeAr||down load|
|low resolution||HgCdHeAr||down load|
|medium resolution||HgCdHeNeAr||down load|
The following plots show the spectral line identification.The relative line strength maychange a lot since the switch on times for the lamps are changedfrom time to time. The 2nd order line identification plots are still tobe prepared.
Line identifications for FORS1 grisms (still with the old CCD) are given as well, to help with the reduction of old data.
|FORS1 Tek CCD
|FORS1 Tek CCD