Subject: Re: NGST IFS-MOS trade-off for AWG Date: Fri, 29 Jan 1999 15:06:23 +0100 (MET) From: Guenther Hasinger To: rfosbury@eso.org CC: grh@aip.de (Guenther Hasinger) Dear Bob, sounds very good. I would like to emphasize in addition the aspect of serendipity observations with IFS, e.g. emission line objects which happen to be in the FOV by chance and would be missed completely by MOS. Also objects spatially related to the target (e.g. the Ly-alpha clouds) are immediately showing up. We her at Potsdam have some concern about the extremely dense packing of Fibers in the integral field units in terms of straylight and mode separation. We are currently building an integral field spectrophotometer which is geared to high cleanliness but salvaging Field-of-view. Is it o.k. if I discuss the tradeoffs with my specialists here and bring that as an input into the process? Best regards, yours sincerely. Guenther Subject: Re: NGST IFS-MOS trade-off for AWG Date: Fri, 29 Jan 1999 16:20:28 +0100 From: R A E Fosbury Organization: ST-ECF To: Guenther Hasinger Dear Guenther, > > I would like to emphasize in addition the aspect of serendipity observations > with IFS, e.g. emission line objects which happen to be in the FOV by chance > and would be missed completely by MOS. Also objects spatially related > to the target (e.g. the Ly-alpha clouds) are immediately showing up. > yes, absolutely.... > We her at Potsdam have some concern about the extremely dense packing of > Fibers in the integral field units in terms of straylight and mode > separation. We are currently building an integral field spectrophotometer > which is geared to high cleanliness but salvaging Field-of-view. Is it o.k. > if I discuss the tradeoffs with my specialists here and bring that as an > input into the process? yes, please do. How much have you seen of the LAS/Dornier designs? I guess a lot of it is on the web - although it may be protected... Bob By the way, the favourite LAS design is a "3D"-like slicer - no fibres...