Whats the LWS sensitivity in spectroscopic observing modes?
A flux of 150 mJy in LRES (R=100) mode, or 500-1000 mJy in HRES (R=1200) mode, yields S/N=1 per spectroscopic resolution element in 1 second on source. The LRES estimate assumes you are using: • the small (3 pixel = 0.25 arcsec) slit; • the low-resolution grating; • the broadband “N” (8-13 µm) filter; • central wavelength of 10 µm; • chop-nod observing mode. Quoted flux is light incident on telescope. Also see the next item…
