News
This Month
Introduction
Gallery
Science
Observing
Information
Site Map
|
COMICS medium-resolution N-band spectroscopy
The medium-resolution N-band grating provides a resolution of
2500 (0.33'' slit) and a dispersion of 0.002 um/pixel. The
spectrum is dispersed onto all 5 of the COMICS spectrograph's detectors,
with large gaps between them. The grating tilt can be selected to vary the
wavelength regions which fall on the detectors, or the entire N-band
(7.8-13.3 um) can be covered in two standard grating positions. Note
that the wavelength axis is tilted with respect to the detector columns, by
about 20-30 pixels (~0.05 um) over the entire length of the slit.
Detectors |
1 |
|
2 |
|
3 |
|
4 |
|
5 |
Coverage (um) |
0.63 | |
0.62 | |
0.61 | |
0.60 | |
0.59 |
| 0.49 |
| 0.48 |
| 0.47 |
| 0.46 |
The point-source sensitivity of the NM grating varies with
wavelength and is shown in the following figure (1 sigma for
1 second of on-source integration time).
|