Exposure Times
Imaging Flats Exposure Times
LUCI1&2 With N3.75 Camera.
|
LUCI1 Imaging Flats |
LUCI2 Imaging Flats |
| Filter |
Halo Lamp |
Counts [ADU/sec] |
NExp |
NDit |
Dit (sec) |
Halo Lamp |
Counts [ADU/sec] |
NExp |
NDit |
Dit (sec) |
| Br_gamma |
2 |
4650 |
5 |
2 |
2.51 |
2 |
4850 |
5 |
2 |
2.51 |
| OH_1060 |
2 |
950 |
5 |
2 |
10 |
2 |
650 |
5 |
2 |
13 |
| Y1 |
2 |
4900 |
5 |
2 |
2.51 |
2 |
3100 |
5 |
2 |
3 |
| Y2 |
2 |
6100 |
5 |
2 |
2.51 |
2 |
5000 |
5 |
2 |
2.51 |
| P_gam |
2 |
1240 |
5 |
2 |
8 |
2 |
810 |
5 |
2 |
10 |
| P_beta |
2 |
2200 |
5 |
2 |
4 |
2 |
1750 |
5 |
2 |
4.8 |
| J_low |
3 |
410 |
5 |
2 |
21 |
3 |
500 |
5 |
2 |
17 |
| J_high |
3 |
450 |
5 |
2 |
20 |
3 |
560 |
5 |
2 |
15 |
| OH_1190 |
2 |
1570 |
5 |
2 |
6.2 |
2 |
1130 |
5 |
2 |
7.5 |
| Fe II |
2 |
4600 |
5 |
2 |
2.51 |
2 |
4550 |
5 |
2 |
2.51 |
| H2 |
2 |
4800 |
5 |
2 |
2.51 |
2 |
4730 |
5 |
2 |
2.51 |
| HeI |
2 |
1520 |
5 |
2 |
6.6 |
2 |
1060 |
5 |
2 |
8 |
| J |
3 |
1130 |
5 |
2 |
8 |
3 |
1490 |
5 |
2 |
6 |
| Ks |
3 |
4250 |
5 |
3 |
2.51 |
3 |
5160 |
5 |
3 |
2.51 |
| z |
3 |
210 |
5 |
2 |
40 |
3 |
230 |
5 |
2 |
35 |
| H |
3 |
2130 |
5 |
2 |
4.2 |
3 |
2400 |
5 |
2 |
3.8 |
| K |
3 |
8100 |
5 |
3 |
2.51 |
3 |
10400 |
5 |
3 |
2.51 |
With N30 Camera, N30 Field Stop Mask
(**Times & count rated being determined):
|
LUCI1 Imaging Flats |
LUCI2 Imaging Flats |
| Filter |
Halo Lamp |
Counts [ADU/sec] |
NExp |
NDit |
Dit (sec) |
Halo Lamp |
Counts [ADU/sec] |
NExp |
NDit |
Dit (sec) |
| Br_gamma |
1 |
|
5 |
2 |
5.5 |
1 |
|
5 |
2 |
30 |
| OH_1060 |
1 |
|
5 |
|
|
1 |
|
5 |
|
|
| Y1 |
1 |
|
5 |
|
|
1 |
|
5 |
|
|
| Y2 |
1 |
|
5 |
|
|
1 |
|
5 |
|
|
| P_gam |
1 |
|
5 |
|
|
1 |
|
5 |
|
|
| P_beta |
1 |
|
5 |
|
|
1 |
|
5 |
|
|
| J_low |
2 |
|
5 |
|
|
2 |
|
5 |
|
|
| J_high |
2 |
|
5 |
|
|
2 |
|
5 |
|
|
| OH_1190 |
1 |
|
5 |
|
|
1 |
|
5 |
|
|
| Fe II |
1 |
|
5 |
3 |
4.5 |
1 |
|
5 |
2 |
35 |
| H2 |
1 |
|
5 |
2 |
4.5 |
1 |
|
5 |
2 |
27 |
| HeI |
1 |
|
5 |
3 |
12 |
1 |
|
5 |
2 |
120 |
| J |
2 |
|
5 |
2 |
15 |
1 |
|
5 |
2 |
3.5 |
| Ks |
2 |
|
5 |
2 |
12 |
1 |
|
5 |
2 |
2.8 |
| z |
1 |
3980 |
5 |
2 |
2.51 |
1 |
|
5 |
|
|
| H |
2 |
|
5 |
2 |
8.5 |
1 |
|
5 |
2 |
2.51 |
| K |
2 |
|
5 |
2 |
8.5 |
1 |
|
5 |
2 |
2.51 |
Spectral Flats Exposure Times
LUCI1&2 with N1.8 camera
NOTE: Exposure times for other slit widths scale inversely by the ratio of the slit widths (1″ slits should need half the time of 0.5″ slits) and also inversely as the square of the ratio of pixel scales (so flats with the N3.75 camera should take 4 times as long as the equivalent flats through the N1.8 camera).
|
LUCI1 Long-Slit |
LUCI2 Long-Slit |
| Filter |
Config |
CWL (um) |
Halo Lamp |
NExp |
NDit |
Dit (sec) |
Halo Lamp |
NExp |
NDit |
Dit (sec) |
| zJspec |
G200 N1.8 LS_1.00arcsec |
1.17 |
2 |
5 |
2 |
32 |
1 |
5 |
2 |
6.5 |
| HKspec |
G200 N1.8 LS_1.00arcsec |
1.93 |
2 |
5 |
2 |
8 |
2 |
5 |
2 |
6 |
| K |
G210 N1.8 LS_1.00arcsec |
2.2 |
2 |
5 |
2 |
20 |
1 |
5 |
2 |
5.5 |
| H |
G210 N1.8 LS_1.00arcsec |
1.65 |
2 |
5 |
2 |
30 |
1 |
5 |
2 |
7 |
| J |
G210 N1.8 LS_1.00arcsec |
1.25 |
2 |
5 |
2 |
2.51 |
1 |
5 |
2 |
16 |
| z |
G210 N1.8 LS_1.00arcsec |
0.96 |
1 |
5 |
3 |
6.3 |
|
|
|
|
| z |
G210 N1.8 LS_1.00arcsec |
1.0 |
|
|
|
|
1 |
5 |
2 |
60 |
| *For different slitwidths, divide the Dit by the slit width to obtain appropriate s/n, example: |
| zJspec |
G200 N1.8 LS_0.50arcsec |
1.17 |
1 |
5 |
2 |
2.51 |
1 |
5 |
4 |
13 |
| zJspec |
G200 N1.8 LS_2.0_1.5arcsec |
1.17 |
1 |
|
|
|
1 |
5 |
4 |
4.3 |
Arc Exposure Times
It should normally be enough to take a single arc lamp exposure for each lamp (Ar, Ne, Xe) needed, but 2-3 are OK.
NOTE: Recommended arc exposures times for the standard spectroscopic configurations (N1.8 camera, 0.5 slit width) are given below. The exposure times for other slit widths with a given grating or camera are about the same. Arc exposure times do not need to be scaled.
LUCI1 & 2 Arcs with N1.8 Camera
|
LUCI1 Arcs |
LUCI2 Arcs |
# lines |
| Filter |
Config |
CW (um) |
Lamp |
Dit |
Dit |
Peak |
| zJSpec |
G200 N1.8 LS_0.50arcsec |
1.25 |
Ne |
60 |
60 |
4400 |
~36 |
| Ar |
5 |
5 |
9350 |
~40 |
| zJspec |
G200 N1.8 LS_0.50arcsec |
1.17 |
Ne |
60 |
60 |
18000 |
~26 |
| Ar |
5 |
5 |
5300 |
~40 |
| HKspec |
G200 N1.8 LS_0.50arcsec |
1.93 |
Ne |
20 |
20 |
6600 |
20+ |
| Ar |
20 |
20 |
19000 |
~19 |
| Xe |
20 |
20 |
5500 |
~9 |
| HKspec |
G200 N1.8 LS_0.50arcsec |
1.98 |
Ne |
20 |
20 |
6200 |
20+ |
| Ar |
20 |
20 |
18300 |
~17 |
| Xe |
20 |
20 |
5200 |
~9 |
| K |
G210 N1.8 LS_0.50arcsec |
2.2 |
Ne |
60 |
60 |
2200 |
~10 |
| Ar |
60 |
60 |
4800 |
7+ |
| Xe |
60 |
60 |
3400 |
~3 |
| H |
G210 N1.8 LS_0.50arcsec |
1.65 |
Ar |
20 |
20 |
13000 |
~13 |
| Xe |
60 |
60 |
5600 |
7 |
| J |
G210 N1.8 LS_0.50arcsec |
1.25 |
Ar |
30 |
30 |
15400 |
~20 |
| Xe |
60 |
60 |
6700 |
~8 |
| J |
G210 N1.8 LS_0.50arcsec |
1.14 |
Ne |
60 |
60 |
12200 |
~13 |
| Ar |
30 |
30 |
4500 |
~13 |
| Xe |
60 |
60 |
2000 |
~12 |
| z |
G210 N1.8 LS_0.50arcsec |
0.96 |
Ar |
10 |
|
TBD |
TBD |
| Xe |
5 |
|
TBD |
TBD |
| z |
G210 N1.8 LS_0.50arcsec |
1 |
Ar |
|
10 |
TBD |
TBD |
| Xe |
|
5 |
TBD |
TBD |
