Troubleshooting guide
Spectral Characteristics
Filter / Grism
Combination
Band
R = λ/ δλ
(2 pix slit)
Dispersion
(Å/pixel)
R = λ / δλ
(3 pix slit)
JH-bandpass +
JH-grism J 1400 4.68 960
H 1800 4.68 1250
HK-bandpass +
HK-grism
H
970 8.55 650
K 1300 8.55 865
JH-bandpass +
HK-grism J (2
nd
order) 1500 4.4 1000
MOS Plates: 11 positions are available for MOS plates; at present 1 position is occupied by a MOS plate
shaped single long slit with width of 3 pixels; 3 pixel wide slits are customarily used at the 4-m telescope.
The masks cover approximately ±290 pixels of the chip in the dispersion direction.
The science grade array is offset in the spatial direction with respect to the MOS wheel field of view, which
essentially means that the lower ~70 pixels of a MOS plate will not hit the detector. Lower in this case means
the 70 pixels furthest North if the position angle (PA) is 0º, the 70 pixels furthest East if the PA is 90º, and the
70 pixels furthest South if the PA is 180º. See also Appendix 4: Additional Notes on MOS plates.
Position Angles: The position angle of the long slits and MOS plates matches that of the telescope instrument
rotator. The allowed range is -0.6º to +180º. Small rotational offsets of the long slits and MOS plates are
possible, and required, as the rotator positioning is too coarse for accurate slit positioning.
Mechanisms: The MOS dewar contains the Decker and MOS wheels; the Decker wheel contains an imaging
hole, a psuedo dark, and aperture masks to baffle stray light before the MOS wheel. The Camera dewar contains
the Filter, Lyot, and Grism wheels; the Lyot wheel contains Lyot stops for the KPNO 2.1-m and 4-m telescopes,
and for the MMT; the Grism wheel contains the two grisms, two imaging apertures, and the only truly dark cold
stop in the system.
Instrument Control: FLAMINGOS is operated via an ssh connection from tan to flmn-4m-1a (hereafter
referred to as flamingos1a), which is the primary FLAMINGOS control computer. FLAMINGOS is set up so
that all data taking is run from the command line of flamingos1a using a set of perl scripts
1
. Flamingos1a is
mounted on the right-hand electronics rack with the instrument, in the Cassegrain cage. A second machine,
flamingos1b (flmn-4m-1b) is in the rack as a backup data acquisition machine, and is generally turned off.
Data Acquisition & Storage: While you are taking data, all data will be located on flamingos1a in
/data/4mguest/<UTDATE>/. If you type df -h, you can see how much of the 68 GB disk space is
available; similarly if you type du -h, you can see how much disk space is used in the present directory (the
1 Located in /usr/local/flamingos/, in the directories perl_all_tel/, perl_kp4m/,
flamingos.headers.lut/, and flamingos_modules/.
FLAMINGOS@4-m, Ver. 2.34, 2006 Apr 04 Page 4 of 44