Troubleshooting guide

Filters: J, H, K, Ks, JH (0.9 μm – 1.8 μm), and HK (1.25 μm – 2.5 μm) bandpass filters.

Grisms: Two grisms are available, covering the JH (0.9 μm – 1.8 μm) and HK (1.25 μm – 2.5 μm) bandpasses.

The HK grism may be used with the HK filter to obtain H- and K-band spectra in first order, or it may be used

with the JH filter to obtain H-band in first order, and J-band in second order. For spectra in the K band only, the

K or Ks filter may be used to reduce the background.

Long Slits: 2, 3, 6, 9, 12, and 20 pixel wide slits are available; the 3 and 6 pixel slits cover much of the chip but

the others slits cover approximately two-thirds of the chip. All of these long slits are located on the MOS

wheel. An extra 3-pixel long slit is usually installed in one of the 11 MOS positions.

Spectral Characteristics

Filter / Grism

Combination

Band R = λ / δλ

(2 pix slit)

Dispersion

(Å /pixel)

R = λ / δλ

(3 pix slit)

JH + JH-grism J 1400 4.69 960

H 1800 4.69 1250

HK + HK-grism H 970 8.42 650

K 1300 8.42 865

JH + HK-grism J (2

order) 1500 4.4 1000

MOS Plates: Multiobject spectroscopy is not currently supported at the 2.1-m telescope. However, several

longslit masks can be installed in the MOS wheel, including a single long 3-pixel long slit and custom shorter

slits (2, 3, and 4-pixel wide; 2 arcmin long) with a central acquisition hole; 2 or 3 pixel wide slits are

customarily used at the 2.1-m telescope.

Position Angles: The 2.1-m guider is removed for the installation of FLAMINGOS, so the position angle of the

long slits is fixed at PA = 0º. Small rotational offsets of the long slits are possible to accommodate the small

residual offset of the instrument from a PA of exactly zero.

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 either of the MacMinis in the

control room (second-1 or second-2) to flmn-2m-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

. Flamingos1a is mounted on the right-hand electronics rack with the

instrument. A second machine, flamingos1b (flmn-2m-1b) previously mounted in the rack as a backup data

acquisition machine, is nonfunctional and has been removed.

1 Located in /usr/local/flamingos/, in the directories perl_all_tel/, perl_kp2m/, flamingos.headers.lut/, and

flamingos_modules/.

FLAMINGOS@2.1-m, Ver. 2.39, 2011 May 13 Page 4 of 46