User`s guide

FLAMINGOS at the MMT
I. FLAMINGOS+MMT Overview
FLAMINGOS is the FLoridA Multi-object Imaging Near-ir Grism Observational Spectrometer. This manual
attempts to provide the user with a good portion of the tools needed to successfully take data with FLAMINGOS
at the MMT. A knowledge of basic unix commands is assumed.
FLAMINGOS is comprised of 2 cryogenic dewars. The Mos dewar, closest to the telescope backplane contains
a wheel which can position one of 11 different slit plates into the cassegrain focal plane. The Camera dewar,
immediately following the Mos dewar contains all of the powered optics, filters, stops, grisms, and the detector
array.
Array: Hawaii II 2048x2048 HgCdTe science grade array, divided into four quadrants with 8
amplifiers each (32 amplifiers for the whole array).
Linearity: Using a bias voltage of 1.0V, the array is
0.5% non-linear at 25,000 counts
2% non-linear at 35,000 counts
>3% non-linear at 40,000 counts
Plate Scale and Field of View:
0.169"/pixel
5.76 arcminute FOV
Detector Characteristics:
Bias Voltage (Volts) 1.0 0.75
Full Well (ADU) ~50,000 ~38,000
Target Count level (ADU) 25,000 – 35,000 25,000 – 30,000
Read Noise (e) 50 50.0
Gain (e / ADU) ~4.9 ~4.5
Filters: J, H, K, Ks, JH, and HK bandpass filters.
Grisms: JH, and HK bandpass coverage. 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.
Long Slits: 2, 3, 6, 9, 12, and 20-pixel slits are available; the 3 and 6 pixel slits cover much of the chip. All of
the long slits are located on the Mos wheel.
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