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FLAMINGOS-2 is a near-infrared imaging spectrograph at Gemini-South, offering observations in the 1.0-2.4 μm wavelength range in a 6.1 arcmin circular field of view. Currently, imaging and long-slit spectroscopy modes are offered, while the multi-object spectroscopy mode is awaiting its commissioning.

FLAMINGOS-2 was originally built by the University of Florida Astronomy Department and delivered to Gemini in July 2009, where it underwent a series of refurbishments and commissioning runs. It has been in regular queue operation mode since semester 2013B.

Performance overview: Imaging

The intrinsic point spread function of FLAMINGOS-2 has a FWHM of 0.36 arcsec across the full field (see image quality). These values are also reached in good seeing conditions on sky, in particular in K-band. The on-axis plate scale is 0.1792 arcsec / pixel, meaning FLAMINGOS-2 becomes critically sampled in very good seeing conditions. Currently, observations can be made in J, H, Ks broand-band filters as well as two medium-band filters that split the K-band in two. More filters are available, but they are not installed in FLAMINGOS-2 at all times.

Performance overview: Long-slit spectroscopy

FLAMINGOS-2 offers two low resolution grisms (R~900) covering the JH and HK spectral ranges, respectively. The medium resolution grism covers the J, H, K bandpasses separately (R~2600). The spectral resolution is a strong function of slit width and wavelength for all grisms, reaching its maximum near the center of the respective bandpass. Details can be found at the grisms web page.

The instrument scientist for FLAMINGOS-2 is Ruben Diaz, with support from Mischa Schirmer and Karlyne Silva.


Sculptor Galaxy NGC 253, as seen by FLAMINGOS-2 in JHK filters

Fig.: NGC 253, observed in JHK filters. The cutout on the upper right is caused by vignetting due to the guide probe arm. The image seeing is about 0.7 arcsec.