BATMAN: a DMD-based multi-object spectrograph on Galileo telescope
2014
Next-generation infrared astronomical instrumentation for ground-based and space telescopes could be based on
MOEMS programmable slit masks for multi-object spectroscopy (MOS). This astronomical technique is used
extensively to investigate the formation and evolution of galaxies.
We are developing a 2048x1080 Digital-Micromirror-Device-based (DMD) MOS instrument to be mounted on the
Galileo telescope and called BATMAN. A two-arm instrument has been designed for providing in parallel imaging and
spectroscopic capabilities. The field of view (FOV) is 6.8 arcmin x 3.6 arcmin with a plate scale of 0.2 arcsec per
micromirror. The wavelength range is in the visible and the spectral resolution is R=560 for 1 arcsec object (typical slit
size). The two arms will have 2k x 4k CCD detectors.
ROBIN, a BATMAN demonstrator, has been designed, realized and integrated. It permits to determine the instrument
integration procedure, including optics and mechanics integration, alignment procedure and optical quality. First images
and spectra have been obtained and measured: typical spot diameters are within 1.5 detector pixels, and spectra generated
by one micro-mirror slits are displayed with this optical quality over the whole visible wavelength range. Observation
strategies are studied and demonstrated for the scientific optimization strategy over the whole FOV.
BATMAN on the sky is of prime importance for characterizing the actual performance of this new family of MOS
instruments, as well as investigating the operational procedures on astronomical objects. This instrument will be placed
on the Telescopio Nazionale Galileo mid-2015.
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