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multi-object spectrograph

(multi-object spectrometer)
(device to record the spectrum of multiple targets simultaneously)

A multi-object spectrograph is a spectrograph designed to collect spectrographic data from multiple targets simultaneously. A spectrograph open to the image (i.e., no restricting slit) can do this (producing a little "rainbow" for each imaged star), but the term is generally used for newer variations.

Generally, it uses a method to bring in light from known locations within the telescope's focal plane image, and requires preparation in terms of adjusting the instrument for these specific locations. This has been done by using a mask with multiple slits rather than a single slit.

It has also been done using what amounts to an imaging spectrograph or integral field spectrograph but designed so the "pixels" can be placed so as to gather data from specific target locations rather than being spread evenly over a field. An integral field unit of the "fiber" type might have the fibers rearranged to certain points in the focal plane image.

Telescopes/instruments using this:

The term multi-object spectrography indicates observation with such instruments.

(color,EMR,instrument type,spectrography)

Referenced by:
Víctor M. Blanco Telescope
Dark Energy Spectroscopic Instrument (DESI)
European Extremely Large Telescope (E-ELT)
European Southern Observatory Very Large Telescope (ESO VLT)
fiber positioner
Gran Telescopio Canarias (GTC)
Hubble Space Telescope (HST)
Keck Observatory
Magellan Telescopes
Multi-object Optical and Near-IR Spectrograph (MOONS)
Subaru Telescope
Thirty Meter Telescope (TMT)
2dF-SDSS LRG and QSO survey (2SLAQ)
UK Schmidt Telescope (UKST)
Wide-field Multi-object Spectrograph (WFMOS)
William Herschel Telescope (WHT)