The Mid-Infrared Instrument for the James Webb Space Telescope, VI: The Medium Resolution Spectrometer
Journal article, 2015

We describe the design and performance of the Medium Resolution Spectrometer (MRS) for the JWST-MIRI instrument. The MRS incorporates four coaxial spectral channels in a compact opto-mechanical layout that generates spectral images over fields of view up to 7.7 x 7.7 '' in extent and at spectral resolving powers ranging from 1300 to 3700. Each channel includes an all-reflective integral field unit (IFU): an "image slicer" that reformats the input field for presentation to a grating spectrometer. Two 1024 x 1024 focal plane detector arrays record the output spectral images with an instantaneous spectral coverage of approximately one third of the full wavelength range of each channel. The full 5-28.5 mu m spectrum is then obtained by making three exposures using gratings and pass-band-determining filters that are selected using just two three-position mechanisms. The expected on-orbit optical performance is presented, based on testing of the MIRI Flight Model and including spectral and spatial coverage and resolution. The point spread function of the reconstructed images is shown to be diffraction limited and the optical transmission is shown to be consistent with the design expectations.

Temperature

Rmany

Thermal-Expansion Measurements

Optical Materials

Author

M. Wells

Royal Observatory

J. W. Pel

University of Groningen

A. Glasse

Royal Observatory

G. S. Wright

Royal Observatory

G. Aitink-Kroes

R. Azzollini

Dublin Institute for Advanced Studies

Centro de Astrobiologia (CAB)

S. Beard

Royal Observatory

B. R. Brandl

Leiden University

A. Gallie

Royal Observatory

V. C. Geers

Dublin Institute for Advanced Studies

A. M. Glauser

Swiss Federal Institute of Technology in Zürich (ETH)

P. Hastings

Royal Observatory

T. Henning

Max Planck Institute

R. Jager

Kay Justtanont

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

B. Kruizinga

Netherlands Organisation for Applied Scientific Research (TNO)

F. Lahuis

Leiden University

Netherlands Institute for Space Research (SRON)

D. Lee

Royal Observatory

I. Martinez-Delgado

Centro de Astrobiologia (CAB)

J. R. Martinez-Galarza

Leiden University

Harvard-Smithsonian Center for Astrophysics

M. Meijers

J. E. Morrison

University of Arizona

F. Muller

Max Planck Institute

T. Nakos

Ghent university

B. O'Sullivan

PO3 5PU

A. Oudenhuysen

P. Parr-Burman

Royal Observatory

E. Pauwels

R. R. Rohloff

Max Planck Institute

E. Schmalzl

Leiden University

J. Sykes

University Of Leicester

M. P. Thelen

Jet Propulsion Laboratory, California Institute of Technology

E. F. van Dishoeck

Leiden University

B. Vandenbussche

KU Leuven

L. B. Venema

H. Visser

Netherlands Organisation for Applied Scientific Research (TNO)

Lbfm Waters

Netherlands Institute for Space Research (SRON)

University of Amsterdam

D. Wright

Publications of the Astronomical Society of the Pacific

0004-6280 (ISSN) 1538-3873 (eISSN)

Vol. 127 953 646-664

Subject Categories

Astronomy, Astrophysics and Cosmology

Infrastructure

Onsala Space Observatory

More information

Latest update

5/29/2018