Near Infrared Spectrograph

The JWST Near Infrared Spectrograph (NIRSpec) enables 0.6–5.3 μm spectroscopy at resolving powers of ~100, ~1,000, and ~2,700 in four observing modes. NIRSpec is designed to be particularly powerful for multiplexing spectroscopy and high contrast, high throughput single-object spectroscopy. 

Key science uses of NIRSpec include, but are not limited to: statistical survey spectroscopy for galaxy formation and evolution studies, characterization of stellar populations, spatially resolved spectroscopy of extended targets, and characterization of exoplanet atmospheres using transit observations.

The four observing modes of NIRSpec are:

Each mode in NIRSpec has its own planning interface template in the Astronomer's Proposal Tool (APT) software. Follow the links below to access the documentation for each of the observing modes:

Information about calibration is available at JWST Calibration Programs and Data. This article and its links point to content about absolute astrometricflux, and wavelength calibration, as well as information on calibration reference files.

Details about the data can be found in the Understanding Data Files article. The JWST pipeline is described in JWST Data Reduction Pipeline and some information about post-pipeline processing can be found at JWST Post-Pipeline Data Analysis.

Contributors to NIRSpec article content include:  Catarina Alves de Oliveira, Tracy Beck, Stephan Birkmann, Torsten Boeker, Anurag Deshpande, Pierre Ferruit, Giovana Giardino, Alaina Henry, Graham Kanarek, Diane Karakla, Susan Kassin, Tony Keyes, Nora Luetzgendorf, James Muzerolle, Patrick Ogle, Cheryl Pavlovsky, Maria Pena-Guerrero, Charles Proffitt, Elena Puga, Tim Rawle, Beth Sargent, Marco Sirianni, Dave Soderblom, Leonardo Ubeda, Glenn Wahlgren, and Emily Wislowski.

More about NIRSpec

See also ...

External  NIRSpec links and documents

NIRSpec at STScI

NIRSpec at ESA

NIRSpec at ESA for scientists



JWST Community Lecture Series - NIRSpec Overview (P. Ferruit)

Other documents

JWST Pocket Guide

JWST technical documents



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