NIRSpec spectra

example spectrum JADES-DEEP Prism spectrum of GOODS-South #58975

Here you can find various ways to access uniformly-reduced public NIRSpec datasets:

  • nirspec_graded.html: Searchable table of all public spectra reduced so far
  • For pannable images with various possible layers, including HST and JWST filters as well as spectral observations, see the Map View pages. To see individual spectra, pan over a source with the different Spectra overlays enabled.
  • See the nirspec-data-products post for examples on working directly with the catalog and individual extracted spectra

More documentation coming soon. The spectroscopy reduction process is described in Heintz et al., 2023, and the msaexp software used to process the spectra is freely available.

Public NIRSpec datasets

These are the public datasets in the nirspec_graded.html compilation:

root JWST program Grating-Filter t, hours N total N grade=3
abell2744-ddt-v1 2756 PRISM-CLEAR 0.6 111 51
abell2744-glass-v1 1324 G140H-F100LP 6.5 179 27
abell2744-glass-v1 1324 G235H-F170LP 6.5 176 35
abell2744-glass-v1 1324 G395H-F290LP 6.5 177 31
ceers-ddt-v1 2750 PRISM-CLEAR 5.1 266 109
ceers-lr-v1 1345 PRISM-CLEAR 0.9 1058 539
ceers-mr-v1 1345 G140M-F100LP 1.7 302 77
ceers-mr-v1 1345 G235M-F170LP 1.7 302 115
ceers-mr-v1 1345 G395M-F290LP 1.7 302 126
gds-deep-hr-v1 1210 G395H-F290LP 4.6 154 57
gds-deep-lr-v1 1210 PRISM-CLEAR 9.2 294 159
gds-deep-mr-v1 1210 G140M-F070LP 4.6 217 18
gds-deep-mr-v1 1210 G235M-F170LP 4.6 216 59
gds-deep-mr-v1 1210 G395M-F290LP 4.6 221 68
goodsn-wide-v1 1211 PRISM-CLEAR 0.7 182 80
macsj0647-single-v1 1433 PRISM-CLEAR 1.8 69 19
macsj0647-v1 1433 PRISM-CLEAR 1.8 132 46
rxj2129-ddt-v1 2767 G140M-F070LP 2.2 20 0
rxj2129-ddt-v1 2767 G140M-F100LP 2.2 20 3
rxj2129-ddt-v1 2767 PRISM-CLEAR 1.2 103 34
smacs0723-ero-v1 2736 G235M-F170LP 9.7 50 12
smacs0723-ero-v1 2736 G395M-F290LP 9.7 51 16
snH0pe-v1 4446 G140M-F100LP 2.4 39 17
snH0pe-v1 4446 G235M-F170LP 3.6 39 15
snH0pe-v1 4446 PRISM-CLEAR 0.2 39 17
whl0137-v1 2282 PRISM-CLEAR 1.0 405 80
Total       5124 1810
  • Exposure time per spectrum t computed from median(effexptm) in the spectra files, which isn’t quite correct and double-counts exposure times for spectral extractions that overlap both NRS1 and NRS2 detectors

Full visualization

1000 NIRSpec prism spectra in one plot!

Spectral coverage comparison

One aspect of the unique power of the NIRSpec PRISM mode is the broad wavelength coverage from 0.7 < λ < 5.3 µm. The comparisons below show the wavelength coverage from WFC3 G141 slitless spectroscopy or from a ground-based near-infrared spectrograph such as Keck/MOSFIRE with its attendant atmospheric windows. Note that the comparison just shows the wavelength coverage, not differences in sensitivity and spectral resolution, which are significant between these observing modes.

spetrum comparison