J/A+A/699/A225 GLASS-JWST ERS. NIRISS spectroscopic catalog (Watson+, 2025)
The GLASS-JWST Early Release Science Programme:
The NIRISS spectroscopic catalogue.
Watson P. J., Vulcani B., Treu T., Roberts-Borsani G., Dalmasso N., He X.,
Malkan M. A., Morishita T., Rojas Ruiz S., Zhang Y., Acharyya A.,
Bergamini P., Bradac M., Fontana A., Grillo C., Jones T., Marchesini D.,
Nanayakkara T., Pentericci L., Tubthong C., Wang X.
<Astron. Astrophys. 699, A225 (2025)>
=2025A&A...699A.225W 2025A&A...699A.225W (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Clusters, galaxy ; Galaxy catalogs ; Redshifts ;
Spectra, infrared
Keywords: catalogs - galaxies: clusters: general -
galaxies: distances and redshifts - galaxies: high-redshift
Abstract:
We release a spectroscopic redshift catalogue of sources in the Abell
2744 cluster field, derived from JWST/NIRISS observations taken as
part of the GLASS-JWST Early Release Science programme. We describe
the data reduction, contamination modelling and source detection, as
well as the data quality assessment, redshift determination and
validation. The catalogue consists of 354 secure and 134 tentative
redshifts, of which 245 are new spectroscopic redshifts, spanning a
range 0.1≤z≤8.2. These include 17 galaxies at the cluster redshift,
one galaxy at z∼8, and a triply-imaged galaxy at z=2.653±0.002.
Comparing against galaxies with existing spectroscopic redshifts
zspec, we find a small offset of
Δz=zspec-zniriss/(1+zspec)=(1.3±1.6)x10-3. We also
release a forced extraction tool "pygrife" and a visualisation tool
"pygcg" to the community, to aid with the reduction and classification
of grism data. This catalogue will enable future studies of the
spatially-resolved properties of galaxies throughout cosmic noon,
including dust attenuation and star formation. As the first
exploitation of the catalogue, we discuss the spectroscopic
confirmation of multiple image systems, and the identification of
multiple overdensities at 1<z<2.7.
Description:
As part of the GLASS-JWST ERS programme, we used JWST/NIRISS in the
Wide-Field Slitless Spectroscopy (WFSS) mode, to conduct
low-resolution spectroscopy in the Abell 2744 cluster field. The
observing strategy called for approximately 18 hours of slitless
spectroscopy and imaging, using the F115W, F150W, and F200W blocking
filters to cover a wavelength range ∼1.0-2.2 microns, at a spectral
resolution R∼150 (at 1.4 microns). The observations consisted of a
single pointing, which covered an area of 2.2'x2.2' centred on the
core of the cluster.
We reduced the data using version 1.12.8 of grizli (Brammer et al.,
2019ascl.soft05001B), adopting the "*221215.conf" grism trace
configuration files (Matharu et al., 2022, 10.5281/zenodo.7628094),
and the STScI calibration pipeline, with CRDS context
"jwst_1173.pmap". 3652 sources were detected on the drizzled stacked
direct images using SEP (Barbary et al., 2016zndo....159035B). Through
fitting the 2D spectra with grizli, and visually inspecting the
results with multiple team members, we were able to determine the
redshift for 488 galaxies in the field of view. Of these, 354 were
flagged as "secure", and 134 as "tentative". We release here the
catalogue containing these redshifts, and emission line fluxes
measured from the 2D spectra, where available.
Objects:
--------------------------------------------
RA (2000) DE Designation(s)
--------------------------------------------
00 14 20.02 -30 23 17.8 A2744 = ACO 2744
--------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
catalog.dat 237 3652 Spectroscopic catalogue, containing the locations
of all NIRISS-detected sources, and the best-fit
redshifts (488) and emission line fluxes where
available
--------------------------------------------------------------------------------
See also:
J/ApJ/812/114 : Grism Lens-Amplified Survey from Space (GLASS). I.
(Treu+, 2015)
J/ApJ/940/L52 : Early results from GLASS-JWST. VI. NIRISS WFFS (Boyett+, 2022)
J/ApJ/952/20 : GLASS-JWST Early Release Science Prog. II. ACO 2744
(Paris+, 2023)
J/ApJS/270/12 : The UNCOVER SPS cat. for robust sources up to z∼15
(Wang+, 2024)
J/ApJS/270/7 : The UNCOVER phot. catalog of A2744 wiht HST+JWST
(Weaver+, 2024)
J/A+A/691/A240 : ASTRODEEP-JWST photometry and redshifts (Merlin+, 2024)
Byte-by-byte Description of file: catalog.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- NIRISS [1/3895] Unique identifier for sources in
this catalogue
6- 13 F8.6 deg RAdeg Right ascension (J2000)
15- 24 F10.6 deg DEdeg Declination (J2000)
26- 33 F8.5 --- zNIRISS [0.11/8.2]? Best-fit grism redshift
35 I1 --- f_zNIRISS [0/4] Redshift quality flag (1)
37- 39 F3.1 --- F115W-072Qual [0/2] Quality flag for the dispersed 2D
spectra using the F115W filter, and a
position angle of 72.0 degrees (2)
41- 43 F3.1 --- F115W-341Qual [0/2] Quality flag for the dispersed 2D
spectra using the F115W filter, and a
position angle of 341.0 degrees (2)
45- 47 F3.1 --- F150W-072Qual [0/2] Quality flag for the dispersed 2D
spectra using the F150W filter, and a
position angle of 72.0 degrees (2)
49- 51 F3.1 --- F150W-341Qual [0/2] Quality flag for the dispersed 2D
spectra using the F150W filter, and a
position angle of 341.0 degrees (2)
53- 55 F3.1 --- F200W-072Qual [0/2] Quality flag for the dispersed 2D
spectra using the F200W filter, and a
position angle of 72.0 degrees (2)
57- 59 F3.1 --- F200W-341Qual [0/2] Quality flag for the dispersed 2D
spectra using the F200W filter, and a
position angle of 341.0 degrees (2)
61 I1 --- Nlines Number of emission lines for which it
was possible to measure a flux (3)
63- 81 A19 --- Lines Semicolon separated names of the
measured emission lines
83- 94 E12.6 mW/m2 F[OII] ?=0 [OII]-3727,3729 emission line flux
96-107 E12.6 mW/m2 e_F[OII] ?=0 [OII]-3727,3729 1σ flux
uncertainties
109-120 E12.6 mW/m2 FHb ?=0 Hβ emission line flux
122-133 E12.6 mW/m2 e_FHb ?=0 Hβ 1σ flux uncertainties
135-146 E12.6 mW/m2 F[OIII] ?=0 [OIII]-4959,5007 emission line flux
148-159 E12.6 mW/m2 e_F[OIII] ?=0 [OIII]-4959,5007 1σ flux
uncertainties
161-172 E12.6 mW/m2 FHa ?=0 Hα emission line flux
174-185 E12.6 mW/m2 e_FHa ?=0 Hα 1σ flux uncertainties
187-198 E12.6 mW/m2 F[SII] ?=0 [SII]-6716,6731 emission line flux
200-211 E12.6 mW/m2 e_F[SII] ?=0 [SII]-6716,6731 1σ flux
uncertainties
213-224 E12.6 mW/m2 F[SIII] ?=0 [SIII]-9068,9531 emission line flux
226-237 E12.6 mW/m2 e_F[SIII] ?=0 [SIII]-9068,9531 1σ flux
uncertainties
--------------------------------------------------------------------------------
Note (1): Redshift quality flag as follows:
0 = source not extracted
1 = source rejected on initial inspection
2 = undetermined redshift
3 = tentative redshift
4 = secure redshift
Note (2): Quality flag as follows:
0 = unusable data
1 = poor quality
2 = good quality
Note (3): from the set [OII]-3727,3729; Hβ; [OIII]-4959,5007; Hα;
[SII]-6716,6731; [SIII]-9068,9531.
--------------------------------------------------------------------------------
Acknowledgements:
Peter J. Watson, peter.watson(at)inaf.it
References:
Roberts-Borsani et al. Paper I 2022ApJ...938L..13R 2022ApJ...938L..13R
Merlin et al. Paper II 2022ApJ...938L..14M 2022ApJ...938L..14M
Castellano et al. Paper III 2022ApJ...938L..15C 2022ApJ...938L..15C
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(End) Peter J. Watson [INAF], Patricia Vannier [CDS] 10-Jun-2025