The Near-infrared Imager and Slitless Spectrograph for the James Webb Space Telescope. II. Wide Field Slitless Spectroscopy

Willott, Chris J.; Doyon, René; Li, Albert; Brammer, Gabriel; Dixon, W. V.; Mužić, Koraljka; Ravindranath, Swara; Scholz, Alexander; Abraham, Roberto; Artigau, Étienne; Bradač, Maruša; Goudfrooij, Paul; Hutchings, J. B.; Iyer, Kartheik G.; Jayawardhana, Ray; LaMassa, Stephanie; Martis, Nicholas; Meyer, Michael; Morishita, Takahiro; Mowla, Lamiya; Muzzin, Adam; Noirot, Gaël; Pacifici, Camilla; Rowlands, Neil; Sarrouh, Ghassan; Sawicki, Marcin; Taylor, Joanna M.; Volk, Kevin; Zabl, Johannes

doi:10.1088/1538-3873/ac5158

Cited by 51 publications

(39 citation statements)

References 67 publications

(59 reference statements)

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“…Pontoppidan) were publicly released as part of the JWST Early Release Observations program on the 2022 July 13. The observations were carried out with the JWST Near Infrared Camera (NIRCam; Rieke et al 2005), MIRI (Rieke et al 2015;Wright et al 2015), the Near Infrared Imager and Slitless Spectrograph (Willott et al 2022), and the Near Infrared Spectrograph (NIRSpec; Jakobsen et al 2022). In the following, we briefly describe the MIRI and NIRCam observations we exploited in our work.…”

Section: Jwst Imagingmentioning

confidence: 99%

A First Look into the Nature of JWST/MIRI 7.7 μm Sources from SMACS 0723

Iani

Caputi

Rinaldi

et al. 2022

ApJL

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Until now, our knowledge of the extragalactic universe at mid-infrared (mid-IR) wavelengths (>5 μm) was limited to rare active galactic nuclei and the brightest normal galaxies up to z ∼ 3. The advent of JWST with its Mid-Infrared Instrument (MIRI) will revolutionize the ability of the mid-IR regime as a key wavelength domain to probe the high-z universe. In this work we present a first study of JWST MIRI 7.7 μm sources selected with >3σ significance from the lensing cluster field SMACS J0723.3-7327. We model their spectral energy distribution (SED) fitting with 13 JWST and Hubble Space Telescope broad bands, in order to obtain photometric redshifts and derived physical parameters for all these sources. We find that this 7.7 μm galaxy sample is mainly composed of normal galaxies up to z = 4 and has a tail of about 2% of sources at higher redshifts to z ≈ 9–10. The vast majority of our galaxies have [3.6]–[7.7] < 0 colors and very few of them need high dust extinction values (A V = 3–6 mag) for their SED fitting. The resulting lensing-corrected stellar masses span the range 107–1011 M ⊙. Overall, our results clearly show that the first MIRI 7.7 μm observations of deep fields are already useful to probe the high-redshift universe and suggest that the deeper 7.7 μm observations to be available very soon will open up, for the first time, the epoch of reionization at mid-IR wavelengths.

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Section: Jwst Imagingmentioning

confidence: 99%

A First Look into the Nature of JWST/MIRI 7.7 μm Sources from SMACS 0723

Iani

Caputi

Rinaldi

et al. 2022

ApJL

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“…The Near-infrared Imager and Slitless Spectrograph (NIRISS; Willott et al 2022) on board the James Webb Space Telescope (JWST) now enables a tremendous leap forward with its superior sensitivity, angular resolution, and longer-wavelength coverage compared to HST/WFC3. This allows resolved metallicity studies probing higher redshifts and lower-mass galaxies, which are a powerful discriminant of feedback and outflow models (e.g., Ma et al 2017;Hemler et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Early Results from GLASS-JWST. IV. Spatially Resolved Metallicity in a Low-mass z ∼ 3 Galaxy with NIRISS*

Jones¹,

Vulcani²,

Treu³

et al. 2022

ApJL

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We report the first gas-phase metallicity map of a distant galaxy measured with the James Webb Space Telescope (JWST). We use the NIRISS slitless spectroscopy acquired by the GLASS Early Release Science program to spatially resolve the rest-frame optical nebular emission lines in a gravitationally lensed galaxy at z = 3.06 behind the A2744 galaxy cluster. This galaxy (dubbed GLASS-Zgrad1) has stellar mass ∼108.6 M ⊙, instantaneous star formation rate ∼8.6 M ⊙ yr−1 (both corrected for lensing magnification), and global metallicity one-fourth solar. From its emission-line maps ([O iii], Hβ, Hγ, [Ne iii], and [O ii]), we derive its spatial distribution of gas-phase metallicity using a well-established forward-modeling Bayesian inference method. The exquisite resolution and sensitivity of JWST/NIRISS, combined with lensing magnification, enable us to resolve this z ∼ 3 dwarf galaxy in ≳50 resolution elements with sufficient signal, an analysis hitherto not possible. We find that the radial metallicity gradient of GLASS-Zgrad1 is strongly inverted (i.e., positive): Δ log ( O / H ) / Δ r = 0.165 ± 0.023 dex kpc−1. This measurement is robust at ≳ 4 − σ confidence level against known systematics. This positive gradient may be due to tidal torques induced by a massive nearby (∼15 kpc projected) galaxy, which can cause inflows of metal-poor gas into the central regions of GLASS-Zgrad1. These first results showcase the power of JWST wide-field slitless spectroscopic modes to resolve the mass assembly and chemical enrichment of low-mass galaxies in and beyond the peak epoch of cosmic star formation (z ≳ 2). Reaching masses ≲ 109 M ⊙ at these redshifts is especially valuable to constrain the effects of galactic feedback and environment and is possible only with JWST’s new capabilities.

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“…NIRCam imaging is available in six broadband filters: F090W, F150W, F200W, F277W, F356W, and F444W. Shallow NIRISS wide-field spectroscopy was obtained in the F115W and F200W filters with the two orthogonal low-resolution grisms to mitigate contamination (Willott et al 2022). Only the F115W grism data are used in this study, because they were taken with the only filter containing a strong emission line, [OIII] λ5007.…”

Section: Datamentioning

confidence: 99%

The Sparkler: Evolved High-redshift Globular Cluster Candidates Captured by JWST

Mowla¹,

Iyer²,

Desprez

et al. 2022

ApJL

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Using data from JWST, we analyse the compact sources (“sparkles”) located around a remarkable z spec = 1.378 galaxy (the ‘Sparkler) that is strongly gravitationally lensed by the z = 0.39 galaxy cluster SMACS J0723.3-7327. Several of these compact sources can be cross-identified in multiple images, making it clear that they are associated with the host galaxy. Combining data from JWSTs Near-Infrared Camera (NIRCam) with archival data from the Hubble Space Telescope (HST), we perform 0.4–4.4 μm photometry on these objects, finding several of them to be very red and consistent with the colors of quenched, old stellar systems. Morphological fits confirm that these red sources are spatially unresolved even in the strongly magnified JWST/NIRCam images, while the JWST/NIRISS spectra show [Oiii] λ5007 emission in the body of the Sparkler but no indication of star formation in the red compact sparkles. The most natural interpretation of these compact red companions to the Sparkler is that they are evolved globular clusters seen at z = 1.378. Applying Dense Basis spectral energy distribution fitting to the sample, we infer formation redshifts of z form ∼ 7–11 for these globular cluster candidates, corresponding to ages of ∼3.9–4.1 Gyr at the epoch of observation and a formation time just ∼0.5 Gyr after the Big Bang. If confirmed with additional spectroscopy, these red, compact sparkles represent the first evolved globular clusters found at high redshift, which could be among the earliest observed objects to have quenched their star formation in the universe, and may open a new window into understanding globular cluster formation. Data and code to reproduce our results will be made available at http://canucs-jwst.com/sparkler.html.

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The Near-infrared Imager and Slitless Spectrograph for the James Webb Space Telescope. II. Wide Field Slitless Spectroscopy

Cited by 51 publications

References 67 publications

A First Look into the Nature of JWST/MIRI 7.7 μm Sources from SMACS 0723

A First Look into the Nature of JWST/MIRI 7.7 μm Sources from SMACS 0723

Early Results from GLASS-JWST. IV. Spatially Resolved Metallicity in a Low-mass z ∼ 3 Galaxy with NIRISS*

The Sparkler: Evolved High-redshift Globular Cluster Candidates Captured by JWST

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