Search Publications
Finding Peas in the Early Universe with JWST
Kim, Keunho J.; Malhotra, Sangeeta; Pharo, John +6 more
The Early Release Observations (EROs) of JWST beautifully demonstrate the promise of JWST in characterizing the universe at Cosmic Dawn. We analyze the Near Infrared Spectrograph ERO spectra of three z ~ 8 galaxies to determine their metallicities, gas temperatures, and ionization. These galaxies offer the first opportunity to understand the physi…
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems I: High-contrast Imaging of the Exoplanet HIP 65426 b from 2 to 16 µm
Henning, Thomas; Fortney, Jonathan J.; Carter, Aarynn L. +108 more
We present JWST Early Release Science coronagraphic observations of the super-Jupiter exoplanet, HIP 65426b, with the Near-Infrared Camera (NIRCam) from 2 to 5 µm, and with the Mid-Infrared Instrument (MIRI) from 11 to 16 µm. At a separation of ~0.″82 (87 ${}_{-31}^{+108}$ au), HIP 65426b is clearly detected in all seven of our observa…
Spatially Resolved Properties of Galaxies at 5 < z < 9 in the SMACS 0723 JWST ERO Field
Fujimoto, Seiji; Heintz, Kasper E.; Suess, Katherine A. +10 more
We present the first spatially resolved measurements of galaxy properties in the JWST ERO SMACS 0723 field. We perform a comprehensive analysis of five 5 < z < 9 galaxies with spectroscopic redshifts from NIRSpec observations. We perform spatially resolved spectral energy distribution fitting with BAGPIPES, using six NIRCam imaging bands spa…
High-redshift Galaxy Candidates at z = 9-10 as Revealed by JWST Observations of WHL0137-08
Hutchison, Taylor A.; Larson, Rebecca L.; Mahler, Guillaume +25 more
We report the discovery of four galaxy candidates observed 450-600 Myr after the Big Bang with photometric redshifts between z ~ 8.3 and 10.2 measured using James Webb Space Telescope (JWST) NIRCam imaging of the galaxy cluster WHL0137-08 observed in eight filters spanning 0.8-5.0 µm, plus nine Hubble Space Telescope filters spanning 0.4-1.7…
MINDS. The Detection of 13CO2 with JWST-MIRI Indicates Abundant CO2 in a Protoplanetary Disk
Henning, Thomas; Waters, L. B. F. M.; Östlin, Göran +43 more
We present JWST-MIRI Medium Resolution Spectrometer (MRS) spectra of the protoplanetary disk around the low-mass T Tauri star GW Lup from the MIRI mid-INfrared Disk Survey Guaranteed Time Observations program. Emission from 12CO2, 13CO2, H2O, HCN, C2H2, and OH is identifi…
Evolution of the Mass-Metallicity Relation from Redshift z ≈ 8 to the Local Universe
Koekemoer, Anton M.; Broadhurst, Tom; Filippenko, Alexei V. +17 more
A tight positive correlation between the stellar mass and the gas-phase metallicity of galaxies has been observed at low redshifts. The redshift evolution of this correlation can strongly constrain theories of galaxy evolution. The advent of JWST allows probing the mass-metallicity relation at redshifts far beyond what was previously accessible. H…
A SPectroscopic Survey of Biased Halos in the Reionization Era (ASPIRE): JWST Reveals a Filamentary Structure around a z = 6.61 Quasar
Hennawi, Joseph F.; Shen, Yue; Strauss, Michael A. +56 more
We present the first results from the JWST program A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE). This program represents an imaging and spectroscopic survey of 25 reionization-era quasars and their environments by utilizing the unprecedented capabilities of NIRCam Wide Field Slitless Spectroscopy (WFSS) mode. ASPIRE will…
JWST Identification of Extremely Low C/N Galaxies with [N/O] ≳ 0.5 at z 6-10 Evidencing the Early CNO-cycle Enrichment and a Connection with Globular Cluster Formation
Ono, Yoshiaki; Ouchi, Masami; Harikane, Yuichi +9 more
We present chemical abundance ratios of 70 star-forming galaxies at z ~ 4-10 observed by the JWST/NIRSpec Early Release Observations, GLASS, and CEERS programs. Among the 70 galaxies, we have pinpointed two galaxies, CEERS_01019 at z = 8.68 and GLASS_150008 at z = 6.23, with extremely low C/N ([C/N] ≲ -1), evidenced with C III]λλ1907,1909, N III]λ…
CEERS Key Paper. VI. JWST/MIRI Uncovers a Large Population of Obscured AGN at High Redshifts
Elbaz, D.; Kartaltepe, J. S.; Dickinson, M. +35 more
Mid-infrared (mid-IR) observations are powerful in identifying heavily obscured active galactic nuclei (AGN) that have weak emission in other wavelengths. Data from the Mid-Infrared Instrument (MIRI) on board the James Webb Space Telescope provides an excellent opportunity to perform such studies. We take advantage of the MIRI imaging data from th…
Physical Characterization of Early Galaxies in the Webb's First Deep Field SMACS J0723.3-7323
Stiavelli, M.; Morishita, T.
This paper highlights initial photometric analyses of JWST NIRCam imaging data in the sightline of SMACS0723, aiming to identify galaxies at redshift z > 7. By applying a conservative Lyman-break selection followed by photometric-redshift analysis and visual inspection, we identify four F090W-dropout and two F150W-dropout sources, three of whic…