Results 101 to 110 of about 26,106 (206)
The Astrophysical JournalWe report the discovery of an extreme galaxy overdensity at z = 5.4 in the GOODS-S field using James Webb Space Telescope (JWST)/NIRCam imaging from JADES and JEMS alongside JWST/NIRCam wide-field slitless spectroscopy from FRESCO.
Jakob M. Helton +30 more
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The JWST and standard cosmology
International Journal of Modern Physics DRecent observations from the James Webb Space Telescope have identified a population of massive galaxy sources ([Formula: see text]) at [Formula: see text]–10, formed less than 700[Formula: see text]Myr after the Big Bang. Such massive galaxies do not have enough time to form within the standard cosmological model, and hence these observations pose a ...
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A JWST Survey of the Supernova Remnant Cassiopeia A
The Astrophysical Journal LettersAbstract We present initial results from a James Webb Space Telescope (JWST) survey of the youngest Galactic core-collapse supernova remnant, Cassiopeia A (Cas A), made up of NIRCam and MIRI imaging mosaics that map emission from the main shell, interior, and surrounding circumstellar/interstellar material (CSM/ISM). We also present four
Dan Milisavljevic +46 more
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Investigating the Electron-capture Supernova Candidate AT 2019abn with JWST Spectroscopy
The Astrophysical Journal LettersThe James Webb Space Telescope (JWST) has opened up a new window to study highly reddened explosive transients. We present results from late-time JWST follow-up spectroscopic observations with NIRSpec and MIRI-LRS of the intermediate-luminosity red ...
Sam Rose +7 more
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A JWST NIRCam/MIRI View of the W51A High-mass Star-forming Region
The Astronomical JournalWe present observations of the W51A region, including the massive protoclusters W51-E and W51-IRS2, with JWST in 10 NIRCam and 5 MIRI filters. In this work, we highlight the most novel features apparent in these images and compare them with other ...
Taehwa Yoo +12 more
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JWST MIRI flight performance: Imaging
Astronomy & AstrophysicsThe Mid-Infrared Instrument (MIRI) aboard the James Webb Space Telescope (JWST) provides the observatory with a huge advance in mid-infrared imaging and spectroscopy covering the wavelength range of 5–28 µm. This paper describes the performance and characteristics of the MIRI imager as understood during observatory commissioning activities, and through
Dan Dicken +39 more
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The Astrophysical Journal LettersThe interstellar extinction law is important for interpreting observations and inferring the properties of interstellar dust grains. Based on the 993 prism/CLEAR spectra from the James Webb Space Telescope (JWST), we investigate the 0.6–5.3 μ m ...
Shu Wang, Xiaodian Chen
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JWST Captures a Sudden Stellar Outburst and Inner Disk Wall Destruction
The Astrophysical JournalWe analyze JWST/MIRI observations of T Cha, a highly variable (Δ V ∼ 3–5 mag) accreting Sun-like star surrounded by a disk with a large (∼15 au) dust gap. We find that the JWST mid-IR spectrum is significantly different from the Spitzer spectrum obtained
Chengyan Xie +8 more
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JWST-TST High Contrast: JWST/NIRCam Observations of the Young Giant Planet β Pic b
The Astronomical JournalAbstract We present the first JWST/NIRCam observations of the directly imaged gas giant exoplanet β Pic b. Observations in six filters using NIRCam's round coronagraphic masks provide a high-signal-to-noise-ratio detection of β Pic b and the archetypal debris disk around β Pic over a wavelength range of ∼1.7–5 μm.
Jens Kammerer +16 more
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