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Peeling back the layers of extinction of dusty galaxies in the era of JWST: modelling joint NIRSpec + MIRI spectra at rest-frame 1.5-28 µm
Rigopoulou, D.; Pereira-Santaella, M.; Alonso-Herrero, A. +3 more
We present an analysis of the combined NIRSpec and MIRI spectra of dusty galaxies between 1.5 and 28 $\mu$m rest-frame by implementing a differential extinction model, where the strength of extinction varies across the spectrum as different layers of the obscuring dust are probed. Our model is able to recover a 2D distribution of dust temperature …
JWST-TST High Contrast: Asymmetries, Dust Populations, and Hints of a Collision in the β Pictoris Disk with NIRCam and MIRI
Stark, Christopher C.; Valenti, Jeff A.; van der Marel, Roeland P. +21 more
We present the first JWST Mid-Infrared Instrument (MIRI) and Near Infrared Camera (NIRCam) observations of the prominent debris disk around β Pictoris. Coronagraphic observations in eight filters spanning from 1.8 to 23 µm provide an unprecedentedly clear view of the disk at these wavelengths. The objectives of the observing program were to …
Unveiling lens light complexity with a novel multi-Gaussian expansion approach for strong gravitational lensing
Massey, Richard; Robertson, Andrew; Cole, Shaun +8 more
In a strong gravitational lensing system, the distorted light from a source is analysed to infer the properties of the lens. However, light emitted by the lens itself can contaminate the image of the source, introducing systematic errors in the analysis. We present a simple and efficient lens light model based on the well-tested multi-Gaussian exp…
MIDIS: JWST/MIRI Reveals the Stellar Structure of ALMA-selected Galaxies in the Hubble Ultra Deep Field at Cosmic Noon
Henning, Thomas; Costantin, Luca; Boogaard, Leindert A. +30 more
We present deep James Webb Space Telescope (JWST)/Mid-Infrared Instrument (MIRI) F560W observations of a flux-limited, Atacama Large Millimeter/submillimeter Array (ALMA)-selected sample of 28 galaxies at z = 0.5–3.7 in the Hubble Ultra Deep Field (HUDF). The data from the MIRI Deep Imaging Survey (MIDIS) reveal the stellar structure of the HUDF g…
JWST COMPASS: NIRSpec/G395H Transmission Observations of the Super-Earth TOI-836b
Batalha, Natalie M.; Moran, Sarah E.; Kirk, James +13 more
We present two transit observations of the ∼870 K, 1.7 R ⊕ super-Earth TOI-836b with JWST NIRSpec/G395H, resulting in a 2.8–5.2 µm transmission spectrum. Using two different reduction pipelines, we obtain a median transit depth precision of 34 ppm for Visit 1 and 36 ppm for Visit 2, leading to a combined precision of 25 ppm in spe…
JWST MIRI flight performance: Imaging
Temim, Tea; Gordon, Karl D.; Law, David R. +37 more
The 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 th…
Measurement of D/H and 13C/12C ratios in methane ice on Eris and Makemake: Evidence for internal activity
Lunine, J. I.; Emery, J. P.; Hammel, H. B. +13 more
James Webb Space Telescope's NIRSpec infrared imaging spectrometer observed the outer solar system dwarf planets Eris and Makemake in reflected sunlight at wavelengths spanning 1 through 5 µm. Both objects have high albedo surfaces that are rich in methane ice, with a texture that permits long optical path lengths through the ice for solar p…
GRB 180128A: A second magnetar giant flare candidate from the Sculptor Galaxy
Andreoni, Igor; Frederiks, Dmitry D.; Svinkin, Dmitry S. +14 more
Magnetars are slowly rotating neutron stars that possess the strongest magnetic fields known in the cosmos (1014 − 1015 G). They display a range of transient high-energy electromagnetic activity. The brightest and most energetic of these events are the gamma-ray bursts (GRBs) known as magnetar giant flares (MGFs), with isotro…
Geometric distortion and astrometric calibration of the JWST MIRI Medium Resolution Spectrometer
Law, David R.; Álvarez-Márquez, Javier; Vandenbussche, Bart +13 more
Context. The Medium Resolution integral field Spectrometer (MRS) of the Mid-Infrared Instrument (MIRI) on board the James Webb Space Telescope (JWST) performs spectroscopy between 5 and 28 µm, with a field of view varying from ~13 to ~56 sq. arcsec. The optics of the MRS introduce substantial distortion and this needs to be rectified in order to r…
Large-scale Structures in COSMOS2020: Evolution of Star Formation Activity in Different Environments at 0.4 < z < 4
Casey, Caitlin M.; Kartaltepe, Jeyhan S.; Mobasher, Bahram +15 more
To study the role of environment in galaxy evolution, we reconstruct the underlying density field of galaxies based on COSMOS2020 (The Farmer catalog) and provide the density catalog for a magnitude-limited (K s < 24.5) sample of ∼210,000 galaxies at 0.4 < z < 5 within the COSMOS field. The environmental densities are calcula…