Search Publications
Overview and public data release of the augmented Auriga Project: cosmological simulations of dwarf and Milky Way-mass galaxies
Springel, Volker; Grand, Robert J. J.; Gómez, Facundo A. +4 more
We present an extended suite of the Auriga cosmological gravo-magnetohydrodynamical 'zoom-in' simulations of 40 Milky Way-mass haloes and 26 dwarf galaxy-mass haloes run with the moving-mesh code AREPO. Auriga adopts the Lambda cold dark matter cosmogony and includes a comprehensive galaxy formation physics model following the coupled cosmic evolu…
Stellar Half-mass Radii of 0.5 z < 2.3 Galaxies: Comparison with JWST/NIRCam Half-light Radii
Bell, Eric F.; Franx, Marijn; Muzzin, Adam +13 more
We use CEERS JWST/NIRCam imaging to measure rest-frame near-IR light profiles of 435 M ⋆ > 1010 M ⊙ galaxies in the redshift range of 0.5 < z < 2.3. We compare the resulting rest-frame 1.5-2 µm half-light radii (R NIR) with stellar half-mass radii ( ${R}_{{{M}}_{\star }}$ ) derived with mu…
JWST reveals widespread AGN-driven neutral gas outflows in massive z 2 galaxies
Conroy, Charlie; Johnson, Benjamin D.; Belli, Sirio +15 more
We use deep JWST/NIRSpec R ~ 1000 slit spectra of 113 galaxies at $1.7 < z < 3.5$, selected from the mass-complete Blue Jay survey, to investigate the prevalence and typical properties of neutral gas outflows at cosmic noon. We detect excess Na ID absorption (beyond the stellar contribution) in 46 per cent of massive galaxies (log M*
Brown Dwarf Candidates in the JADES and CEERS Extragalactic Surveys
Johnson, Benjamin D.; Lyu, Jianwei; Eisenstein, Daniel J. +13 more
By combining the James Webb Space Telescope (JWST)/NIRCam JADES and CEERS extragalactic data sets, we have uncovered a sample of 21 T and Y brown dwarf candidates at best-fit distances between 0.1 and 4.2 kpc. These sources were selected by targeting the blue 1–2.5 µm colors and red 3–4.5 µm colors that arise from molecular absorption …
A New Population of Mid-infrared-selected Tidal Disruption Events: Implications for Tidal Disruption Event Rates and Host Galaxy Properties
Meisner, Aaron M.; Simcoe, Robert A.; Eilers, Anna-Christina +14 more
Most tidal disruption events (TDEs) are currently found in time-domain optical and soft X-ray surveys, both of which are prone to significant obscuration. The infrared (IR), however, is a powerful probe of dust-enshrouded environments; hence, we recently performed a systematic search of NEOWISE mid-IR data for nearby, obscured TDEs within roughly …
ΛCDM not dead yet: massive high-z Balmer break galaxies are less common than previously reported
Willott, Chris J.; Martis, Nicholas S.; Rihtaršič, Gregor +15 more
Early JWST observations that targeted so-called double-break sources (attributed to Lyman and Balmer breaks at z > 7), reported a previously unknown population of very massive, evolved high-redshift galaxies. This surprising discovery led to a flurry of attempts to explain these objects' unexpected existence including invoking alternatives to t…
On the Nature of Disks at High Redshift Seen by JWST/CEERS with Contrastive Learning and Cosmological Simulations
Papovich, Casey; Finkelstein, Steven L.; Pérez-González, Pablo G. +26 more
Visual inspections of the first optical rest-frame images from JWST have indicated a surprisingly high fraction of disk galaxies at high redshifts. Here, we alternatively apply self-supervised machine learning to explore the morphological diversity at z ≥ 3. Our proposed data-driven representation scheme of galaxy morphologies, calibrated on mock …
Constraints on the Faint End of the Galaxy Stellar Mass Function at z ≃ 4–8 from Deep JWST Data
Rinaldi, Pierluigi; Caputi, Karina I.; Iani, Edoardo +3 more
We analyze a sample of 3300 galaxies between redshifts z ≃ 3.5 and z ≃ 8.5 selected from James Webb Space Telescope (JWST) images in the Hubble Ultra Deep Field and UKIDSS Ultra Deep Survey field, including objects with stellar masses as low as ≃108 M ⊙ up to z ≃ 8. The depth and wavelength coverage of the JWST data allows us…
Sulfur dioxide in the mid-infrared transmission spectrum of WASP-39b
Carter, Aarynn L.; Sing, David K.; Batalha, Natalie M. +70 more
The recent inference of sulfur dioxide (SO2) in the atmosphere of the hot (approximately 1,100 K), Saturn-mass exoplanet WASP-39b from near-infrared JWST observations1-3 suggests that photochemistry is a key process in high-temperature exoplanet atmospheres4. This is because of the low (<1 ppb) abundance of SO
FRB 20210405I: a nearby Fast Radio Burst localized to sub-arcsecond precision with MeerKAT
Gromadzki, M.; Kramer, M.; Woudt, P. A. +19 more
We present the first sub-arcsecond localized Fast Radio Burst (FRB) detected using MeerKAT. FRB 20210405I was detected in the incoherent beam using the MeerTRAP pipeline on 2021 April 05 with a signal to noise ratio of 140.8 and a dispersion measure of 565.17 pc cm-3. It was detected while MeerTRAP was observing commensally with the Thu…