Search Publications
A First Look at Spatially Resolved Balmer Decrements at 1.0 < z < 2.4 from JWST NIRISS Slitless Spectroscopy
Willott, Chris J.; Bradač, Maruša; Asada, Yoshihisa +14 more
We present the first results on the spatial distribution of dust attenuation at 1.0 < z < 2.4 traced by the Balmer decrement, Hα/Hβ, in emission-line galaxies using deep JWST NIRISS slitless spectroscopy from the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). Hα and Hβ emission-line maps of emission-line galaxies are extracted and stacked…
GOALS-JWST: Pulling Back the Curtain on the AGN and Star Formation in VV 114
Malkan, M. A.; Inami, H.; Murphy, E. J. +33 more
We present results from the James Webb Space Telescope Director's Discretionary Time Early Release Science program 1328 targeting the nearby, luminous infrared galaxy, VV 114. We use the MIRI and NIRSpec instruments to obtain integral-field spectroscopy of the heavily obscured eastern nucleus (V114E) and surrounding regions. The spatially resolved…
The LOFAR Two-metre Sky Survey: the radio view of the cosmic star formation history
Prandoni, I.; Hardcastle, M. J.; Röttgering, H. J. A. +9 more
We present a detailed study of the cosmic star formation history over 90 per cent of cosmic time (0 ≲ z ≲ 4), using deep, radio continuum observations that probe star formation activity independent of dust. The Low Frequency Array Two Metre Sky Survey has imaged three well-studied extragalactic fields, Elais-N1, Boötes, and the Lockman Hole, reach…
Rimmed and rippled accretion disc models to explain AGN continuum lags
Starkey, D. A.; Huang, Jiamu; Horne, Keith +1 more
We propose a solution to the problem of accretion disc sizes in active galactic nuclei being larger when measured by reverberation mapping than predicted by theory. Considering the disc's exposed-surface thickness profile H(r), our solution invokes a steep rim or rippled structures irradiated by the central lamp-post. We model the continuum lags a…
REQUIEM-2D: A Diversity of Formation Pathways in a Sample of Spatially Resolved Massive Quiescent Galaxies at z 2
Mahler, Guillaume; Richard, Johan; Bezanson, Rachel +16 more
REQUIEM-2D (Resolving Quiescent Magnified Galaxies with 2D Grism Spectroscopy) comprises a sample of eight massive ( ${\rm{log}}({M}_{\ast }/{M}_{\odot })\gt 10.6$ ) strongly lensed quiescent galaxies at z ~ 2. REQUIEM-2D combines the natural magnification from strong gravitational lensing with the high-spatial-resolution grism spectroscopy of the…
JWST catches the assembly of a z 5 ultra-low-mass galaxy
Ravindranath, Swara; Willott, Chris J.; Harshan, Anishya +14 more
Using CANUCS imaging we found an apparent major merger of two $z$ ~ 5 ultra-low-mass galaxies (M⋆~107M⊙ each) that are doubly imaged and magnified ~12-15× by the lensing cluster MACS 0417. Both galaxies are experiencing young (~100 Myr), synchronised bursts of star formation with log (sSFR/Gyr-1) ~1.3-1.…
Element abundance patterns in stars indicate fission of nuclei heavier than uranium
Beers, Timothy C.; Placco, Vinicius M.; Holmbeck, Erika M. +9 more
The heaviest chemical elements are naturally produced by the rapid neutron-capture process (r-process) during neutron star mergers or supernovae. The r-process production of elements heavier than uranium (transuranic nuclei) is poorly understood and inaccessible to experiments so must be extrapolated by using nucleosynthesis models. We examined el…
On the masses, age, and architecture of the VHS J1256-1257AB b system
Dupuy, Trent J.; Bardalez Gagliuffi, Daniella C.; Liu, Michael C. +5 more
VHS J1256-1257 AB is an ultracool dwarf binary that hosts a wide-separation planetary-mass companion that is a key target of the JWST Exoplanet Early Release Science programme. Using Keck adaptive optics imaging and aperture masking interferometry, we have determined the host binary's orbit (a = 1.96 ± 0.03 au, P = 7.31 ± 0.02 yr, e = 0.883 ± 0.00…
Formation of star clusters and enrichment by massive stars in simulations of low-metallicity galaxies with a fully sampled initial stellar mass function
Kauffmann, Guinevere; Naab, Thorsten; Lahén, Natalia +6 more
We present new GRIFFIN project hydrodynamical simulations that model the formation of galactic star cluster populations in low-metallicity (Z = 0.00021) dwarf galaxies, including radiation, supernova, and stellar wind feedback of individual massive stars. In the simulations, stars are sampled from the stellar initial mass function (IMF) down to th…
XUE: Molecular Inventory in the Inner Region of an Extremely Irradiated Protoplanetary Disk
Henning, Thomas; Bik, Arjan; Tabone, Benoît +24 more
We present the first results of the eXtreme UV Environments (XUE) James Webb Space Telescope (JWST) program, which focuses on the characterization of planet-forming disks in massive star-forming regions. These regions are likely representative of the environment in which most planetary systems formed. Understanding the impact of environment on pla…