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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…
CLASSY. VI. The Density, Structure, and Size of Absorption-line Outflows in Starburst Galaxies
Martin, Crystal L.; Scarlata, Claudia; Henry, Alaina +12 more
Galaxy formation and evolution are regulated by the feedback from galactic winds. Absorption lines provide the most widely available probe of winds. However, since most data only provide information integrated along the line of sight, they do not directly constrain the radial structure of the outflows. In this paper, we present a method to directl…
Carbon-enhanced metal-poor star candidates from BP/RP spectra in Gaia DR3
Ting, Yuan-Sen; Yoon, Jinmi; Beers, Timothy C. +6 more
Carbon-enhanced metal-poor (CEMP) stars comprise almost a third of stars with [Fe/H] < -2, although their origins are still poorly understood. It is highly likely that one sub-class (CEMP-s stars) is tied to mass-transfer events in binary stars, while another sub-class (CEMP-no stars) are enriched by the nucleosynthetic yields of the first gene…
Detection of the Low-stellar-mass Host Galaxy of a z 6.25 Quasar with JWST
Lyu, Jianwei; Rieke, George H.; Alberts, Stacey +1 more
We characterize the stellar mass of J2239+0207, a z ~ 6.25 sub-Eddington quasar (M 1450 = -24.6), using dedicated JWST/NIRCam medium-band observations of a nearby point-spread function star to remove the central point source and reveal the underlying galaxy emission. We detect the host galaxy in two bands longward of the Balmer break, o…