Search Publications
Galaxy assembly revealed by globular clusters
Chen, Yingtian; Gnedin, Oleg Y.
Many observable properties of globular clusters (GCs) provide valuable insights for unveiling the hierarchical assembly of their host galaxy. For the Milky Way (MW) in particular, GCs from different accreted satellite galaxies show distinct chemical, spatial, kinematic, and age distributions. Here we examine such clustering features for model GC p…
A case for a binary black hole system revealed via quasi-periodic outflows
Steiner, James F.; Holoien, Thomas W. -S.; Daylan, Tansu +33 more
Binaries containing a compact object orbiting a supermassive black hole are thought to be precursors of gravitational wave events, but their identification has been extremely challenging. Here, we report quasi-periodic variability in x-ray absorption, which we interpret as quasi-periodic outflows (QPOuts) from a previously low-luminosity active ga…
Probing the early Milky Way with GHOST spectra of an extremely metal-poor star in the Galactic disc
Simpson, Chris; Placco, Vinicius M.; Hayes, Christian R. +31 more
Pristine_183.6849 + 04.8619 (P1836849) is an extremely metal-poor ([Fe/H] = -3.3 ± 0.1) star on a prograde orbit confined to the Galactic disc. Such stars are rare and may have their origins in protogalactic fragments that formed the early Milky Way, in low-mass satellites accreted later, or forming in situ in the Galactic plane. Here, we present …
UVCANDELS: The Role of Dust on the Stellar Mass–Size Relation of Disk Galaxies at 0.5 ≤ z ≤ 3.0
Grogin, Norman A.; Koekemoer, Anton M.; Lucas, Ray A. +30 more
We use the Ultraviolet Imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey fields (UVCANDELS) to measure half-light radii in the rest-frame far-UV for ∼16,000 disk-like galaxies over 0.5 ≤ z ≤ 3. We compare these results to rest-frame optical sizes that we measure in a self-consistent way and find that the stellar mass–si…
JWST lensed quasar dark matter survey - I. Description and first results
Djorgovski, S. G.; Stern, D.; Treu, T. +18 more
The flux ratios of gravitationally lensed quasars provide a powerful probe of the nature of dark matter. Importantly, these ratios are sensitive to small-scale structure, irrespective of the presence of baryons. This sensitivity may allow us to study the halo mass function even below the scales where galaxies form observable stars. For accurate me…
JWST Spectroscopy of SN H0pe: Classification and Time Delays of a Triply Imaged Type Ia Supernova at z = 1.78
Grogin, Norman A.; Koekemoer, Anton M.; Frye, Brenda L. +19 more
SN H0pe is a triply imaged supernova (SN) at redshift z = 1.78 discovered using the James Webb Space Telescope. In order to classify the SN spectroscopically and measure the relative time delays of its three images (designated A, B, and C), we acquired NIRSpec follow-up spectroscopy spanning 0.6–5 µm. From the high signal-to-noise spectra of…
The Fraction of Dust Mass in the Form of Polycyclic Aromatic Hydrocarbons on 10–50 pc Scales in Nearby Galaxies
Ramambason, Lise; Leroy, Adam K.; Rosolowsky, Erik +21 more
Polycyclic aromatic hydrocarbons (PAHs) are a ubiquitous component of the interstellar medium (ISM) in z ∼ 0 massive, star-forming galaxies and play key roles in ISM energy balance, chemistry, and shielding. Wide field-of-view, high-resolution mid-infrared (MIR) images from JWST provide the ability to map the fraction of dust in the form of PAHs a…
HOLISMOKES: XI. Evaluation of supervised neural networks for strong-lens searches in ground-based imaging surveys
Suyu, S. H.; Cañameras, R.; Schuldt, S. +10 more
While supervised neural networks have become state of the art for identifying the rare strong gravitational lenses from large imaging data sets, their selection remains significantly affected by the large number and diversity of non-lens contaminants. This work evaluates and compares systematically the performance of neural networks in order to mo…
A large population of strongly lensed faint submillimetre galaxies in future dark energy surveys inferred from JWST imaging
Conselice, Christopher J.; Ho, Luis C.; Babul, Arif +13 more
Bright galaxies at submillimetre wavelengths from Herschel are now well known to be predominantly strongly gravitationally lensed. The same models that successfully predicted this strongly lensed population also predict about 1 per cent of faint 450 µm-selected galaxies from deep James Clerk Maxwell Telescope (JCMT) surveys will also be stro…
JWST Observations of Young protoStars (JOYS). Linked accretion and ejection in a Class I protobinary system
Güdel, Manuel; Le Gouellec, Valentin J. M.; Beuther, Henrik +19 more
Context. Accretion and ejection dictate the outcomes of star and planet formation processes. The mid-infrared (MIR) wavelength range offers key tracers of processes that have been difficult to detect and spatially resolve in protostars until now.
Aims: We aim to characterize the interplay between accretion and ejection in the low-mass Class I…