Search Publications
Early Results from GLASS-JWST. XX. Unveiling a Population of "Red Excess" Galaxies in Abell2744 and in the Coeval Field
Santini, Paola; Calabrò, Antonello; Castellano, Marco +26 more
We combine JWST/NIRCam imaging and MUSE data to characterize the properties of galaxies in different environmental conditions in the cluster Abell2744 (z = 0.3064) and in its immediate surroundings. We investigate how galaxy colors, morphology, and star-forming fractions depend on wavelength and on different parameterizations of environment. Our m…
A Reexamination of Phosphorus and Chlorine Depletions in the Diffuse Interstellar Medium
Ritchey, Adam M.; Federman, S. R.; Brown, J. M. +1 more
We present a comprehensive examination of interstellar P and Cl abundances based on an analysis of archival spectra acquired with the Space Telescope Imaging Spectrograph of the Hubble Space Telescope and the Far Ultraviolet Spectroscopic Explorer. Column densities of P II, Cl I, and Cl II are determined for a combined sample of 107 sight lines pr…
Retrospective Search for Strongly Lensed Supernovae in the DESI Legacy Imaging Surveys
Schlegel, David J.; Huang, Xiaosheng; Suzuki, Nao +3 more
The introduction of deep wide-field surveys in recent years and the adoption of machine-learning techniques have led to the discoveries of ${ \mathcal O }({10}^{4})$ strong gravitational lensing systems and candidates. However, the discovery of multiply-lensed transients remains a rarity. Lensed transients and especially lensed supernovae are inva…
Deciphering Solar Coronal Heating: Energizing Small-scale Loops through Surface Convection
Madjarska, M. S.; Rouppe van der Voort, L.; Joshi, R. +4 more
The solar atmosphere is filled with clusters of hot small-scale loops commonly known as coronal bright points (CBPs). These ubiquitous structures stand out in the Sun by their strong X-ray and/or extreme-ultraviolet (EUV) emission for hours to days, which makes them a crucial piece when solving the solar coronal heating puzzle. In addition, they c…
Pointlike Sources among z > 11 Galaxy Candidates: Contaminants due to Supernovae at High Redshifts?
Yan, Haojing; Wang, Lifan; Ma, Zhiyuan +1 more
The recent searches for z > 11 galaxies using the James Webb Space Telescope have resulted in an unexpectedly high number of candidate objects, which imply at least 1 order of magnitude higher number density of z > 11 galaxies than the previously favored predictions. A question has risen whether there are some new types of contaminants among…
Fleeting Small-scale Surface Magnetic Fields Build the Quiet-Sun Corona
Woch, J.; Peter, H.; Chitta, L. P. +19 more
Arch-like loop structures filled with million Kelvin hot plasma form the building blocks of the quiet-Sun corona. Both high-resolution observations and magnetoconvection simulations show the ubiquitous presence of magnetic fields on the solar surface on small spatial scales of ~100 km. However, the question of how exactly these quiet-Sun coronal l…
Varstrometry for Off-nucleus and Dual Subkiloparsec AGN (VODKA). SDSS J1608+2716: A Subarcsecond Quadruply Lensed Quasar at z = 2.575
Shen, Yue; Oguri, Masamune; Zakamska, Nadia L. +5 more
We report Hubble Space Telescope (HST) Wide Field Camera 3 deep IR (F160W) imaging of SDSS J1608+2716. This system, located at a redshift of z = 2.575, was recently reported as a triple-quasar candidate with subarcsecond separations (~0.″25) based on selection from Gaia astrometry and follow-up Keck adaptive optics-assisted integral field unit spe…
The Merging of a Coronal Dimming and the Southern Polar Coronal Hole
Long, David M.; Baker, Deborah; Green, Lucie M. +4 more
We report on the merging between the southern polar coronal hole and an adjacent coronal dimming induced by a coronal mass ejection on 2022 March 18, resulting in the merged region persisting for at least 72 hr. We use remote sensing data from multiple co-observing spacecraft to understand the physical processes during this merging event. The evol…
Search for Extremely Metal-poor Stars with Gemini-N/Graces. I. Chemical-abundance Analysis
Koo, Jae-Rim; Beers, Timothy C.; Lee, Young Sun +5 more
We present stellar parameters and abundances of 13 elements for 18 very metal-poor (VMP; [Fe/H] < –2.0) stars, selected as extremely metal-poor (EMP; [Fe/H] < –3.0) candidates from the Sloan Digital Sky Survey and Large sky Area Multi-Object Fiber Spectroscopic Telescope survey. High-resolution spectroscopic observations were performed using…
VLTI/GRAVITY Observations and Characterization of the Brown Dwarf Companion HD 72946 B
Lutz, D.; Genzel, R.; Sturm, E. +97 more
Tension remains between the observed and modeled properties of substellar objects, but objects in binary orbits, with known dynamical masses, can provide a way forward. HD 72946 B is a recently imaged brown dwarf companion to a nearby, solar-type star. We achieve ~100 µas relative astrometry of HD 72946 B in the K band using VLTI/GRAVITY, un…