Search Publications
GOALS-JWST: Small Neutral Grains and Enhanced 3.3 µm PAH Emission in the Seyfert Galaxy NGC 7469
Inami, Hanae; Böker, Torsten; Law, David R. +37 more
We present James Webb Space Telescope (JWST) Near Infrared Spectrograph (NIRSpec) integral field spectroscopy of the nearby luminous infrared galaxy NGC 7469. We take advantage of the high spatial/spectral resolution and wavelength coverage of JWST/NIRSpec to study the 3.3 µm neutral polycyclic aromatic hydrocarbon (PAH) grain emission on ~2…
Chemodynamically Tagged Groups of CEMP Stars in the Halo of the Milky Way. I. Untangling the Origins of CEMP-s and CEMP-no Stars
Beers, Timothy C.; Placco, Vinicius M.; Mardini, Mohammad +7 more
We construct a sample of 644 carbon-enhanced metal-poor (CEMP) stars with abundance analyses based on moderate- to high-resolution spectroscopic studies. Dynamical parameters for these stars are estimated based on radial velocities, Bayesian parallax-based distance estimates, and proper motions from Gaia EDR3 and DR3, supplemented by additional av…
Early Results from GLASS-JWST. XIII. A Faint, Distant, and Cold Brown Dwarf
Santini, Paola; Castellano, Marco; Fontana, Adriano +18 more
We present the serendipitous discovery of a late T-type brown dwarf candidate in JWST NIRCam observations of the Early Release Science Abell 2744 parallel field. The discovery was enabled by the sensitivity of JWST at 4 µm wavelengths and the panchromatic 0.9-4.5 µm coverage of the spectral energy distribution. The unresolved point sou…
Stellar Escape from Globular Clusters. I. Escape Mechanisms and Properties at Ejection
Chatterjee, Sourav; Kremer, Kyle; Weatherford, Newlin C. +3 more
The theory of stellar escape from globular clusters (GCs) dates back nearly a century, especially the gradual evaporation of GCs via two-body relaxation coupled with external tides. More violent ejection can also occur via strong gravitational scattering, supernovae, gravitational wave-driven mergers, tidal disruption events, and physical collisio…
The Magnificent Five Images of Supernova Refsdal: Time Delay and Magnification Measurements
Treu, Tommaso; Broadhurst, Tom; Filippenko, Alexei V. +28 more
In late 2014, four images of supernova (SN) "Refsdal," the first known example of a strongly lensed SN with multiple resolved images, were detected in the MACS J1149 galaxy-cluster field. Following the images' discovery, the SN was predicted to reappear within hundreds of days at a new position ~8″ away in the field. The observed reappearance in l…
HETDEX Public Source Catalog 1: 220 K Sources Including Over 50 K Lyα Emitters from an Untargeted Wide-area Spectroscopic Survey
Ouchi, Masami; Finkelstein, Steven L.; Schneider, Donald P. +43 more
We present the first publicly released catalog of sources obtained from the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). HETDEX is an integral field spectroscopic survey designed to measure the Hubble expansion parameter and angular diameter distance at 1.88 < z < 3.52 by using the spatial distribution of more than a million Lyα-e…
An Hα Impression of Lyα Galaxies at z ≃ 6 with Deep JWST/NIRCam Imaging
Jiang, Linhua; Ning, Yuanhang; Cai, Zheng +3 more
We present a study of seven spectroscopically confirmed (Lyα-emitting) galaxies at redshift z ≃ 6 using the JWST/NIRCam imaging data. These galaxies, with a wide range of Lyα luminosities, were recently observed in a series of NIRCam broad and medium bands. We constrain the rest-frame UV/optical continua and measure the Hα line emission of the gal…
PHANGS-JWST First Results: The Dust Filament Network of NGC 628 and Its Relation to Star Formation Activity
Sandstrom, Karin M.; Henshaw, Jonathan D.; Kruijssen, J. M. Diederik +36 more
PHANGS-JWST mid-infrared (MIR) imaging of nearby spiral galaxies has revealed ubiquitous filaments of dust emission in intricate detail. We present a pilot study to systematically map the dust filament network (DFN) at multiple scales between 25 and 400 pc in NGC 628. MIRI images at 7.7, 10, 11.3, and 21 µm of NGC 628 are used to generate ma…
Keck Integral-field Spectroscopy of M87 Reveals an Intrinsically Triaxial Galaxy and a Revised Black Hole Mass
Ma, Chung-Pei; Walsh, Jonelle L.; Liepold, Emily R.
The three-dimensional intrinsic shape of a galaxy and the mass of the central supermassive black hole provide key insight into the galaxy's growth history over cosmic time. Standard assumptions of a spherical or axisymmetric shape can be simplistic and can bias the black hole mass inferred from the motions of stars within a galaxy. Here, we presen…
Fractal Aggregates of Submicron-sized Grains in the Young Planet-forming Disk around IM Lup
Ginski, Christian; Tazaki, Ryo; Dominik, Carsten
Despite rapidly growing disk observations, it remains a mystery what primordial dust aggregates look like and what the physical and chemical properties of their constituent grains (monomers) are in young planet-forming disks. Confrontation of models with observations to answer this mystery has been a notorious task because we have to abandon a com…