Search Publications
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…
First semi-empirical test of the white dwarf mass-radius relationship using a single white dwarf via astrometric microlensing
Casertano, Stefano; Anderson, Jay; McGill, Peter +15 more
In November 2019, the nearby single, isolated DQ-type white dwarf LAWD 37 (WD 1142-645) aligned closely with a distant background source and caused an astrometric microlensing event. Leveraging astrometry from Gaia and followup data from the Hubble Space Telescope, we measure the astrometric deflection of the background source and obtain a gravita…
Ultra-high-resolution observations of persistent null-point reconnection in the solar corona
Barczynski, K.; Peter, H.; Chitta, L. P. +21 more
Magnetic reconnection is a key mechanism involved in solar eruptions and is also a prime possibility to heat the low corona to millions of degrees. Here, we present ultra-high-resolution extreme ultraviolet observations of persistent null-point reconnection in the corona at a scale of about 390 km over one hour observations of the Extreme-Ultravio…
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…
Implications of z ≳ 12 JWST galaxies for galaxy formation at high redshift
Qin, Yuxiang; Balu, Sreedhar; Wyithe, J. Stuart B.
Using a semi-analytic galaxy formation model, we study analogues of eight z ≳ 12 galaxies recently discovered by James Webb Space Telescope (JWST). We select analogues from a cosmological simulation with a (311 cMpc)3 volume and an effective particle number of 1012 enabling the resolution of every atomic-cooling galaxy at z ≤…
JWST molecular mapping and characterization of Enceladus' water plume feeding its torus
Villanueva, G. L.; Liuzzi, G.; Stansberry, J. +18 more
Enceladus is a prime target in the search for life in our Solar System, having an active plume that is likely to be connected to a large liquid water sub-surface ocean. Using the sensitive near-infrared spectograph instrument on board the James Webb Space Telescope, we searched for organic compounds and characterized the plume's composition and st…
Precision cosmological constraints on atomic dark matter
Bansal, Saurabh; Barron, Jared; Curtin, David +1 more
Atomic dark matter is a simple but highly theoretically motivated possibility for an interacting dark sector that could constitute some or all of dark matter. We perform a comprehensive study of precision cosmological observables on minimal atomic dark matter, exploring for the first time the full parameter space of dark QED coupling and dark elec…
MIRI/JWST observations reveal an extremely obscured starburst in the z = 6.9 system SPT0311-58
Ilbert, O.; Güdel, M.; Colina, L. +29 more
Luminous infrared starbursts in the early Universe are thought to be the progenitors of massive quiescent galaxies identified at redshifts 2-4. Using the Mid-IRfrared Instrument (MIRI) on board the James Webb Space Telescope (JWST), we present mid-infrared sub-arcsec imaging and spectroscopy of such a starburst: the slightly lensed hyper-luminous …
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…