Search Publications
Millimeter Observations of the Type II SN 2023ixf: Constraints on the Proximate Circumstellar Medium
Rao, Ramprasad; Eftekhari, Tarraneh; Berger, Edo +10 more
We present 1.3 mm (230 GHz) observations of the recent and nearby Type II supernova, SN 2023ixf, obtained with the Submillimeter Array (SMA) at 2.6-18.6 days after explosion. The observations were obtained as part the SMA Large Program, POETS (Pursuit of Extragalactic Transients with the SMA). We do not detect any emission at the location of SN 20…
The Dusty Red Supergiant Progenitor and the Local Environment of the Type II SN 2023ixf in M101
Niu, Zexi; Sun, Ning-Chen; Liu, Jifeng +3 more
As one of the closest supernovae (SNe) in the last decade, SN 2023ixf is an unprecedented target to investigate the progenitor star that exploded. However, there is still significant uncertainty in the reported progenitor properties. In this work, we present a detailed study of SN 2023ixf's progenitor with two independent analyses. We first modele…
The Young and the Wild: What Happens to Protoclusters Forming at Redshift z ≈ 4?
Dolag, Klaus; Dannerbauer, Helmut; Remus, Rhea-Silvia
Using one of the largest volumes of the hydrodynamical cosmological simulation suit Magneticum, we study the evolution of protoclusters identified at redshift ≈ 4, with properties similar to the well-observed protocluster SPT2349-56. We identify 42 protoclusters in the simulation as massive and equally rich in substructures as observed, confirming…
Rapid Quenching of Galaxies at Cosmic Noon
Conroy, Charlie; Johnson, Benjamin D.; Belli, Sirio +6 more
The existence of massive quiescent galaxies at high redshift seems to require rapid quenching, but it is unclear whether all quiescent galaxies have gone through this phase and what physical mechanisms are involved. To study rapid quenching, we use rest-frame colors to select 12 young quiescent galaxies at z ~ 1.5. From spectral energy distributio…
The ALMA Survey of 70 µm Dark High-mass Clumps in Early Stages (ASHES). IX. Physical Properties and Spatial Distribution of Cores in IRDCs
Jackson, James M.; Sanhueza, Patricio; Lu, Xing +13 more
The initial conditions found in infrared dark clouds (IRDCs) provide insights on how high-mass stars and stellar clusters form. We have conducted high-angular resolution and high-sensitivity observations toward thirty-nine massive IRDC clumps, which have been mosaicked using the 12 and 7 m arrays from the Atacama Large Millimeter/submillimeter Arr…
Color Gradients and Half-mass Radii of Galaxies Out to z = 2 in the CANDELS/3D-HST Fields: Further Evidence for Important Differences in the Evolution of Mass-weighted and Light-weighted Sizes
Mowla, Lamiya; van Dokkum, Pieter; Miller, Tim B.
Recent studies have indicated that the ratio between half-mass and half-light radii, r mass/r light, varies significantly as a function of stellar mass and redshift, complicating the interpretation of the ubiquitous r light - M * relation. To investigate, in this study we construct the light and color pr…
The First JWST Spectral Energy Distribution of a Y Dwarf
Cushing, Michael C.; Kirkpatrick, J. Davy; Marley, Mark S. +3 more
We present the first JWST spectral energy distribution of a Y dwarf. This spectral energy distribution of the Y0 dwarf WISE J035934.06-540154.6 consists of low-resolution (λ/Δλ ~100) spectroscopy from 1-12 µm and three photometric points at 15, 18, and 21 µm. The spectrum exhibits numerous fundamental, overtone, and combination rotatio…
Nitrogen-enriched, Highly Pressurized Nebular Clouds Surrounding a Super Star Cluster at Cosmic Noon
Pascale, Massimo; Dai, Liang; McKee, Christopher F. +1 more
Strong lensing offers a precious opportunity for studying the formation and early evolution of super star clusters that are rare in our cosmic backyard. The Sunburst Arc, a lensed Cosmic Noon galaxy, hosts a young super star cluster with escaping Lyman continuum radiation. Analyzing archival Hubble Space Telescope images and emission line data fro…
The Mass-Metallicity Relation of Dwarf Galaxies at Cosmic Noon from JWST Observations
Chevallard, Jacopo; Fan, Xiaohui; Cai, Zheng +13 more
We present a study of the mass-metallicity relation (MZR) of 51 dwarf galaxies (M ⋆ ≈ 106.5-109.5 M ⊙) at z = 2-3 from the A2744 and SMACS J0723-3732 galaxy cluster fields. These dwarf galaxies are identified and confirmed by deep JWST/NIRISS imaging and slitless grism spectroscopic observations. By taki…
Paschen-line Constraints on Dust Attenuation and Star Formation at z 1-3 with JWST/NIRSpec
Shapley, Alice E.; Reddy, Naveen A.; Sanders, Ryan L. +2 more
We use medium-resolution JWST/NIRSpec observations from the Cosmic Evolution Early Release Science Survey to place the first constraints on dust attenuation and star formation based on Paschen lines for a sizable sample of 63 galaxies at redshifts z = 1.0-3.1. Our analysis indicates strong correlations between the Balmer decrement, Hα/Hβ, and line…